java.lang.NullPointerException: println needs a message [duplicate]

Question

I get the errror: java.lang.NullPointerException: println needs a message when I call this method:

lst_info = new HashMap<String, String>(); SystemDatabaseHandler db = new SystemDatabaseHandler(getApplicationContext()); lst_info = db.getLstInfo(sql_id); 

SystemDatabaseHandler:

public HashMap<String , String> getLstInfo(int id){     HashMap<String , String> lst_temp;     lst_temp = new HashMap<String , String>();      String selectQuery = "SELECT * FROM dkr_lst_lst WHERE lst_id = " + id;     SQLiteDatabase db = this.getWritableDatabase();     Cursor cursor = db.rawQuery(selectQuery, null);     if (cursor.moveToFirst()) {         do {             Log.d("sql_id", cursor.getString(0));             lst_temp.put("sql_id", cursor.getString(0));         }while (cursor.moveToNext());     }      cursor.close();     db.close();     return lst_temp; } 

Log.d("sql_id", cursor.getString(0)); returns:

07-12 11:56:05.603: D/sql_id(13783): 1

The Log Cat:

07-12 11:56:05.613: D/Database(13783): dbclose(): path = /data/data/de.bodprod.dkr/databases/dkr, handle = 0x4301a8 07-12 11:56:05.613: D/AndroidRuntime(13783): Shutting down VM 07-12 11:56:05.613: W/dalvikvm(13783): threadid=1: thread exiting with uncaught exception (group=0x4001d5a0) 07-12 11:56:05.623: E/AndroidRuntime(13783): FATAL EXCEPTION: main 07-12 11:56:05.623: E/AndroidRuntime(13783): java.lang.RuntimeException: Unable to start activity ComponentInfo{de.bodprod.dkr/de.bodprod.dkr.BosLstDetailMap}: java.lang.NullPointerException: println needs a message 07-12 11:56:05.623: E/AndroidRuntime(13783):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1872) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1893) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at android.app.ActivityThread.access$1500(ActivityThread.java:135) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1054) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at android.os.Handler.dispatchMessage(Handler.java:99) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at android.os.Looper.loop(Looper.java:150) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at android.app.ActivityThread.main(ActivityThread.java:4385) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at java.lang.reflect.Method.invokeNative(Native Method) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at java.lang.reflect.Method.invoke(Method.java:507) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at dalvik.system.NativeStart.main(Native Method) 07-12 11:56:05.623: E/AndroidRuntime(13783): Caused by: java.lang.NullPointerException: println needs a message 07-12 11:56:05.623: E/AndroidRuntime(13783):    at android.util.Log.println_native(Native Method) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at android.util.Log.d(Log.java:137) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at de.bodprod.dkr.BosLstDetailMap.onCreate(BosLstDetailMap.java:43) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072) 07-12 11:56:05.623: E/AndroidRuntime(13783):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1836) 07-12 11:56:05.623: E/AndroidRuntime(13783):    ... 11 more 07-12 11:56:07.495: D/Process(13783): killProcess, pid=13783 

Answer 1

Maybe when you call

Log.d("sql_id", cursor.getString(0));  

cursor.getString(0) returns null, and then it crashes.

Try :

if(cursor.getString(0) != null) {     Log.d("sql_id", cursor.getString(0));  } 

Otherwise, show us: de.bodprod.dkr.BosLstDetailMap.onCreate(BosLstDetailMap.java:43)

Answer 2

try as:

Log.d("sql_id"," " + cursor.getString(0)); 

instead of

Log.d("sql_id", cursor.getString(0)); 

beacuse maybe you are passing second parameter in Log.d empty or null