java.lang.OutOfMemoryError: Java heap space

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java.lang.OutOfMemoryError: Java heap space
at java.util.concurrent.ConcurrentHashMap$ValuesView.iterator(
at java.util.AbstractCollection.addAll(
at java.util.TreeSet.addAll(
at org.apache.catalina.webresources.Cache.backgroundProcess(
at org.apache.catalina.webresources.StandardRoot.backgroundProcess(
at org.apache.catalina.core.StandardContext.backgroundProcess(
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(

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