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java.util.ConcurrentModificationException: 	at java.util.ArrayList.writeObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)	at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)	at java.util.Collections$SynchronizedCollection.writeObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.writeObject(Unknown Source)	at net.sf.ehcache.store.DiskStore.writeIndex(DiskStore.java:816)	at net.sf.ehcache.store.DiskStore.flush(DiskStore.java:573)	at net.sf.ehcache.Cache.flush(Cache.java:1509)	at com.wiley.wispers.resolvedoi.EHCacheImpl.main(EHCacheImpl.java:655)