[HADOOP-15287] JDK9 JavaDoc build fails due to one-character underscore identifiers in hadoop-yarn-common

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.1.0
• Component/s: documentation

Environment

Java 9.0.4, Applied HADOOP-12760 and HDFS-11610

• Hadoop Flags: Reviewed
• Assignee: Takanobu Asanuma
• Reporter: Takanobu Asanuma
• Created: 05/Mar/18 07:54
• Updated: 19/Mar/18 18:32
• Resolved: 06/Mar/18 02:16

Description

mvn --projects hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common javadoc:javadoc fails.

[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]                                 ^
...

FYI: https://bugs.openjdk.java.net/browse/JDK-8061549

Issue Links

• relates to: HADOOP-11875 [JDK9] Add a second copy of Hamlet without _ as a one-character identifier