jamnaritesh opened a new issue, #11983:
URL: https://github.com/apache/ignite/issues/11983
NullPointerException during Client Node Join in Apache Ignite 2.15.0
**Environment:**
Apache Ignite Version: 2.15.0
Cluster Size: 14 server nodes, 4 client nodes
Deployment: Dockerized nodes with host networking
JDK: Java 17
OS: RHEL 9
**Summary**
When a client node attempts to join an existing Apache Ignite cluster, a
NullPointerException is thrown during the partition map exchange phase. The
error occurs in GridCachePartitionExchangeManager.clientTopology, where it
attempts to invoke .config() on a null CacheGroupDescriptor.
**Error Logs**
`04-04-2025 19:59:10.857 [sys-#86] ERROR ROOT.? - Critical system error
detected. Will be handled accordingly to configured handler
[hnd=StopNodeOrHaltFailureHandler [tryStop=false, timeout=0,
super=AbstractFailureHandler [ignoredFailureTypes=UnmodifiableSet
[SYSTEM_WORKER_BLOCKED, SYSTEM_CRITICAL_OPERATION_TIMEOUT]]],
failureCtx=FailureContext [type=CRITICAL_ERROR,
err=java.lang.NullPointerException: Cannot invoke
"o.a.i.i.processors.cache.CacheGroupDescriptor.config()" because "grpDesc" is
null]]
java.lang.NullPointerException: Cannot invoke
"org.apache.ignite.internal.processors.cache.CacheGroupDescriptor.config()"
because "grpDesc" is null
at
org.apache.ignite.internal.processors.cache.GridCachePartitionExchangeManager.clientTopology(GridCachePartitionExchangeManager.java:1055)
at
org.apache.ignite.internal.processors.cache.distributed.dht.preloader.GridDhtPartitionsExchangeFuture.lambda$updatePartitionFullMap$81bdb8e8$1(GridDhtPartitionsExchangeFuture.java:4831)
at
org.apache.ignite.internal.util.IgniteUtils.lambda$null$3(IgniteUtils.java:11609)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:840)
Suppressed: java.lang.NullPointerException: Cannot invoke
"org.apache.ignite.internal.processors.cache.CacheGroupDescriptor.config()"
because "grpDesc" is null
... 7 common frames omitted
04-04-2025 19:59:10.899 [sys-#86] ERROR ROOT.? - JVM will be halted
immediately due to the failure: [failureCtx=FailureContext
[type=CRITICAL_ERROR, err=java.lang.NullPointerException: Cannot invoke
"o.a.i.i.processors.cache.CacheGroupDescriptor.config()" because "grpDesc" is
null]]
`
**Reproduction Steps**
Start a cluster with 14 server nodes.
Try joining 4 client nodes in parallel as the cluster is coming up.
**Impact**
Prevents successful join of client nodes during topology changes.
**Expected Behavior**
Client node should be able to join and complete partition exchange without
encountering NullPointerException.
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