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POHow come I get ClassNotFoundException when backupAgent tries to start
 

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  1. POHow come I get ClassNotFoundException when backupAgent tries to start
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    <p>I use the <code>BackupAgentHelper</code> to backup the <code>SharedPreferences</code> in my Android app. I have tested it in the emulator (Android 1.6 and 2.2) and on my own phone (Android 2.3.3) and it all works well. However, today I got a crash report in the Developer Console looking like this:</p> <pre><code>java.lang.RuntimeException: Unable to create BackupAgent com.xxx.yyy.MyBackupAgent: java.lang.ClassNotFoundException: com.xxx.yyy.MyBackupAgent in loader dalvik.system.PathClassLoader[/mnt/asec/com.xxx.yyy-2/pkg.apk] at android.app.ActivityThread.handleCreateBackupAgent(ActivityThread.java:2114) at android.app.ActivityThread.access$3200(ActivityThread.java:132) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1138) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:143) at android.app.ActivityThread.main(ActivityThread.java:4196) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.ClassNotFoundException: com.xxx.yyy.MyBackupAgent in loader dalvik.system.PathClassLoader[/mnt/asec/com.xxx.yyy-2/pkg.apk] at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240) at java.lang.ClassLoader.loadClass(ClassLoader.java:551) at java.lang.ClassLoader.loadClass(ClassLoader.java:511) at android.app.ActivityThread.handleCreateBackupAgent(ActivityThread.java:2064) ... 10 more </code></pre> <p>The backupAgent is declared in the application tag in the Manifest as:</p> <pre><code>android:backupAgent="com.xxx.yyy.MyBackupAgent" </code></pre> <p>Apparantly, the class <code>MyBackupAgent</code> <em>is</em> present since I can build the <code>.apk</code> and it runs just fine on several devices. So how can it be that it does not find the class here? One thing I notice in the message above is that the app seems to be installed in a path which have my package name AND an appended "-2" at the end. Can this cause the classloader to not see the class in my package since I specify the full package name and class in the <code>android:backupAgent</code>, or is that part irrelevant? Can anybody understand what the reason can be that the class cannot be found?</p> <p>Worth to mention is that my app can be installed on SD card. </p> <p>Excuse me for replacing my real package name with com.xxx.yyy in the message above.</p>
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