tomcat的backgroundProcess在处理session时出现堆内存溢出问题

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org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor processChildren
严重: Exception invoking periodic operation:
java.lang.OutOfMemoryError: Java heap space
 at java.lang.reflect.Array.newArray(Native Method)
 at java.lang.reflect.Array.newInstance(Array.java:52)
 at java.util.Arrays.copyOf(Arrays.java:2760)
 at java.util.Arrays.copyOf(Arrays.java:2734)
 at java.util.AbstractCollection.finishToArray(AbstractCollection.java:198)
 at java.util.AbstractCollection.toArray(AbstractCollection.java:173)
 at org.apache.catalina.session.ManagerBase.findSessions(ManagerBase.java:873)
 at org.apache.catalina.session.ManagerBase.processExpires(ManagerBase.java:676)
 at org.apache.catalina.session.ManagerBase.backgroundProcess(ManagerBase.java:667)
 at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1316)
 at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
 at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
 at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
 at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
 at java.lang.Thread.run(Thread.java:662)