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Groups > comp.lang.java.programmer > #31562

NotSerializableException

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Hi,

My code is as follows:

        File ser = new File("locationinstringform");
        FileInputStream fileIn3 = new FileInputStream(ser);
        ObjectInputStream objectIn3 = new ObjectInputStream(fileIn3);
        myObj = (MyObj) objectIn3.readObject();
        objectIn3.close();
        fileIn3.close();
        myObj.someFunction(x, y);
        FileOutputStream fileOut3 = new FileOutputStream(ser);
        ObjectOutputStream objectOut3 = new ObjectOutputStream(fileOut3);
        objectOut3.writeObject(myObj);
        objectOut3.close();
        fileOut3.close();

When I run my code, I get an error tracing to the line that says objectOut3.writeObject(myObj);

The error is as follows: 
Exception in thread "main" java.io.NotSerializableException: java.util.HashMap$KeySet

However, that MyObj class I have defined isn't a HashMap or Set, and doesn't have a HashMap or Set. It only has 2 instance objects, one of which is one is an object I coded, and the other is an ArrayList. I have made sure all classes I have coded implement the serializable interface. 

Any ideas as to why the problem could be arising and what the solution is? I have been stuck for a long time so any help would be much appreciated.

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NotSerializableException akkshaykhoslaa@gmail.com - 2015-04-13 18:51 -0700
  Re: NotSerializableException Robert Klemme <shortcutter@googlemail.com> - 2015-04-14 07:50 +0200
  Re: NotSerializableException Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-04-14 08:13 -0400

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