HADOOP-17309. Javadoc warnings and errors are ignored in the precommit jobs

[aajisaka]

Set doclint option explicitly in maven-javadoc-plugin.

JIRA: https://issues.apache.org/jira/browse/HADOOP-17309

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 30s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
-1 ❌	test4tests	0m 0s		The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
			_ trunk Compile Tests _
+1 💚	mvninstall	29m 32s		trunk passed
+1 💚	compile	0m 21s		trunk passed with JDK Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1
+1 💚	compile	0m 22s		trunk passed with JDK Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
+1 💚	mvnsite	0m 26s		trunk passed
+1 💚	shadedclient	45m 3s		branch has no errors when building and testing our client artifacts.
+1 💚	javadoc	0m 24s		trunk passed with JDK Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1
+1 💚	javadoc	0m 23s		trunk passed with JDK Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 15s		the patch passed
+1 💚	compile	0m 12s		the patch passed with JDK Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1
+1 💚	javac	0m 12s		the patch passed
+1 💚	compile	0m 12s		the patch passed with JDK Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
+1 💚	javac	0m 12s		the patch passed
+1 💚	mvnsite	0m 15s		the patch passed
+1 💚	whitespace	0m 0s		The patch has no whitespace issues.
+1 💚	xml	0m 2s		The patch has no ill-formed XML file.
+1 💚	shadedclient	13m 54s		patch has no errors when building and testing our client artifacts.
+1 💚	javadoc	0m 18s		the patch passed with JDK Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1
+1 💚	javadoc	0m 18s		the patch passed with JDK Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
			_ Other Tests _
+1 💚	unit	0m 18s		hadoop-project in the patch passed.
+1 💚	asflicense	0m 33s		The patch does not generate ASF License warnings.
		65m 33s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2391/1/artifact/out/Dockerfile
GITHUB PR	#2391
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient xml
uname	Linux f5637a5e9c53 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / cc57eeb
Default Java	Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2391/1/testReport/
Max. process+thread count	414 (vs. ulimit of 5500)
modules	C: hadoop-project U: hadoop-project
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2391/1/console
versions	git=2.17.1 maven=3.6.0
Powered by	Apache Yetus 0.13.0-SNAPSHOT https://yetus.apache.org

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[tasanuma]

@aajisaka Thanks for working on this. I also confirmed that this PR catches javadoc warnings and errors of JDK11 on Ubuntu. +1.

[aajisaka]

Thank you @tasanuma