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Editorial Team
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Asked: 2026-06-04T19:51:07+00:00

public class move implements Serializable { private static final long serialVersionUID = 6696031872468154516L; public

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public class move implements Serializable
{
    private static final long serialVersionUID = 6696031872468154516L;
    public move(int a,int b){
        x=a;
        y=b;
    }
    int x,y;
}

I send this by ObjectOutputStream – just using out.writeObject(params[0]);

When I see LogCat, it says :

06-02 16:09:48.750: W/System.err(6060): java.io.NotSerializableException: com.SWAP.AndTablet.MainActivity
06-02 16:09:48.750: W/System.err(6060):     at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1364)
06-02 16:09:48.750: W/System.err(6060):     at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
06-02 16:09:48.750: W/System.err(6060):     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
06-02 16:09:48.750: W/System.err(6060):     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
06-02 16:09:48.750: W/System.err(6060):     at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979)
06-02 16:09:48.750: W/System.err(6060):     at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:368)
06-02 16:09:48.750: W/System.err(6060):     at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074)
06-02 16:09:48.750: W/System.err(6060):     at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
06-02 16:09:48.750: W/System.err(6060):     at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
06-02 16:09:48.754: W/System.err(6060):     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
06-02 16:09:48.754: W/System.err(6060):     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
06-02 16:09:48.754: W/System.err(6060):     at com.SWAP.AndTablet.MainActivity$MouseMoveSendTask.doInBackground(MainActivity.java:59)
06-02 16:09:48.754: W/System.err(6060):     at com.SWAP.AndTablet.MainActivity$MouseMoveSendTask.doInBackground(MainActivity.java:1)
06-02 16:09:48.754: W/System.err(6060):     at android.os.AsyncTask$2.call(AsyncTask.java:264)
06-02 16:09:48.754: W/System.err(6060):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
06-02 16:09:48.754: W/System.err(6060):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
06-02 16:09:48.754: W/System.err(6060):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
06-02 16:09:48.757: W/System.err(6060):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
06-02 16:09:48.757: W/System.err(6060):     at java.lang.Thread.run(Thread.java:856)

Can anyone help me?

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1 Answer

  1. Editorial Team

    I suspect this is a nested class, which means there’s an implicit reference to the outer class, even if you don’t use it. So if your class is nested within MainActivity, you’ll end up trying to serialize the enclosing instance of MainActivity even though you don’t want to. MainActivity isn’t serializable (and almost certainly shouldn’t be) which is causing the error.

    You can get round this just by making it static:

    public static class Move implements Serializable {
    private final int x, y;
    private static final long serialVersionUID = 6696031872468154516L;

    public Move(int a,int b) {
        x = a;
        y = b;
    }
}

    If it isn’t a nested class, then I suspect the problem doesn’t lie with the code you’ve shown us.

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