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POwhy does this simple serializable object throw NotSerializableException?
 

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  1. POwhy does this simple serializable object throw NotSerializableException?
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    <p>After getting no answer to my last question, I reformulated the thing to its simplest form. 1 button, 1 clicklistener, 1 serializable object and 1 subroutine to output the serializable object. This code is based on about 6-8 examples I found here on stackoverflow. And yet as simple as it is it still generates this error: W/System.err(228): java.io.NotSerializableException: serobj.testActivity So I challenge you, oh so wise code gurus: why does this code generate this error? And most importantly what do I do to fix it? The entire code followed by log ouput:</p> <pre><code>package serobj; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectOutputStream; import java.io.Serializable; import ser.obj.R; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; public class testActivity extends Activity { /** Called when the activity is first created. */ public class Tester implements Serializable{ /** * */ private static final long serialVersionUID = 1L; public String frog; public Tester(){ frog="frog"; } } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button button1 = (Button) findViewById(R.id.button1); button1.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Testit(); } }); } public void Testit(){ Tester test = new Tester(); FileOutputStream fos; try { fos =openFileOutput("test.fyl", Context.MODE_WORLD_READABLE); Log.d("file open","..."); ObjectOutputStream oos = new ObjectOutputStream(fos); Log.d("ObjOutStr","..."); oos.writeObject(test); Log.d("tried wO","..."); // never gets here... oos.close(); } catch (FileNotFoundException e) { e.printStackTrace(); Log.d ("filenotfound", "filenotfound"); }catch(IOException e){ e.printStackTrace(); Log.d("ioexception", "ioexception"); } } </code></pre> <p>}</p> <pre><code>03-17 04:40:02.691: D/file open(228): ... 03-17 04:40:02.701: D/ObjOutStr(228): ... 03-17 04:40:02.961: W/System.err(228): java.io.NotSerializableException: serobj.testActivity 03-17 04:40:02.971: W/System.err(228): at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1547) 03-17 04:40:02.971: W/System.err(228): at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1854) 03-17 04:40:02.971: W/System.err(228): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1696) 03-17 04:40:02.971: W/System.err(228): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1660) 03-17 04:40:02.971: W/System.err(228): at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:1153) 03-17 04:40:02.971: W/System.err(228): at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:420) 03-17 04:40:02.981: W/System.err(228): at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1251) 03-17 04:40:02.981: W/System.err(228): at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1587) 03-17 04:40:02.981: W/System.err(228): at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1854) 03-17 04:40:02.981: W/System.err(228): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1696) 03-17 04:40:02.981: W/System.err(228): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1660) 03-17 04:40:02.981: W/System.err(228): at serobj.testActivity.Testit(testActivity.java:50) 03-17 04:40:03.015: W/System.err(228): at serobj.testActivity$1.onClick(testActivity.java:37) 03-17 04:40:03.015: W/System.err(228): at android.view.View.performClick(View.java:2364) 03-17 04:40:03.015: W/System.err(228): at android.view.View.onTouchEvent(View.java:4179) 03-17 04:40:03.015: W/System.err(228): at android.widget.TextView.onTouchEvent(TextView.java:6541) 03-17 04:40:03.015: W/System.err(228): at android.view.View.dispatchTouchEvent(View.java:3709) 03-17 04:40:03.015: W/System.err(228): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 03-17 04:40:03.021: W/System.err(228): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 03-17 04:40:03.021: W/System.err(228): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 03-17 04:40:03.021: W/System.err(228): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 03-17 04:40:03.021: W/System.err(228): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 03-17 04:40:03.021: W/System.err(228): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659) 03-17 04:40:03.021: W/System.err(228): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107) 03-17 04:40:03.021: W/System.err(228): at android.app.Activity.dispatchTouchEvent(Activity.java:2061) 03-17 04:40:03.021: W/System.err(228): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643) 03-17 04:40:03.021: W/System.err(228): at android.view.ViewRoot.handleMessage(ViewRoot.java:1691) 03-17 04:40:03.021: W/System.err(228): at android.os.Handler.dispatchMessage(Handler.java:99) 03-17 04:40:03.031: W/System.err(228): at android.os.Looper.loop(Looper.java:123) 03-17 04:40:03.031: W/System.err(228): at android.app.ActivityThread.main(ActivityThread.java:4363) 03-17 04:40:03.031: W/System.err(228): at java.lang.reflect.Method.invokeNative(Native Method) 03-17 04:40:03.031: W/System.err(228): at java.lang.reflect.Method.invoke(Method.java:521) 03-17 04:40:03.031: W/System.err(228): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 03-17 04:40:03.031: W/System.err(228): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 03-17 04:40:03.031: W/System.err(228): at dalvik.system.NativeStart.main(Native Method) 03-17 04:40:03.031: D/ioexception(228): ioexception 03-17 04:51:21.861: D/dalvikvm(56): threadid=15: bogus mon 1+0&gt;0; 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