Troubleshooting
Problem
An OutOfMemoryError may occur in WebSphere Application Server with stack frames in com.ibm.ws.session.*.
Symptom
Here is the top of an example OutOfMemoryError stack for this type of problem (note that some stack frames may differ based on session replication versus persistence and other factors):
java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:3580)
at java.io.ByteArrayOutputStream.grow(ByteArrayOutputStream.java:129)
at java.io.ByteArrayOutputStream.ensureCapacity(ByteArrayOutputStream.java:104)
at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:164)
at java.io.ObjectOutputStream$BlockDataOutputStream.drain(ObjectOutputStream.java:1962)
at java.io.ObjectOutputStream$BlockDataOutputStream.flush(ObjectOutputStream.java:1907)
at java.io.ObjectOutputStream.flush(ObjectOutputStream.java:739)
at java.io.ObjectOutputStream.close(ObjectOutputStream.java:760)
at com.ibm.ws.session.store.db.DatabaseHashMapMR$1.run(DatabaseHashMapMR.java:264)
at com.ibm.ws.session.store.db.DatabaseHashMapMR$1.run(DatabaseHashMapMR.java:252)
at java.security.AccessController.doPrivileged(AccessController.java:650)
at com.ibm.ws.session.store.db.DatabaseHashMapMR.handlePropertyHits(DatabaseHashMapMR.java:252)
at com.ibm.ws.session.store.db.DatabaseHashMap.persistSession(DatabaseHashMap.java:2146)
at com.ibm.ws.session.store.common.BackedHashMap.updateSession(BackedHashMap.java:552)
at com.ibm.ws.session.store.common.BackedHashMap.put(BackedHashMap.java:626)
at com.ibm.ws.session.store.common.BackedSession.flush(BackedSession.java:239) [...]
[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Component":"sessions","Platform":[{"code":"PF002","label":"AIX"},{"code":"PF010","label":"HP-UX"},{"code":"PF012","label":"IBM i"},{"code":"PF016","label":"Linux"},{"code":"PF027","label":"Solaris"},{"code":"PF033","label":"Windows"},{"code":"PF035","label":"z\/OS"}],"Version":"All Versions","Edition":"","Line of Business":{"code":"LOB77","label":"Automation Platform"}}]
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Document Information
More support for:
WebSphere Application Server
Software version:
All Versions
Operating system(s):
AIX, HP-UX, IBM i, Linux, Solaris, Windows, z/OS
Document number:
730535
Modified date:
03 March 2025
UID
ibm10730535
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