java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.owner.sqlite.MyDBHandler.addStudent(com.example.owner.sqlite.Student)' on a null object reference

Stack Overflow | kunal nikam | 3 months ago
  1. 0

    on null object reference error on getText() while inserting in Sqlite-Android

    Stack Overflow | 3 months ago | kunal nikam
    java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.owner.sqlite.MyDBHandler.addStudent(com.example.owner.sqlite.Student)' on a null object reference
  2. 0

    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
  3. 0

    GitHub comment 199#204448212

    GitHub | 8 months ago | pranay-mathur
    java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String org.json.JSONObject.optString(java.lang.String, java.lang.String)' on a null object reference
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  5. 0

    Null Object Reference on db insert

    Stack Overflow | 1 year ago | neo
    java.lang.NullPointerException: Attempt to invoke virtual method 'void com.example.test.myapp.DBHelper.addListItem(java.lang.String, java.lang.String, java.lang.String)' on a null object reference
  6. 0

    Saving markers to map in app crashes with "java.lang.NullPointerException: Attempt to invoke virtual method"

    Stack Overflow | 1 year ago | Wildness
    java.lang.NullPointerException: Attempt to invoke virtual method 'android.database.Cursor android.database.sqlite.SQLiteDatabase.query(java.lang.String, java.lang.String[], java.lang.String, java.lang.String[], java.lang.String, 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 'java.lang.String com.example.owner.sqlite.MyDBHandler.addStudent(com.example.owner.sqlite.Student)' on a null object reference

      at com.example.owner.sqlite.MainActivity.onClick()
    2. com.example.owner
      MainActivity.onClick
      1. com.example.owner.sqlite.MainActivity.onClick(MainActivity.java:35)
      1 frame
    3. Android Platform
      Looper.loop
      1. android.view.View.performClick(View.java:4785)
      2. android.view.View$PerformClick.run(View.java:19884)
      3. android.os.Handler.handleCallback(Handler.java:739)
      4. android.os.Handler.dispatchMessage(Handler.java:95)
      5. android.os.Looper.loop(Looper.java:135)
      5 frames