CODEWITHSUNDEEP
javaserialization
claire
claire

Reputation: 93

java.io.invalidClassException - which class is causing it?

I am getting an InvalidClassException when trying to open a serialized class. The class I am trying to open is quite complex and contains several other classes. Is there any way of telling which class is causing the exception?

I have set serialVersionUID on all classes and used transient variables where necessary. Presumably I have failed do to this for all classes, but I would like to find a way of locating the error without having to read through the code for every class.

Here is the stack trace I'm getting:

java.io.InvalidClassException: javax.swing.event.EventListenerList; local class incompatible: stream classdesc serialVersionUID = -5677132037850737084, local class serialVersionUID = -7977902244297240866
    at java.base/java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:728)
    at java.base/java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:2086)
    at java.base/java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1933)
    at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2259)
    at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1768)
    at java.base/java.io.ObjectInputStream$FieldValues.<init>(ObjectInputStream.java:2641)
    at java.base/java.io.ObjectInputStream.readFields(ObjectInputStream.java:725)
    at java.desktop/javax.swing.tree.DefaultTreeModel.readObject(DefaultTreeModel.java:704)
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
    at java.base/java.lang.reflect.Method.invoke(Method.java:577)
    at java.base/java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1231)
    at java.base/java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2458)
    at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2292)
    at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1768)
    at java.base/java.io.ObjectInputStream$FieldValues.<init>(ObjectInputStream.java:2641)
    at java.base/java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2492)
    at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2292)
    at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1768)
    at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:543)
    at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:501)
    at combined.CombinedInterface.open(CombinedInterface.java:82)
    at combined.CombinedInterface.main(CombinedInterface.java:18)

Also, this problem doesn't occur when I'm running the program in NetBeans, it only occurs when I'm running it from a jar file outside of Netbeans.

Upvotes: 0

Views: 224

Answers (1)

Stephen C
Stephen C

Reputation: 718798

The class that is causing this is javax.swing.event.EventListenerList.

Note that you should generally avoid serializing Swing classes. Many Swing classes state this in their javadocs:

"Serialized objects of this class will not be compatible with future Swing releases."

So if your use-case entails serializing with one version of Java and potentialiiy deserializing with another version, you are liable to run into this kind of problem.

Upvotes: 2

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