Takanobu Asanuma created HADOOP-15287:
-----------------------------------------
Summary: JDK9 JavaDoc build fails due to one-character underscore
identifiers in hadoop-yarn-common
Key: HADOOP-15287
URL: https://issues.apache.org/jira/browse/HADOOP-15287
Project: Hadoop Common
Issue Type: Sub-task
Components: documentation
Environment: Java 9.0.4, Applied HADOOP-12760 and HDFS-11610
Reporter: Takanobu Asanuma
Assignee: Takanobu Asanuma
{{mvn --projects hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common
javadoc:javadoc}} fails.
{noformat}
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-javadoc-plugin:3.0.0-M1:javadoc (default-cli) on
project hadoop-yarn-common: An error has occurred in Javadoc report generation:
[ERROR] Exit code: 1 -
./hadoop/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/hamlet/Hamlet.java:50:
error: as of release 9, '_' is a keyword, and may not be used as an identifier
[ERROR] public class HTML<T extends _> extends EImp<T> implements
HamletSpec.HTML {
[ERROR] ^
[ERROR]
./hadoop/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/hamlet/Hamlet.java:92:
error: as of release 9, '_' is a keyword, and may not be used as an identifier
[ERROR] return base().$href(href)._();
[ERROR] ^
...
{noformat}
FYI: https://bugs.openjdk.java.net/browse/JDK-8061549
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