HADOOP-19930. ObjectWritable to validate class on load (#8640)

[steveloughran]

Description of PR

cherrypick of #8640

For code changes:

• Does the title of this PR start with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: Have the integration tests been executed and the endpoint
  declared according to the connector-specific documentation? Note: Automated CI
  testing doesn't cover all cases so manual testing with cloud storage is still
  required.
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

AI Tooling

If an AI tool was used:

• The PR includes the phrase "Contains content generated by "
  where is the name of the AI tool used.
• My use of AI contributions follows the ASF legal policy
  https://www.apache.org/legal/generative-tooling.html

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	7m 27s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 6 new or modified test files.
			_ branch-3.4 Compile Tests _
+0 🆗	mvndep	8m 20s		Maven dependency ordering for branch
+1 💚	mvninstall	23m 26s		branch-3.4 passed
+1 💚	compile	8m 49s		branch-3.4 passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	compile	8m 2s		branch-3.4 passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	checkstyle	2m 3s		branch-3.4 passed
+1 💚	mvnsite	2m 5s		branch-3.4 passed
+1 💚	javadoc	1m 49s		branch-3.4 passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	2m 9s		branch-3.4 passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	spotbugs	3m 3s		branch-3.4 passed
+1 💚	shadedclient	20m 20s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 23s		Maven dependency ordering for patch
-1 ❌	mvninstall	0m 17s	/patch-mvninstall-hadoop-common-project_hadoop-common.txt	hadoop-common in the patch failed.
-1 ❌	mvninstall	0m 17s	/patch-mvninstall-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt	hadoop-mapreduce-client-core in the patch failed.
-1 ❌	mvninstall	0m 12s	/patch-mvninstall-hadoop-tools_hadoop-federation-balance.txt	hadoop-federation-balance in the patch failed.
-1 ❌	compile	0m 24s	/patch-compile-root-jdkUbuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.txt	root in the patch failed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.
-1 ❌	javac	0m 24s	/patch-compile-root-jdkUbuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.txt	root in the patch failed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.
-1 ❌	compile	0m 24s	/patch-compile-root-jdkPrivateBuild-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.txt	root in the patch failed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.
-1 ❌	javac	0m 24s	/patch-compile-root-jdkPrivateBuild-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.txt	root in the patch failed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	0m 18s	/buildtool-patch-checkstyle-root.txt	The patch fails to run checkstyle in root
-1 ❌	mvnsite	0m 20s	/patch-mvnsite-hadoop-common-project_hadoop-common.txt	hadoop-common in the patch failed.
-1 ❌	mvnsite	0m 19s	/patch-mvnsite-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt	hadoop-mapreduce-client-core in the patch failed.
-1 ❌	mvnsite	0m 14s	/patch-mvnsite-hadoop-tools_hadoop-federation-balance.txt	hadoop-federation-balance in the patch failed.
-1 ❌	javadoc	0m 19s	/patch-javadoc-hadoop-common-project_hadoop-common-jdkUbuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.txt	hadoop-common in the patch failed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.
-1 ❌	javadoc	0m 16s	/patch-javadoc-hadoop-common-project_hadoop-common-jdkPrivateBuild-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.txt	hadoop-common in the patch failed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.
-1 ❌	spotbugs	0m 18s	/patch-spotbugs-hadoop-common-project_hadoop-common.txt	hadoop-common in the patch failed.
-1 ❌	spotbugs	0m 15s	/patch-spotbugs-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt	hadoop-mapreduce-client-core in the patch failed.
-1 ❌	spotbugs	0m 11s	/patch-spotbugs-hadoop-tools_hadoop-federation-balance.txt	hadoop-federation-balance in the patch failed.
-1 ❌	shadedclient	6m 51s		patch has errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	0m 19s	/patch-unit-hadoop-common-project_hadoop-common.txt	hadoop-common in the patch failed.
-1 ❌	unit	0m 16s	/patch-unit-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt	hadoop-mapreduce-client-core in the patch failed.
-1 ❌	unit	0m 12s	/patch-unit-hadoop-tools_hadoop-federation-balance.txt	hadoop-federation-balance in the patch failed.
+1 💚	asflicense	0m 20s		The patch does not generate ASF License warnings.
		97m 26s

Subsystem	Report/Notes
Docker	ClientAPI=1.56 ServerAPI=1.56 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8728/1/artifact/out/Dockerfile
GITHUB PR	#8728
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 56a0a0ceb1c0 5.15.0-190-generic #200-Ubuntu SMP Fri Aug 7 15:06:04 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	branch-3.4 / 95f1213
Default Java	Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8728/1/testReport/
Max. process+thread count	549 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core hadoop-tools/hadoop-federation-balance U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8728/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.

[steveloughran]

aah, caught out by the java 8 backport

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 24s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 6 new or modified test files.
			_ branch-3.4 Compile Tests _
+0 🆗	mvndep	53m 17s		Maven dependency ordering for branch
+1 💚	mvninstall	24m 15s		branch-3.4 passed
+1 💚	compile	8m 41s		branch-3.4 passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	compile	7m 54s		branch-3.4 passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	checkstyle	2m 2s		branch-3.4 passed
+1 💚	mvnsite	2m 5s		branch-3.4 passed
+1 💚	javadoc	1m 44s		branch-3.4 passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	2m 12s		branch-3.4 passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	spotbugs	2m 58s		branch-3.4 passed
+1 💚	shadedclient	20m 48s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 23s		Maven dependency ordering for patch
+1 💚	mvninstall	1m 5s		the patch passed
+1 💚	compile	8m 31s		the patch passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javac	8m 31s		the patch passed
+1 💚	compile	8m 4s		the patch passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	javac	8m 4s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	1m 59s		root: The patch generated 0 new + 403 unchanged - 1 fixed = 403 total (was 404)
+1 💚	mvnsite	2m 1s		the patch passed
-1 ❌	javadoc	0m 45s	/results-javadoc-javadoc-hadoop-common-project_hadoop-common-jdkUbuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.txt	hadoop-common-project_hadoop-common-jdkUbuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 generated 1 new + 500 unchanged - 0 fixed = 501 total (was 500)
+1 💚	javadoc	2m 13s		the patch passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	spotbugs	3m 16s		the patch passed
+1 💚	shadedclient	20m 49s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	16m 15s		hadoop-common in the patch passed.
+1 💚	unit	6m 11s		hadoop-mapreduce-client-core in the patch passed.
+1 💚	unit	2m 6s		hadoop-federation-balance in the patch passed.
+1 💚	asflicense	0m 43s		The patch does not generate ASF License warnings.
		205m 39s

Subsystem	Report/Notes
Docker	ClientAPI=1.56 ServerAPI=1.56 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8728/2/artifact/out/Dockerfile
GITHUB PR	#8728
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 66b8c2815c5a 5.15.0-190-generic #200-Ubuntu SMP Fri Aug 7 15:06:04 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	branch-3.4 / ea5f6b5
Default Java	Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8728/2/testReport/
Max. process+thread count	3153 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core hadoop-tools/hadoop-federation-balance U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8728/2/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.