android application crashing with error java.lang.RuntimeException: Unable to instantiate activity ComponentInfo

Question

I am developing an android application. When i am trying to run it on emulator it crashes. It is my first android application and I am not able to find out the cause of error. Can anybody point out the mistake?

LogCat

    Shutting down VM
FATAL EXCEPTION: main
 Process: io.github.ishankgulati.breakout, PID: 3589
 java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{io.github.ishankgulati.breakout/io.github.ishankgulati.breakout.BreakoutGame}: java.lang.IllegalAccessException: void io.github.ishankgulati.breakout.BreakoutGame.<init>() is not accessible from java.lang.Class<android.app.Instrumentation>
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
     at android.app.ActivityThread.-wrap11(ActivityThread.java)
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
     at android.os.Handler.dispatchMessage(Handler.java:102)
     at android.os.Looper.loop(Looper.java:148)
     at android.app.ActivityThread.main(ActivityThread.java:5417)
     at java.lang.reflect.Method.invoke(Native Method)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
  Caused by: java.lang.IllegalAccessException: void io.github.ishankgulati.breakout.BreakoutGame.<init>() is not accessible from java.lang.Class<android.app.Instrumentation>
     at java.lang.Class.newInstance(Native Method)
     at android.app.Instrumentation.newActivity(Instrumentation.java:1067)
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2317)
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
     at android.app.ActivityThread.-wrap11(ActivityThread.java) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:148) 
     at android.app.ActivityThread.main(ActivityThread.java:5417) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
12-29 19:10:34.689 3589-3589/? I/Process: Sending signal. PID: 3589 SIG: 9

You can have a look at my project here.

The above issue has been resolved but still application is crashing.

LogCat

I/art: Not late-enabling -Xcheck:jni (already on)
I/art: Late-enabling JIT
I/art: JIT created with code_cache_capacity=2MB compile_threshold=1000
W/System: ClassLoader referenced unknown path: /data/app/io.github.ishankgulati.breakout-1/lib/x86
E/WVMExtractor: Failed to open libwvm.so: dlopen failed: library "libwvm.so" not found
I/OMXClient: Using client-side OMX mux.
D/MediaPlayer: setSubtitleAnchor in MediaPlayer
W/art: Suspending all threads took: 33.410ms
I/OMXClient: Using client-side OMX mux.
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: io.github.ishankgulati.breakout, PID: 2303
java.lang.RuntimeException: Unable to start activity ComponentInfo{io.github.ishankgulati.breakout/io.github.ishankgulati.breakout.BreakoutGame}: java.lang.NullPointerException: Attempt to write to field 'float android.graphics.RectF.left' on a null object reference
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
   at android.app.ActivityThread.-wrap11(ActivityThread.java)
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
   at android.os.Handler.dispatchMessage(Handler.java:102)
   at android.os.Looper.loop(Looper.java:148)
   at android.app.ActivityThread.main(ActivityThread.java:5417)
   at java.lang.reflect.Method.invoke(Native Method)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to write to field 'float android.graphics.RectF.left' on a null object reference
   at io.github.ishankgulati.breakout.MainMenu.<init>(MainMenu.java:33)
   at io.github.ishankgulati.breakout.BreakoutGame$BreakoutView.<init>(BreakoutGame.java:84)
   at io.github.ishankgulati.breakout.BreakoutGame$BreakoutView.<init>(BreakoutGame.java:51)
   at io.github.ishankgulati.breakout.BreakoutGame.onCreate(BreakoutGame.java:29)
   at android.app.Activity.performCreate(Activity.java:6237)
   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
   at android.app.ActivityThread.-wrap11(ActivityThread.java) 
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
   at android.os.Handler.dispatchMessage(Handler.java:102) 
   at android.os.Looper.loop(Looper.java:148) 
   at android.app.ActivityThread.main(ActivityThread.java:5417) 
   at java.lang.reflect.Method.invoke(Native Method) 
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

developer.android.com/reference/java/lang/…

2Dee
– 2Dee

2015-12-29 14:40:03 +00:00
Commented Dec 29, 2015 at 14:40 — 2Dee
– 2Dee, Commented Dec 29, 2015 at 14:40

Blackbelt · Accepted Answer · 2015-12-29 14:41:52Z

6

your BreakoutGame

public class BreakoutGame extends Activity{

is overriding the default constructor chaining its visibility. This is causing the exception. Don't do it. Every initialization, yo want to do in your Constructor can be done in one of the callback called by the framework. E.g onCreate

answered Dec 29, 2015 at 14:41

Blackbelt

158k31 gold badges308 silver badges310 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Ishank Gulati Over a year ago

That resolved this error but now I am getting a new one.

Blackbelt Over a year ago

would you share it with us ?

Ishank Gulati Over a year ago

Thanks for helping out. I have edited the question and added current log.

Blackbelt Over a year ago

add playButton.rect = new Rectf() before playButton.rect.left = 0 in the Constructor of MainMenu

Community · Accepted Answer · 2020-06-20 09:12:55Z

3

It is because in your BreakoutGame activity you have an empty constructor without any access modifiers (default is package private).

BreakoutGame() {
        Display display = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        screenX = size.x;
        screenY = size.y;
    }

Please change it to

public BreakoutGame(){
.....
}

It will definitely work.

Again move your codes from constructor to onCreate method.

edited Jun 20, 2020 at 9:12

CommunityBot

11 silver badge

answered Dec 29, 2015 at 14:47

Sanif SS

6525 silver badges21 bronze badges

Comments

AndroidGuy · Accepted Answer · 2020-02-27 04:33:02Z

3

I was getting this exception since I removed public access modifier from App.java while fixing lint errors. Adding back the public keyword immediately fixed it.

public class MyApp extends Application

answered Feb 27, 2020 at 4:33

AndroidGuy

1,3304 gold badges16 silver badges33 bronze badges

Collectives™ on Stack Overflow

android application crashing with error java.lang.RuntimeException: Unable to instantiate activity ComponentInfo

3 Answers 3

4 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

4 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related