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POAndroid: DB4O Problems
 

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  1. POAndroid: DB4O Problems
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    <p>I'm trying to populate a listviewactivity's list with objects returned from an DB40 database, but my app keeps crashing and I'm not entirely sure why.</p> <p>It would help if I knew how to read LogCat and be able to go from what it says -.- I can get a rough understanding I just don't know what exactly is going wrong.</p> <pre><code>public class AndrochieveActivity extends ListActivity { private List&lt;Achievement&gt; achieves; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ObjectContainer db = Db4oEmbedded.openFile("achievements.db4o"); try{ achieves = db.query(Achievement.class); } finally { db.close(); } setListAdapter(new ArrayAdapter&lt;Achievement&gt;(this, R.layout.achievelist, achieves) { @Override public View getView(int pos, View cView, ViewGroup parent) { View row = mInflater.inflate(R.layout.achievelist, null); TextView title = (TextView) row.findViewById(R.id.title); title.setText(getItem(pos).GetTitle()); TextView desc = (TextView)row.findViewById(R.id.desc); desc.setText(getItem(pos).GetDescription()); TextProgressBar prog = (TextProgressBar)row.findViewById(R.id.prog); prog.setProgress(0); prog.setMax(getItem(pos).GetMax()); return row; } }); } </code></pre> <p>I'm not seeing anything that would inherently screw it up. Db4oEmbedded.openFile should create the file if it doesn't exit, but I keep getting a bunch of file read errors in logcat, from what it looks like:</p> <pre><code>11-29 14:21:44.359: D/AndroidRuntime(19396): Shutting down VM 11-29 14:21:44.359: W/dalvikvm(19396): threadid=1: thread exiting with uncaught exception (group=0x4001d5a0) 11-29 14:21:44.389: E/AndroidRuntime(19396): FATAL EXCEPTION: main 11-29 14:21:44.389: E/AndroidRuntime(19396): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.megalon.androchieve/com.megalon.androchieve.AndrochieveActivity}: com.db4o.ext.Db4oIOException: /achievements.db4o (Read-only file system) 11-29 14:21:44.389: E/AndroidRuntime(19396): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1849) 11-29 14:21:44.389: E/AndroidRuntime(19396): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1870) 11-29 14:21:44.389: E/AndroidRuntime(19396): at android.app.ActivityThread.access$1500(ActivityThread.java:132) 11-29 14:21:44.389: E/AndroidRuntime(19396): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1051) 11-29 14:21:44.389: E/AndroidRuntime(19396): at android.os.Handler.dispatchMessage(Handler.java:99) 11-29 14:21:44.389: E/AndroidRuntime(19396): at android.os.Looper.loop(Looper.java:150) 11-29 14:21:44.389: E/AndroidRuntime(19396): at android.app.ActivityThread.main(ActivityThread.java:4312) 11-29 14:21:44.389: E/AndroidRuntime(19396): at java.lang.reflect.Method.invokeNative(Native Method) 11-29 14:21:44.389: E/AndroidRuntime(19396): at java.lang.reflect.Method.invoke(Method.java:507) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607) 11-29 14:21:44.389: E/AndroidRuntime(19396): at dalvik.system.NativeStart.main(Native Method) 11-29 14:21:44.389: E/AndroidRuntime(19396): Caused by: com.db4o.ext.Db4oIOException: /achievements.db4o (Read-only file system) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.io.RandomAccessFileFactory.newRandomAccessFile(RandomAccessFileFactory.java:26) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.io.FileStorage$FileBin.&lt;init&gt;(FileStorage.java:43) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.io.FileStorage.open(FileStorage.java:22) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.io.StorageDecorator.open(StorageDecorator.java:27) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.io.CachingStorage.open(CachingStorage.java:52) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.internal.IoAdaptedObjectContainer.openImpl(IoAdaptedObjectContainer.java:57) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.internal.ObjectContainerBase$1.run(ObjectContainerBase.java:140) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.foundation.DynamicVariable.with(DynamicVariable.java:54) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.foundation.Environments.runWith(Environments.java:28) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.internal.ObjectContainerBase.withEnvironment(ObjectContainerBase.java:161) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.internal.ObjectContainerBase.open(ObjectContainerBase.java:131) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.internal.IoAdaptedObjectContainer.&lt;init&gt;(IoAdaptedObjectContainer.java:35) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.internal.ObjectContainerFactory.openObjectContainer(ObjectContainerFactory.java:18) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.Db4oEmbedded.openFile(Db4oEmbedded.java:65) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.Db4oEmbedded.openFile(Db4oEmbedded.java:76) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.megalon.androchieve.AndrochieveActivity.onCreate(AndrochieveActivity.java:45) 11-29 14:21:44.389: E/AndroidRuntime(19396): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072) 11-29 14:21:44.389: E/AndroidRuntime(19396): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1813) 11-29 14:21:44.389: E/AndroidRuntime(19396): ... 11 more 11-29 14:21:44.389: E/AndroidRuntime(19396): Caused by: java.io.FileNotFoundException: /achievements.db4o (Read-only file system) 11-29 14:21:44.389: E/AndroidRuntime(19396): at org.apache.harmony.luni.platform.OSFileSystem.open(Native Method) 11-29 14:21:44.389: E/AndroidRuntime(19396): at dalvik.system.BlockGuard$WrappedFileSystem.open(BlockGuard.java:232) 11-29 14:21:44.389: E/AndroidRuntime(19396): at java.io.RandomAccessFile.&lt;init&gt;(RandomAccessFile.java:132) 11-29 14:21:44.389: E/AndroidRuntime(19396): at java.io.RandomAccessFile.&lt;init&gt;(RandomAccessFile.java:173) 11-29 14:21:44.389: E/AndroidRuntime(19396): at com.db4o.io.RandomAccessFileFactory.newRandomAccessFile(RandomAccessFileFactory.java:19) 11-29 14:21:44.389: E/AndroidRuntime(19396): ... 28 more 11-29 14:21:44.419: D/dalvikvm(19396): GC_CONCURRENT freed 308K, 49% free 2900K/5639K, external 0K/0K, paused 2ms+3ms 11-29 14:21:46.310: D/Process(19396): killProcess, pid=19396 11-29 14:21:46.310: D/Process(19396): dalvik.system.VMStack.getThreadStackTrace(Native Method) 11-29 14:21:46.320: D/Process(19396): java.lang.Thread.getStackTrace(Thread.java:745) 11-29 14:21:46.320: D/Process(19396): android.os.Process.killProcess(Process.java:797) 11-29 14:21:46.320: D/Process(19396): com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException(RuntimeInit.java:108) 11-29 14:21:46.320: D/Process(19396): java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:854) </code></pre>
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