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This exception has no message.
java.lang.NullPointerException: 	at java.util.ArrayList.writeObject(ArrayList.java:706)	at sun.reflect.GeneratedMethodAccessor86.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:601)	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)	at java.util.ArrayList.writeObject(ArrayList.java:710)	at sun.reflect.GeneratedMethodAccessor86.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:601)	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)	at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:438)	at net.sf.ehcache.Element.writeObject(Element.java:835)	at sun.reflect.GeneratedMethodAccessor44.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:601)	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)	at net.sf.ehcache.util.MemoryEfficientByteArrayOutputStream.serialize(MemoryEfficientByteArrayOutputStream.java:97)	at net.sf.ehcache.store.disk.DiskStorageFactory.serializeElement(DiskStorageFactory.java:405)	at net.sf.ehcache.store.disk.DiskStorageFactory.write(DiskStorageFactory.java:384)	at net.sf.ehcache.store.disk.DiskStorageFactory$DiskWriteTask.call(DiskStorageFactory.java:485)	at net.sf.ehcache.store.disk.DiskStorageFactory$PersistentDiskWriteTask.call(DiskStorageFactory.java:1088)	at net.sf.ehcache.store.disk.DiskStorageFactory$PersistentDiskWriteTask.call(DiskStorageFactory.java:1072)