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PONullPointerException crash reports using static DatabaseHelper
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  1. PONullPointerException crash reports using static DatabaseHelper
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    copied!<p>I’m receiving random NullPointerException crash reports from Google that can’t be reproduced. I’m using a static reference to a class that extends OrmLiteSqliteOpenHelper. The helper is initialised in the main class that extends SherlockFragmentActivity.</p> <pre><code>if (DatabaseHelper.getInstance() == null) { DatabaseHelper.setInstance(this.getApplicationContext()); } </code></pre> <p>At first I though it may occur when the device is rotated or sent to the background. But no amount of testing has been able to recreate the issue. </p> <p>Nowhere in the code is the static mHelper variable set to null</p> <pre><code>public class DatabaseHelper extends OrmLiteSqliteOpenHelper { … private static DatabaseHelper mHelper; … public static DatabaseHelper getInstance() { return DatabaseHelper.mHelper; } public static void setInstance(Context context) { DatabaseHelper.mHelper = new DatabaseHelper(context); } … } </code></pre> <p>Does anyone have any idea of what may be causing this?</p> <p>Follows is one of the reports:</p> <pre><code>java.lang.RuntimeException: Unable to start activity ComponentInfo{au.com.dcbs.tradies/au.com.dcbs.tradies.presentation.document.DocumentActivity}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2049) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2083) at android.app.ActivityThread.access$600(ActivityThread.java:134) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1233) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4697) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at bd.a(Document.java:654) at au.com.dcbs.tradies.presentation.document.DocumentActivity$a.b(DocumentActivity.java:102) at au.com.dcbs.tradies.presentation.document.DocumentActivity$a.onActivityCreated(DocumentActivity.java:78) at e.a(FragmentManager.java:891) at e.a(FragmentManager.java:1080) at e.a(FragmentManager.java:1062) at e.k(FragmentManager.java:1810) at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:501) at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1133) at android.app.Activity.performStart(Activity.java:4549) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2022) ... 11 more </code></pre> <p>line 654 is the first line in this method:</p> <pre><code>public static Document get(long id, Context context) { DocumentEntity entity = DatabaseHelper.getInstance().getDocumentDao().queryForId((int)id); Document doc = new Document(entity, context); return doc; } </code></pre> <p>getDocumentDao returns an object of type <code>com.j256.ormlite.dao.RuntimeExceptionDao</code></p>
 

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