See 
https://ci-maven.apache.org/job/Maven/job/maven-box/job/maven/job/master/205/

Changes:

* Warn also on Windows when JAVA_HOME isn't set

No tests ran.

Build log:
[...truncated 5531 lines...]
[INFO] Finished adding exclusions from SCM ignore files.
[INFO] 62 implicit excludes (use -debug for more details).
[INFO] 19 explicit excludes (use -debug for more details).
[INFO] 16 resources included (use -debug for more details)
[INFO] Rat check: Summary over all files. Unapproved: 0, unknown: 0, generated: 
0, approved: 16 licenses.
[INFO] 
[INFO] --- maven-remote-resources-plugin:1.7.0:process 
(process-resource-bundles) @ maven-wrapper ---
[INFO] Preparing remote bundle org.apache:apache-jar-resource-bundle:1.4
[INFO] Copying 3 resources from 1 bundle.
[INFO] 
[INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) @ 
maven-wrapper ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/maven-wrapper/src/main/resources
[INFO] Copying 3 resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ 
maven-wrapper ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 9 source files to 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/maven-wrapper/target/classes
[INFO] 
[INFO] --- animal-sniffer-maven-plugin:1.18:check (check-java-compat) @ 
maven-wrapper ---
[INFO] Checking unresolved references to org.codehaus.mojo.signature:java18:1.0
[INFO] 
[INFO] --- maven-resources-plugin:3.1.0:testResources (default-testResources) @ 
maven-wrapper ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 3 resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.8.1:testCompile (default-testCompile) @ 
maven-wrapper ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 4 source files to 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/maven-wrapper/target/test-classes
[INFO] 
[INFO] --- maven-surefire-plugin:2.22.0:test (default-test) @ maven-wrapper ---
[INFO] Surefire report directory: 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/maven-wrapper/target/surefire-reports
[INFO] 
[INFO] -------------------------------------------------------
[INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO] Running org.apache.maven.wrapper.InstallerTest
[WARNING] Tests run: 4, Failures: 0, Errors: 0, Skipped: 1, Time elapsed: 0.512 
s - in org.apache.maven.wrapper.InstallerTest
[INFO] Running org.apache.maven.wrapper.PathAssemblerTest
[INFO] Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.013 s 
- in org.apache.maven.wrapper.PathAssemblerTest
[INFO] Running org.apache.maven.wrapper.WrapperExecutorTest
[INFO] Tests run: 8, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.059 s 
- in org.apache.maven.wrapper.WrapperExecutorTest
[INFO] Running org.apache.maven.wrapper.DownloaderTest
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.003 s 
- in org.apache.maven.wrapper.DownloaderTest
[INFO] 
[INFO] Results:
[INFO] 
[WARNING] Tests run: 18, Failures: 0, Errors: 0, Skipped: 1
[INFO] 
[INFO] 
[INFO] --- maven-jar-plugin:3.2.0:jar (default-jar) @ maven-wrapper ---
[INFO] Building jar: 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/maven-wrapper/target/maven-wrapper.jar
[INFO] 
[INFO] --- maven-site-plugin:3.7.1:attach-descriptor (attach-descriptor) @ 
maven-wrapper ---
[INFO] Skipping because packaging 'jar' is not pom.
[INFO] 
[INFO] --- maven-checkstyle-plugin:3.1.2:check (checkstyle-check) @ 
maven-wrapper ---
[INFO] You have 0 Checkstyle violations.
[INFO] 
[INFO] --- maven-install-plugin:2.5.2:install (default-install) @ maven-wrapper 
---
[INFO] Installing 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/maven-wrapper/target/maven-wrapper.jar
 to 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/.repository/org/apache/maven/maven-wrapper/4.0.0-alpha-1-SNAPSHOT/maven-wrapper-4.0.0-alpha-1-SNAPSHOT.jar
[INFO] Installing 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/maven-wrapper/pom.xml
 to 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/.repository/org/apache/maven/maven-wrapper/4.0.0-alpha-1-SNAPSHOT/maven-wrapper-4.0.0-alpha-1-SNAPSHOT.pom
[INFO] 
[INFO] --- maven-deploy-plugin:2.8.2:deploy (default-deploy) @ maven-wrapper ---
[INFO] Downloading from apache.snapshots.https: 
https://repository.apache.org/content/repositories/snapshots/org/apache/maven/maven-wrapper/4.0.0-alpha-1-SNAPSHOT/maven-metadata.xml
[INFO] Downloaded from apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
https://repository.apache.org/content/repositories/snapshots/org/apache/maven/maven-wrapper/4.0.0-alpha-1-SNAPSHOT/maven-wrapper-4.0.0-alpha-1-20210723.190905-141.jar
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[INFO] Uploading to apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
https://repository.apache.org/content/repositories/snapshots/org/apache/maven/maven-wrapper/4.0.0-alpha-1-SNAPSHOT/maven-wrapper-4.0.0-alpha-1-20210723.190905-141.pom
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[INFO] Downloading from apache.snapshots.https: 
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[INFO] Downloaded from apache.snapshots.https: 
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[INFO] Uploading to apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
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[INFO] Uploading to apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
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[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[INFO] 
[INFO] ---------------< org.apache.maven:apache-maven-wrapper >----------------
[INFO] Building Apache Maven Wrapper Distribution 4.0.0-alpha-1-SNAPSHOT [20/20]
[INFO] --------------------------------[ pom ]---------------------------------
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[INFO] 
[INFO] --- maven-enforcer-plugin:1.4.1:enforce (enforce-maven-version) @ 
apache-maven-wrapper ---
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[INFO] 
[INFO] --- maven-enforcer-plugin:1.4.1:enforce (enforce-bytecode-version) @ 
apache-maven-wrapper ---
[INFO] Adding ignore: module-info
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[INFO] 
[INFO] --- maven-enforcer-plugin:1.4.1:enforce 
(ensure-no-org.sonatype:plexus-cipher) @ apache-maven-wrapper ---
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[INFO] 
[INFO] --- apache-rat-plugin:0.13:check (rat-check) @ apache-maven-wrapper ---
[INFO] Enabled default license matchers.
[INFO] Will parse SCM ignores for exclusions...
[INFO] Finished adding exclusions from SCM ignore files.
[INFO] 62 implicit excludes (use -debug for more details).
[INFO] 32 explicit excludes (use -debug for more details).
[INFO] 29 resources included (use -debug for more details)
[INFO] Rat check: Summary over all files. Unapproved: 0, unknown: 0, generated: 
0, approved: 27 licenses.
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[INFO] 
[INFO] --- maven-remote-resources-plugin:1.7.0:process 
(process-resource-bundles) @ apache-maven-wrapper ---
[INFO] Preparing remote bundle org.apache:apache-jar-resource-bundle:1.4
[INFO] Copying 3 resources from 1 bundle.
[INFO] Filtering appended resource: META-INF/NOTICE.vm
[INFO] Filtering appended resource: META-INF/LICENSE.vm
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[INFO] 
[INFO] --- animal-sniffer-maven-plugin:1.18:check (check-java-compat) @ 
apache-maven-wrapper ---
[INFO] Checking unresolved references to org.codehaus.mojo.signature:java18:1.0
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[INFO] 
[INFO] --- maven-site-plugin:3.7.1:attach-descriptor (attach-descriptor) @ 
apache-maven-wrapper ---
[INFO] Attaching 'src/site/site.xml' site descriptor with classifier 'site'.
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[INFO] 
[INFO] --- maven-assembly-plugin:3.3.0:single (default) @ apache-maven-wrapper 
---
[INFO] Reading assembly descriptor: src/assembly/wrapper/script.xml
[INFO] Reading assembly descriptor: src/assembly/wrapper/bin.xml
[INFO] Reading assembly descriptor: src/assembly/wrapper/source.xml
[INFO] Building tar: 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/apache-maven/target/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-script.tar.gz
[INFO] Building zip: 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/apache-maven/target/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-script.zip
[INFO] Building tar: 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/apache-maven/target/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-bin.tar.gz
[INFO] Building zip: 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/apache-maven/target/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-bin.zip
[INFO] Building tar: 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/apache-maven/target/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-source.tar.gz
[INFO] Building zip: 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/apache-maven/target/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-source.zip
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[INFO] 
[INFO] --- maven-checkstyle-plugin:3.1.2:check (checkstyle-check) @ 
apache-maven-wrapper ---
[INFO] You have 0 Checkstyle violations.
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[INFO] 
[INFO] --- maven-install-plugin:2.5.2:install (default-install) @ 
apache-maven-wrapper ---
[INFO] Installing 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/apache-maven/maven-wrapper.pom
 to 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/.repository/org/apache/maven/apache-maven-wrapper/4.0.0-alpha-1-SNAPSHOT/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT.pom
[INFO] Installing 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/apache-maven/target/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-site.xml
 to 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/.repository/org/apache/maven/apache-maven-wrapper/4.0.0-alpha-1-SNAPSHOT/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-site.xml
[INFO] Installing 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/apache-maven/target/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-script.tar.gz
 to 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/.repository/org/apache/maven/apache-maven-wrapper/4.0.0-alpha-1-SNAPSHOT/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-script.tar.gz
[INFO] Installing 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/apache-maven/target/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-script.zip
 to 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/.repository/org/apache/maven/apache-maven-wrapper/4.0.0-alpha-1-SNAPSHOT/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-script.zip
[INFO] Installing 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/apache-maven/target/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-bin.tar.gz
 to 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/.repository/org/apache/maven/apache-maven-wrapper/4.0.0-alpha-1-SNAPSHOT/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-bin.tar.gz
[INFO] Installing 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/apache-maven/target/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-bin.zip
 to 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/.repository/org/apache/maven/apache-maven-wrapper/4.0.0-alpha-1-SNAPSHOT/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-bin.zip
[INFO] Installing 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/apache-maven/target/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-source.tar.gz
 to 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/.repository/org/apache/maven/apache-maven-wrapper/4.0.0-alpha-1-SNAPSHOT/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-source.tar.gz
[INFO] Installing 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/apache-maven/target/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-source.zip
 to 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build/.repository/org/apache/maven/apache-maven-wrapper/4.0.0-alpha-1-SNAPSHOT/apache-maven-wrapper-4.0.0-alpha-1-SNAPSHOT-source.zip
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[INFO] 
[INFO] --- maven-deploy-plugin:2.8.2:deploy (default-deploy) @ 
apache-maven-wrapper ---
[INFO] Downloading from apache.snapshots.https: 
https://repository.apache.org/content/repositories/snapshots/org/apache/maven/apache-maven-wrapper/4.0.0-alpha-1-SNAPSHOT/maven-metadata.xml
[INFO] Downloaded from apache.snapshots.https: 
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[INFO] Uploading to apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
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[INFO] Uploading to apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
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[INFO] Uploading to apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
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[INFO] Uploading to apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
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[INFO] Uploading to apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
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[INFO] Uploading to apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
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[INFO] Uploading to apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
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[INFO] Uploading to apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
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[INFO] Uploading to apache.snapshots.https: 
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[INFO] Uploaded to apache.snapshots.https: 
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[INFO] Uploading to apache.snapshots.https: 
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[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for Apache Maven 4.0.0-alpha-1-SNAPSHOT:
[INFO] 
[INFO] Maven Dependencies BOM ............................. SUCCESS [ 11.466 s]
[INFO] Apache Maven ....................................... SUCCESS [  5.657 s]
[INFO] Maven Model ........................................ SUCCESS [  9.200 s]
[INFO] Maven Artifact ..................................... SUCCESS [  6.588 s]
[INFO] Maven Plugin API ................................... SUCCESS [  6.481 s]
[INFO] Maven Builder Support .............................. SUCCESS [  4.741 s]
[INFO] Maven Model XML Transform .......................... SUCCESS [  6.038 s]
[INFO] Maven Model Builder ................................ SUCCESS [  8.943 s]
[INFO] Maven Settings ..................................... SUCCESS [  3.956 s]
[INFO] Maven Settings Builder ............................. SUCCESS [  5.067 s]
[INFO] Maven Repository Metadata Model .................... SUCCESS [  8.059 s]
[INFO] Maven Artifact Resolver Provider ................... SUCCESS [  8.200 s]
[INFO] Maven Core ......................................... SUCCESS [ 26.615 s]
[INFO] Maven SLF4J Wrapper ................................ SUCCESS [  4.359 s]
[INFO] Maven SLF4J Simple Provider ........................ SUCCESS [  5.043 s]
[INFO] Maven Embedder ..................................... SUCCESS [  8.320 s]
[INFO] Maven Compat ....................................... SUCCESS [ 15.696 s]
[INFO] Apache Maven Distribution .......................... SUCCESS [ 14.916 s]
[INFO] Maven Wrapper ...................................... SUCCESS [  5.580 s]
[INFO] Apache Maven Wrapper Distribution .................. SUCCESS [ 16.810 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  03:02 min
[INFO] Finished at: 2021-07-23T19:09:25Z
[INFO] ------------------------------------------------------------------------
[WARNING] [jenkins-event-spy] Unexpected Maven project file name 
'maven-wrapper.pom', problems may occur
[INFO] [jenkins-event-spy] Generated 
/home/jenkins/jenkins-home/workspace/Maven_maven-box_maven_master/build@tmp/withMaven843956a5/maven-spy-20210723-190623-126382494310247422207.log
[Pipeline] }
[Pipeline] // withMaven
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // dir
[Pipeline] }
[Pipeline] // node
[Pipeline] echo
[FAILURE-001] hudson.remoting.ChannelClosedException: Channel 
"hudson.remoting.Channel@4c2e0fa7:maven6": Remote call on maven6 failed. The 
channel is closing down or has closed down
[Pipeline] stage
[Pipeline] { (Notifications)
[Pipeline] echo
Build result: FAILURE
[Pipeline] jiraIssueSelector
[Pipeline] echo
The authors of changes [michaelo].
[Pipeline] echo
Sending email ...
[Pipeline] emailext

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