Re: NotSerializableException

Eric Sosman <esosman@comcast-dot-net.invalid>
Tue, 14 Apr 2015 08:13:13 -0400
On 4/13/2015 9:51 PM, wrote:


My code is as follows:

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

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.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.

     Your object refers -- directly or indirectly -- to a HashMap.KeySet
instance. You mention an ArrayList: What does that list contain? Does
it, perhaps, hold a Set that turns out to be a HashMap.KeySet? Or does
it hold a Thing that refers to a Widget that refers to a Whatnot that
refers to a Gizmo that refers to a HashMap.KeySet?

     Serializing an object also serializes everything the object refers
to, and everything those objects refer to, and so on through the entire
object graph.

"Don't be afraid of work. Make work afraid of you." -- TLM

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