Tomcat periodically encounters Java heap space OOM error

정윤미_e95d7m

Problem : 

Tomcat periodically encounters Java heap space OOM error and the Confluence web page is down.

 

Error Log :

java.lang.OutOfMemoryError: Java heap space
java.lang.IllegalStateException: Fatal Exception thrown on Scheduler.Worker thread.
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:62)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space
Exception in thread "AsyncFileHandlerWriter-1259475182" java.lang.OutOfMemoryError: Java heap space
Exception in thread "C3P0PooledConnectionPoolManager[identityToken->z8kfltaa19zvp6e1xi04fp|796573de]-AdminTaskTimer" java.lang.OutOfMemoryError: Java heap space
Exception in thread "I/O dispatcher 3" java.lang.OutOfMemoryError: Java heap space

 

We did : 

Location: /opt/atlassian/wiki/bin

File name: setenv.sh

2.1 Changed from Xmx1024m to Xmx2048m
CATALINA_OPTS="-Xms1024m -Xmx2048m -XX:+UseG1GC ${CATALINA_OPTS}"

2.2 Option to create dump when OOM occurs later
export CATALINA_OPTS=" ${CATALINA_OPTS} -XX:+HeapDumpOnOutOfMemoryError"
export CATALINA_OPTS=" ${CATALINA_OPTS} -XX:HeapDumpPath=/test2/was/apache-tomcat-9.0.12/logs/hdump"

 

Result :

The server started well, so the wiki page was well connected.

But When editing and copying pages, etc., it becomes infinitely loaded, and an error occurred that could not be retrieved.

 

Please let us know how we should solve this problem.

 

Nic Brough -Adaptavist-

This is often what it says - the heap is too small for something in your Confluence and you need to give it more memory.

However, there's also a db error in there, and sometimes those can cause loops which then cause memory leaks, leading to the heap space error.

What are the database settings in confluence.cfg.xml in the home directory?  Do NOT give us all of the file, it's got private stuff in it.  We only need to see the lines starting with <property name="hibernate. and please remove the username and password lines completely as well.