CODEWITHSUNDEEP
javaexceptionserialization
Alk
Alk

Reputation: 5557

java.io.NotSerializableException when class implements Serializable

I'm getting the following notSerializableException even though my Hub class implements serializable. This happens when I try to write to a file using ObjectOutputStream. My project contains too many classes to post here reasonably, hence I'm mostly interested in what other reasons there could be for this error other than the class not implementing Serializable. Another puzzling thing is that I am not writing an object of the Hub class to the file, I'm writing an ArrayList of objects from a completely different class which also implements serializable. 

java.io.NotSerializableException: bikescheme.Hub$1
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(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 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.defaultWriteFields(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.defaultWriteFields(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 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.defaultWriteFields(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 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 bikescheme.Database.updateStations(Database.java:366)
at bikescheme.Database.addStation(Database.java:235)
at bikescheme.Hub.addDStation(Hub.java:148)
at bikescheme.HubTerminal.addDStation(HubTerminal.java:71)
at bikescheme.HubTerminal.receiveEvent(HubTerminal.java:52)
at bikescheme.EventDistributor.sendEvent(EventDistributor.java:75)
at bikescheme.EventDistributor.sendEvents(EventDistributor.java:98)
at bikescheme.SystemTest.runTestAndReturnResults(SystemTest.java:359)
at bikescheme.SystemTest.runAndCheck(SystemTest.java:341)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:33)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

Upvotes: 1

Views: 9099

Answers (3)

Alk
Alk

Reputation: 5557

Adding transient to all instances of Clock within the project has solved this problem.

Upvotes: 0

JayC667
JayC667

Reputation: 2576

This should answer all the questions:

public class BadSerializingClass implements Serializable {

    class ThisIsNotOK {} // comment out, it'll work

    class ThisIsOk implements Serializable {}

    // MVs
    ThisIsNotOK m1  = new ThisIsNotOK();    // comment out, it'll work
    ThisIsOk    m2  = new ThisIsOk();

    Runnable    innerAnonymousClass = new Runnable() { // comment out, it'll work
        @Override public void run() {
            System.out.println("Hello");
        }
    };

    public static void main(final String[] args) throws FileNotFoundException, IOException {
        final BadSerializingClass s = new BadSerializingClass();
        final ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("test.dat"));
        oos.writeObject(s);
        System.out.println("All OK");
    }

}

Upvotes: 2

ControlAltDel
ControlAltDel

Reputation: 35011

Looks like you have an anonymous inner class object that isn't serializable (bikscheme.Hub$1):

java.io.NotSerializableException: bikescheme.Hub$1

Upvotes: 3

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