不同JVM的java序列化问题

Question

I am having trouble using serialization in Java. I've searched the web for a solution but haven't found an answer yet.

The problem is this - I have a Java library (I have the code and I export it to an archive prior to executing the code) which I need to use with two differents JVMs. One JVM is on the server (Ubuntu, running Java(TM) JRE SE Runtime Environment (build 1.7.0_09-b05)) and the other on Android 2.3.3. I compiled the library in Java 1.6.

Now, I am trying to import to the client, an object exported from the server, but I receive this error:

java.io.InvalidClassException: [Lweka.classifiers.functions.MultilayerPerceptron$NeuralEnd;; Incompatible class (SUID): [Lweka.classifiers.functions.MultilayerPerceptron$NeuralEnd;: static final long serialVersionUID =-359311387972759020L; but expected [Lweka.classifiers.functions.MultilayerPerceptron$NeuralEnd;: static final long serialVersionUID =1920571045915494592L;

I do have an explicit serial version UID declared on the class MultilayerPerceptron$NeuralEnd , like this:

protected class NeuralEnd extends NeuralConnection {
    private static final long serialVersionUID = 7305185603191183338L;
}

Where NeuralConnection implements the java.io.Serializable interface. If I do a serialver on MultilayerPerceptron$NeuralEnd I receive the serialVersionUID which I declared. So, why have both JVMs changed this value? Can you help me?

Thanks, Alberto

Answer 1

There is no solution in my opinion. Serialization does not work between different JVM version (Dalvik is not even JVM...). Look for other solution like JSON/XML object serialization.

Answer 2

Your serialVersionUID value is wrong. Set it to the 'expected' value in the error message.