java.lang.NullPointerException: Attempt to invoke virtual method 'void android.database.sqlite.SQLiteDatabase.execSQL(java.lang.String)' on a null object reference

Stack Overflow | Moses | 4 months ago
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    Null pointer exception: Attempt to invoke virtual method on a null object reference Android

    Stack Overflow | 2 years ago
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.database.sqlite.SQLiteDatabase.execSQL(java.lang.String)' on a null object reference
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    java.lang.RuntimeException: Unable to stop activity {net.kindows.chitchat/net.kindows.chitchat.LoginActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void org.eclipse.paho.android.service.MqttService.disconnect(java.lang.String, java.lang.String, java.lang.String)' on a null object reference

    GitHub | 6 months ago | dmsherazi
    java.lang.RuntimeException: Unable to stop activity {net.kindows.chitchat/net.kindows.chitchat.LoginActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void org.eclipse.paho.android.service.MqttService.disconnect(java.lang.String, java.lang.String, java.lang.String)' on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void android.database.sqlite.SQLiteDatabase.execSQL(java.lang.String)' on a null object reference

      at com.canre.backup1.DatabaseHelper.onCreate()
    2. com.canre.backup1
      DatabaseHelper.onCreate
      1. com.canre.backup1.DatabaseHelper.onCreate(DatabaseHelper.java:25)
      1 frame
    3. Android Platform
      SQLiteOpenHelper.getWritableDatabase
      1. android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:251)
      2. android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163)
      2 frames
    4. com.canre.backup1
      MainActivity.onLoadFinished
      1. com.canre.backup1.DatabaseHelper.insertData(DatabaseHelper.java:34)
      2. com.canre.backup1.MainActivity.onLoadFinished(MainActivity.java:58)
      3. com.canre.backup1.MainActivity.onLoadFinished(MainActivity.java:22)
      3 frames