wesm commented on pull request #7439:
URL: https://github.com/apache/arrow/pull/7439#issuecomment-649195633


   The Java docs don't build at all
   
   ```
   + mvn -B -DskipTests -Drat.skip=true 
-Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn
 install
   [INFO] Scanning for projects...
   [INFO] 
------------------------------------------------------------------------
   [INFO] Detecting the operating system and CPU architecture
   [INFO] 
------------------------------------------------------------------------
   [INFO] os.detected.name: linux
   [INFO] os.detected.arch: x86_64
   [INFO] os.detected.version: 5.3
   [INFO] os.detected.version.major: 5
   [INFO] os.detected.version.minor: 3
   [INFO] os.detected.release: ubuntu
   [INFO] os.detected.release.version: 18.04
   [INFO] os.detected.release.like.ubuntu: true
   [INFO] os.detected.release.like.debian: true
   [INFO] os.detected.classifier: linux-x86_64
   [INFO] 
------------------------------------------------------------------------
   [INFO] Reactor Build Order:
   [INFO] 
   [INFO] Apache Arrow Java Root POM                                         
[pom]
   [INFO] Arrow Format                                                       
[jar]
   [INFO] Arrow Memory                                                       
[jar]
   [INFO] Arrow Vectors                                                      
[jar]
   [INFO] Arrow Tools                                                        
[jar]
   [INFO] Arrow JDBC Adapter                                                 
[jar]
   [INFO] Arrow Plasma Client                                                
[jar]
   [INFO] Arrow Flight Core                                                  
[jar]
   [INFO] Arrow Flight GRPC                                                  
[jar]
   [INFO] Arrow AVRO Adapter                                                 
[jar]
   [INFO] Arrow Algorithms                                                   
[jar]
   [INFO] Arrow Performance Benchmarks                                       
[jar]
   [INFO] 
   [INFO] ------------------< org.apache.arrow:arrow-java-root 
>------------------
   [INFO] Building Apache Arrow Java Root POM 1.0.0-SNAPSHOT                
[1/12]
   [INFO] --------------------------------[ pom 
]---------------------------------
   [INFO] 
   [INFO] --- apache-rat-plugin:0.13:check (rat-checks) @ arrow-java-root ---
   [INFO] RAT will not execute since it is configured to be skipped via system 
property 'rat.skip'.
   [INFO] 
   [INFO] --- maven-checkstyle-plugin:3.1.0:check (validate) @ arrow-java-root 
---
   [INFO] Starting audit...
   Audit done.
   [INFO] 
   [INFO] --- git-commit-id-plugin:2.2.2:revision (for-jars) @ arrow-java-root 
---
   [INFO] 
   [INFO] --- git-commit-id-plugin:2.2.2:revision (for-source-tarball) @ 
arrow-java-root ---
   [INFO] 
   [INFO] --- maven-remote-resources-plugin:1.5:process 
(process-resource-bundles) @ arrow-java-root ---
   [INFO] 
   [INFO] --- maven-site-plugin:3.5.1:attach-descriptor (attach-descriptor) @ 
arrow-java-root ---
   [INFO] 
   [INFO] --- maven-jar-plugin:3.0.0:test-jar (default) @ arrow-java-root ---
   [INFO] Skipping packaging of the test-jar
   [INFO] 
   [INFO] --- maven-enforcer-plugin:3.0.0-M2:enforce 
(validate_java_and_maven_version) @ arrow-java-root ---
   [INFO] 
   [INFO] --- maven-enforcer-plugin:3.0.0-M2:enforce (avoid_bad_dependencies) @ 
arrow-java-root ---
   [INFO] 
   [INFO] --- maven-dependency-plugin:3.0.1:analyze-only (analyze) @ 
arrow-java-root ---
   [INFO] Skipping pom project
   [INFO] 
   [INFO] --- maven-install-plugin:2.5.2:install (default-install) @ 
arrow-java-root ---
   [INFO] Installing /arrow/java/pom.xml to 
/root/.m2/repository/org/apache/arrow/arrow-java-root/1.0.0-SNAPSHOT/arrow-java-root-1.0.0-SNAPSHOT.pom
   [INFO] 
   [INFO] -------------------< org.apache.arrow:arrow-format 
>--------------------
   [INFO] Building Arrow Format 1.0.0-SNAPSHOT                              
[2/12]
   [INFO] --------------------------------[ jar 
]---------------------------------
   [INFO] 
   [INFO] --- apache-rat-plugin:0.13:check (rat-checks) @ arrow-format ---
   [INFO] RAT will not execute since it is configured to be skipped via system 
property 'rat.skip'.
   [INFO] 
   [INFO] --- maven-checkstyle-plugin:3.1.0:check (validate) @ arrow-format ---
   [INFO] 
   [INFO] --- git-commit-id-plugin:2.2.2:revision (for-jars) @ arrow-format ---
   [INFO] 
   [INFO] --- maven-dependency-plugin:3.0.1:copy (copy-flatc) @ arrow-format ---
   [INFO] Configured Artifact: 
com.github.icexelloss:flatc-linux-x86_64:1.9.0:exe
   [INFO] Copying flatc-linux-x86_64-1.9.0.exe to 
/arrow/java/format/target/flatc-linux-x86_64-1.9.0.exe
   [INFO] 
   [INFO] --- exec-maven-plugin:1.4.0:exec (script-chmod) @ arrow-format ---
   [INFO] 
   [INFO] --- exec-maven-plugin:1.4.0:exec (default) @ arrow-format ---
   [INFO] 
   [INFO] --- build-helper-maven-plugin:1.9.1:add-source 
(add-generated-sources-to-classpath) @ arrow-format ---
   [INFO] Source directory: /arrow/java/format/target/generated-sources/flatc 
added.
   [INFO] 
   [INFO] --- license-maven-plugin:2.3:format (default) @ arrow-format ---
   [INFO] Updating license headers...
   [INFO] 
   [INFO] --- maven-remote-resources-plugin:1.5:process 
(process-resource-bundles) @ arrow-format ---
   [INFO] 
   [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ 
arrow-format ---
   [INFO] Using 'UTF-8' encoding to copy filtered resources.
   [INFO] skip non existing resourceDirectory 
/arrow/java/format/src/main/resources
   [INFO] Copying 3 resources
   [INFO] 
   [INFO] --- maven-compiler-plugin:3.6.2:compile (default-compile) @ 
arrow-format ---
   [INFO] Compiling 53 source files to /arrow/java/format/target/classes
   [INFO] 
   [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) 
@ arrow-format ---
   [INFO] Using 'UTF-8' encoding to copy filtered resources.
   [INFO] skip non existing resourceDirectory 
/arrow/java/format/src/test/resources
   [INFO] Copying 3 resources
   [INFO] 
   [INFO] --- maven-compiler-plugin:3.6.2:testCompile (default-testCompile) @ 
arrow-format ---
   [INFO] No sources to compile
   [INFO] 
   [INFO] --- maven-surefire-plugin:3.0.0-M3:test (default-test) @ arrow-format 
---
   [INFO] Tests are skipped.
   [INFO] 
   [INFO] --- maven-jar-plugin:3.0.0:jar (default-jar) @ arrow-format ---
   [INFO] Building jar: 
/arrow/java/format/target/arrow-format-1.0.0-SNAPSHOT.jar
   [INFO] 
   [INFO] --- maven-site-plugin:3.5.1:attach-descriptor (attach-descriptor) @ 
arrow-format ---
   [INFO] 
   [INFO] --- maven-jar-plugin:3.0.0:test-jar (default) @ arrow-format ---
   [INFO] Building jar: 
/arrow/java/format/target/arrow-format-1.0.0-SNAPSHOT-tests.jar
   [INFO] 
   [INFO] --- maven-enforcer-plugin:3.0.0-M2:enforce (avoid_bad_dependencies) @ 
arrow-format ---
   [INFO] 
   [INFO] --- maven-dependency-plugin:3.0.1:analyze-only (analyze) @ 
arrow-format ---
   [INFO] No dependency problems found
   [INFO] 
   [INFO] --- maven-install-plugin:2.5.2:install (default-install) @ 
arrow-format ---
   [INFO] Installing /arrow/java/format/target/arrow-format-1.0.0-SNAPSHOT.jar 
to 
/root/.m2/repository/org/apache/arrow/arrow-format/1.0.0-SNAPSHOT/arrow-format-1.0.0-SNAPSHOT.jar
   [INFO] Installing /arrow/java/format/pom.xml to 
/root/.m2/repository/org/apache/arrow/arrow-format/1.0.0-SNAPSHOT/arrow-format-1.0.0-SNAPSHOT.pom
   [INFO] Installing 
/arrow/java/format/target/arrow-format-1.0.0-SNAPSHOT-tests.jar to 
/root/.m2/repository/org/apache/arrow/arrow-format/1.0.0-SNAPSHOT/arrow-format-1.0.0-SNAPSHOT-tests.jar
   [INFO] 
   [INFO] -------------------< org.apache.arrow:arrow-memory 
>--------------------
   [INFO] Building Arrow Memory 1.0.0-SNAPSHOT                              
[3/12]
   [INFO] --------------------------------[ jar 
]---------------------------------
   [INFO] 
   [INFO] --- apache-rat-plugin:0.13:check (rat-checks) @ arrow-memory ---
   [INFO] RAT will not execute since it is configured to be skipped via system 
property 'rat.skip'.
   [INFO] 
   [INFO] --- maven-checkstyle-plugin:3.1.0:check (validate) @ arrow-memory ---
   [INFO] Starting audit...
   Audit done.
   [INFO] 
   [INFO] --- git-commit-id-plugin:2.2.2:revision (for-jars) @ arrow-memory ---
   [INFO] 
   [INFO] --- maven-remote-resources-plugin:1.5:process 
(process-resource-bundles) @ arrow-memory ---
   [INFO] 
   [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ 
arrow-memory ---
   [INFO] Using 'UTF-8' encoding to copy filtered resources.
   [INFO] skip non existing resourceDirectory 
/arrow/java/memory/src/main/resources
   [INFO] Copying 3 resources
   [INFO] 
   [INFO] --- maven-compiler-plugin:3.6.2:compile (default-compile) @ 
arrow-memory ---
   [INFO] Compiling 30 source files to /arrow/java/memory/target/classes
   [INFO] 
   [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) 
@ arrow-memory ---
   [INFO] Using 'UTF-8' encoding to copy filtered resources.
   [INFO] Copying 1 resource
   [INFO] Copying 3 resources
   [INFO] 
   [INFO] --- maven-compiler-plugin:3.6.2:testCompile (default-testCompile) @ 
arrow-memory ---
   [INFO] Compiling 11 source files to /arrow/java/memory/target/test-classes
   [INFO] 
   [INFO] --- maven-surefire-plugin:3.0.0-M3:test (default-test) @ arrow-memory 
---
   [INFO] Tests are skipped.
   [INFO] 
   [INFO] --- maven-jar-plugin:3.0.0:jar (default-jar) @ arrow-memory ---
   [INFO] Building jar: 
/arrow/java/memory/target/arrow-memory-1.0.0-SNAPSHOT.jar
   [INFO] 
   [INFO] --- maven-site-plugin:3.5.1:attach-descriptor (attach-descriptor) @ 
arrow-memory ---
   [INFO] 
   [INFO] --- maven-jar-plugin:3.0.0:test-jar (default) @ arrow-memory ---
   [INFO] Building jar: 
/arrow/java/memory/target/arrow-memory-1.0.0-SNAPSHOT-tests.jar
   [INFO] 
   [INFO] --- maven-enforcer-plugin:3.0.0-M2:enforce (avoid_bad_dependencies) @ 
arrow-memory ---
   [INFO] 
   [INFO] --- maven-dependency-plugin:3.0.1:analyze-only (analyze) @ 
arrow-memory ---
   [INFO] No dependency problems found
   [INFO] 
   [INFO] --- maven-install-plugin:2.5.2:install (default-install) @ 
arrow-memory ---
   [INFO] Installing /arrow/java/memory/target/arrow-memory-1.0.0-SNAPSHOT.jar 
to 
/root/.m2/repository/org/apache/arrow/arrow-memory/1.0.0-SNAPSHOT/arrow-memory-1.0.0-SNAPSHOT.jar
   [INFO] Installing /arrow/java/memory/pom.xml to 
/root/.m2/repository/org/apache/arrow/arrow-memory/1.0.0-SNAPSHOT/arrow-memory-1.0.0-SNAPSHOT.pom
   [INFO] Installing 
/arrow/java/memory/target/arrow-memory-1.0.0-SNAPSHOT-tests.jar to 
/root/.m2/repository/org/apache/arrow/arrow-memory/1.0.0-SNAPSHOT/arrow-memory-1.0.0-SNAPSHOT-tests.jar
   [INFO] 
   [INFO] -------------------< org.apache.arrow:arrow-vector 
>--------------------
   [INFO] Building Arrow Vectors 1.0.0-SNAPSHOT                             
[4/12]
   [INFO] --------------------------------[ jar 
]---------------------------------
   [INFO] 
   [INFO] --- apache-rat-plugin:0.13:check (rat-checks) @ arrow-vector ---
   [INFO] RAT will not execute since it is configured to be skipped via system 
property 'rat.skip'.
   [INFO] 
   [INFO] --- maven-checkstyle-plugin:3.1.0:check (validate) @ arrow-vector ---
   [INFO] Starting audit...
   Audit done.
   [INFO] 
   [INFO] --- maven-resources-plugin:2.6:copy-resources (copy-fmpp-resources) @ 
arrow-vector ---
   [INFO] Using 'UTF-8' encoding to copy filtered resources.
   [INFO] Copying 28 resources
   [INFO] 
   [INFO] --- git-commit-id-plugin:2.2.2:revision (for-jars) @ arrow-vector ---
   [INFO] 
   [INFO] --- drill-fmpp-maven-plugin:1.5.0:generate (generate-fmpp) @ 
arrow-vector ---
   [INFO] Freemarker generation:
    scope: compile,
    config: /arrow/java/vector/src/main/codegen/config.fmpp,
    templates: /arrow/java/vector/target/codegen/templates
   .......................
   [INFO] Freemarker generation took 438ms
   [INFO] 
org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/impl/DenseUnionWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/impl/UnionWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/impl/AbstractFieldReader.java has 
changed
   [INFO] org/apache/arrow/vector/complex/impl/NullReader.java has changed
   [INFO] org/apache/arrow/vector/complex/impl/UnionMapWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/impl/DecimalWriterImpl.java has 
changed
   [INFO] org/apache/arrow/vector/complex/impl/DenseUnionReader.java has changed
   [INFO] org/apache/arrow/vector/complex/impl/ComplexCopier.java has changed
   [INFO] org/apache/arrow/vector/complex/impl/UnionReader.java has changed
   [INFO] org/apache/arrow/vector/complex/impl/UnionFixedSizeListWriter.java 
has changed
   [INFO] org/apache/arrow/vector/complex/impl/SingleStructWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/impl/NullableStructWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/impl/UnionListWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/DenseUnionVector.java has changed
   [INFO] org/apache/arrow/vector/complex/UnionVector.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/BaseWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/IntWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/UInt8Writer.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/TimeStampSecTZWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/writer/TimeStampSecWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/writer/TimeNanoWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/TimeStampMilliTZWriter.java 
has changed
   [INFO] org/apache/arrow/vector/complex/writer/DateMilliWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/writer/IntervalYearWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/writer/TimeStampMilliWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/writer/VarBinaryWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/writer/TimeSecWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/SmallIntWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/DateDayWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/IntervalDayWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/writer/TimeMicroWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/writer/TimeStampMicroWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/writer/FixedSizeBinaryWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/writer/DecimalWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/BitWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/TimeMilliWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/writer/BigIntWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/UInt1Writer.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/Float8Writer.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/VarCharWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/UInt4Writer.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/DurationWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/Float4Writer.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/TimeStampNanoTZWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/writer/TinyIntWriter.java has changed
   [INFO] org/apache/arrow/vector/complex/writer/TimeStampMicroTZWriter.java 
has changed
   [INFO] org/apache/arrow/vector/complex/writer/TimeStampNanoWriter.java has 
changed
   [INFO] org/apache/arrow/vector/complex/writer/UInt2Writer.java has changed
   [INFO] org/apache/arrow/vector/complex/reader/BaseReader.java has changed
   [INFO] org/apache/arrow/vector/types/pojo/ArrowType.java has changed
   [INFO] Incremental output update took 0ms
   [INFO] new: 16
   [INFO] changed: 52
   [INFO] unchanged: 225
   [INFO] 
   [INFO] --- maven-remote-resources-plugin:1.5:process 
(process-resource-bundles) @ arrow-vector ---
   [INFO] 
   [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ 
arrow-vector ---
   [INFO] Using 'UTF-8' encoding to copy filtered resources.
   [INFO] Copying 28 resources to codegen
   [INFO] Copying 3 resources
   [INFO] 
   [INFO] --- maven-compiler-plugin:3.6.2:compile (default-compile) @ 
arrow-vector ---
   [INFO] Compiling 168 source files to /arrow/java/vector/target/classes
   [INFO] -------------------------------------------------------------
   [ERROR] COMPILATION ERROR : 
   [INFO] -------------------------------------------------------------
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[108,10]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[109,10]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[110,10]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[194,62]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[219,14]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[289,9]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[292,9]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[294,9]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[297,9]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[1193,9]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/holders/NullableLargeVarBinaryHolder.java:[78,11]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/holders/NullableLargeVarCharHolder.java:[78,11]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/DenseUnionWriter.java:[787,38]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/DenseUnionWriter.java:[812,49]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/DenseUnionWriter.java:[837,47]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/DenseUnionWriter.java:[862,54]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/DenseUnionWriter.java:[887,56]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/holders/LargeVarBinaryHolder.java:[77,11]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/holders/LargeVarCharHolder.java:[77,11]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/writer/DecimalWriter.java:[73,38]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/writer/DecimalWriter.java:[75,38]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/writer/FixedSizeBinaryWriter.java:[73,35]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/writer/VarBinaryWriter.java:[73,49]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/writer/VarCharWriter.java:[73,47]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/writer/LargeVarCharWriter.java:[73,54]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/writer/LargeVarBinaryWriter.java:[73,56]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java:[382,38]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java:[390,38]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java:[407,35]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java:[417,49]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java:[427,47]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java:[437,54]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java:[447,56]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionWriter.java:[905,38]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionWriter.java:[947,49]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionWriter.java:[977,47]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionWriter.java:[1007,54]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionWriter.java:[1037,56]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionListWriter.java:[498,38]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionListWriter.java:[503,38]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionListWriter.java:[761,49]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionListWriter.java:[772,47]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionListWriter.java:[783,54]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionListWriter.java:[794,56]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java:[386,38]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java:[390,38]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java:[407,35]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java:[417,49]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java:[427,47]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java:[437,54]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java:[447,56]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionFixedSizeListWriter.java:[504,38]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionFixedSizeListWriter.java:[903,49]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionFixedSizeListWriter.java:[920,47]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionFixedSizeListWriter.java:[937,54]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionFixedSizeListWriter.java:[954,56]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/LargeVarCharWriterImpl.java:[119,54]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/LargeVarBinaryWriterImpl.java:[119,56]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/DecimalWriterImpl.java:[126,38]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/DecimalWriterImpl.java:[131,38]
 error: reference to ArrowBuf is ambiguous
     both class org.apache.arrow.memory.ArrowBuf in org.apache.arrow.memory and 
class io.netty.buffer.ArrowBuf in io.netty.buffer match
   [INFO] 60 errors 
   [INFO] -------------------------------------------------------------
   [INFO] 
------------------------------------------------------------------------
   [INFO] Reactor Summary:
   [INFO] 
   [INFO] Apache Arrow Java Root POM 1.0.0-SNAPSHOT .......... SUCCESS [ 23.231 
s]
   [INFO] Arrow Format ....................................... SUCCESS [  9.738 
s]
   [INFO] Arrow Memory ....................................... SUCCESS [  9.486 
s]
   [INFO] Arrow Vectors ...................................... FAILURE [ 11.120 
s]
   [INFO] Arrow Tools ........................................ SKIPPED
   [INFO] Arrow JDBC Adapter ................................. SKIPPED
   [INFO] Arrow Plasma Client ................................ SKIPPED
   [INFO] Arrow Flight Core .................................. SKIPPED
   [INFO] Arrow Flight GRPC .................................. SKIPPED
   [INFO] Arrow AVRO Adapter ................................. SKIPPED
   [INFO] Arrow Algorithms ................................... SKIPPED
   [INFO] Arrow Performance Benchmarks 1.0.0-SNAPSHOT ........ SKIPPED
   [INFO] 
------------------------------------------------------------------------
   [INFO] BUILD FAILURE
   [INFO] 
------------------------------------------------------------------------
   [INFO] Total time: 55.823 s
   [INFO] Finished at: 2020-06-25T03:32:57Z
   [INFO] 
------------------------------------------------------------------------
   [ERROR] Failed to execute goal 
org.apache.maven.plugins:maven-compiler-plugin:3.6.2:compile (default-compile) 
on project arrow-vector: Compilation failure: Compilation failure: 
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[108,10]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[109,10]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[110,10]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[194,62]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[219,14]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[289,9]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[292,9]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[294,9]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[297,9]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/DenseUnionVector.java:[1193,9]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/holders/NullableLargeVarBinaryHolder.java:[78,11]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/holders/NullableLargeVarCharHolder.java:[78,11]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/DenseUnionWriter.java:[787,38]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/DenseUnionWriter.java:[812,49]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/DenseUnionWriter.java:[837,47]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/DenseUnionWriter.java:[862,54]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/DenseUnionWriter.java:[887,56]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/holders/LargeVarBinaryHolder.java:[77,11]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/holders/LargeVarCharHolder.java:[77,11]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/writer/DecimalWriter.java:[73,38]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/writer/DecimalWriter.java:[75,38]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/writer/FixedSizeBinaryWriter.java:[73,35]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/writer/VarBinaryWriter.java:[73,49]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/writer/VarCharWriter.java:[73,47]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/writer/LargeVarCharWriter.java:[73,54]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/writer/LargeVarBinaryWriter.java:[73,56]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java:[382,38]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java:[390,38]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java:[407,35]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java:[417,49]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java:[427,47]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java:[437,54]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractFieldWriter.java:[447,56]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionWriter.java:[905,38]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionWriter.java:[947,49]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionWriter.java:[977,47]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionWriter.java:[1007,54]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionWriter.java:[1037,56]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionListWriter.java:[498,38]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionListWriter.java:[503,38]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionListWriter.java:[761,49]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionListWriter.java:[772,47]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionListWriter.java:[783,54]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionListWriter.java:[794,56]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java:[386,38]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java:[390,38]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java:[407,35]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java:[417,49]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java:[427,47]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java:[437,54]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/AbstractPromotableFieldWriter.java:[447,56]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionFixedSizeListWriter.java:[504,38]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionFixedSizeListWriter.java:[903,49]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionFixedSizeListWriter.java:[920,47]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionFixedSizeListWriter.java:[937,54]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/UnionFixedSizeListWriter.java:[954,56]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/LargeVarCharWriterImpl.java:[119,54]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/LargeVarBinaryWriterImpl.java:[119,56]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/DecimalWriterImpl.java:[126,38]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] 
/arrow/java/vector/target/generated-sources/org/apache/arrow/vector/complex/impl/DecimalWriterImpl.java:[131,38]
 error: reference to ArrowBuf is ambiguous
   [ERROR]   both class org.apache.arrow.memory.ArrowBuf in 
org.apache.arrow.memory and class io.netty.buffer.ArrowBuf in io.netty.buffer 
match
   [ERROR] -> [Help 1]
   [ERROR] 
   [ERROR] To see the full stack trace of the errors, re-run Maven with the -e 
switch.
   [ERROR] Re-run Maven using the -X switch to enable full debug logging.
   [ERROR] 
   [ERROR] For more information about the errors and possible solutions, please 
read the following articles:
   [ERROR] [Help 1] 
http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
   [ERROR] 
   [ERROR] After correcting the problems, you can resume the build with the 
command
   [ERROR]   mvn <goals> -rf :arrow-vector
   Error: docker run --rm -it --gpus all -e ARROW_CUDA=ON -e 
ARROW_GLIB_GTK_DOC=true -e CCACHE_COMPILERCHECK=content -e CCACHE_COMPRESS=1 -e 
CCACHE_COMPRESSLEVEL=6 -e CCACHE_DIR=/ccache -e CCACHE_MAXSIZE=500M -v 
/home/wesm/code/arrow:/arrow:delegated -v 
/home/wesm/code/arrow/.docker/amd64-ubuntu-18.04-ccache:/ccache:delegated 
apache/arrow-dev:amd64-ubuntu-18.04-cuda-9.1-python-3-docs /bin/bash -c  
/arrow/ci/scripts/cpp_build.sh /arrow /build true && 
/arrow/ci/scripts/c_glib_build.sh /arrow /build && 
/arrow/ci/scripts/python_build.sh /arrow /build && 
/arrow/ci/scripts/java_build.sh /arrow /build true && 
/arrow/ci/scripts/js_build.sh /arrow true && /arrow/ci/scripts/r_build.sh 
/arrow true && /arrow/ci/scripts/docs_build.sh /arrow /build exited with 
non-zero exit code 1
   ```
   
   +1. Please open a JIRA so we can get this to build cleanly on master


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