TEZ-4686: NPE when tez-client tries to connect to AM via ZK Mode

[Aggarwal-Raghav]

No description provided.

[tez-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 10s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	detsecrets	0m 1s		detect-secrets was not available.
+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.
			_ master Compile Tests _
+1 💚	mvninstall	8m 47s		master passed
+1 💚	compile	0m 21s		master passed
+1 💚	checkstyle	0m 50s		master passed
+1 💚	javadoc	0m 35s		master passed
+0 🆗	spotbugs	1m 24s		tez-api in master has 545 extant spotbugs warnings.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 18s		the patch passed
+1 💚	codespell	0m 27s		No new issues.
+1 💚	compile	0m 15s		the patch passed
+1 💚	javac	0m 15s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 5s		the patch passed
+1 💚	javadoc	0m 16s		the patch passed
+1 💚	spotbugs	0m 51s		the patch passed
			_ Other Tests _
+1 💚	unit	1m 58s		tez-api in the patch passed.
+1 💚	asflicense	0m 10s		The patch does not generate ASF License warnings.
		17m 16s

Subsystem	Report/Notes
Docker	ClientAPI=1.53 ServerAPI=1.53 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-460/1/artifact/out/Dockerfile
GITHUB PR	#460
Optional Tests	dupname asflicense javac javadoc unit spotbugs checkstyle codespell detsecrets compile
uname	Linux 2c259a1c00a1 5.15.0-164-generic #174-Ubuntu SMP Fri Nov 14 20:25:16 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	/home/jenkins/jenkins-home/workspace/tez-multibranch_PR-460/src/.yetus/personality.sh
git revision	master / 34e405b
Default Java	Ubuntu-21.0.10+7-Ubuntu-124.04
Test Results	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-460/1/testReport/
Max. process+thread count	400 (vs. ulimit of 5500)
modules	C: tez-api U: tez-api
Console output	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-460/1/console
versions	git=2.43.0 maven=3.8.7 spotbugs=4.9.3 codespell=2.4.1
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