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This exception has no message.
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java.util.ConcurrentModificationException: 	at java.util.ArrayList.writeObject(Unknown Source)	at sun.reflect.GeneratedMethodAccessor1.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 drawingwf.TCPClient.main(TCPClient.java:95)