NullPointerException on primitive boolean property

Question

I am trying to fix a bug that crash an app that I published to the Google Play store.

The crash stack trace from the Google Play console:

java.lang.NullPointerException: 
  at com.myApp.Advertising.InterstitialAdsRunCallback.setViewed (InterstitialAdsRunCallback.java:11)
  at com.myApp.AndroidLauncher$2.onInterstitialAdClosed (AndroidLauncher.java:65)
  at com.ironsource.mediationsdk.A$4.run (A.java:7)
  at android.os.Handler.handleCallback (Handler.java:938)
  at android.os.Handler.dispatchMessage (Handler.java:99)
  at android.os.Looper.loop (Looper.java:223)
  at android.app.ActivityThread.main (ActivityThread.java:7888)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:592)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:981)

The code for the setViewed function is:

package com.myApp.Advertising;

public abstract class InterstitialAdsRunCallback implements Runnable {
    boolean viewed;

    public boolean viewedAd() {
        return viewed;
    }

    public void setViewed(boolean viewed) {
        this.viewed = viewed; // line 11
    }
}

And the code that is calling setViewed:

public void onInterstitialAdClosed() {
    InterstitialAdsRunCallback adRunnable = showInterstitialAdRunnable.getAdRunnable();
    adRunnable.setViewed(true); // line 65
    adRunnable.run();
    IronSource.loadInterstitial();
}

Decompiled InterstitialAdsRunCallback class from the .aab:

.class public abstract Lcom/myApp/Advertising/InterstitialAdsRunCallback;
.super Ljava/lang/Object;
.source "InterstitialAdsRunCallback.java"

# interfaces
.implements Ljava/lang/Runnable;


# instance fields
.field public viewed:Z


# direct methods
.method public constructor <init>()V
    .registers 1

    .line 3
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    return-void
.end method

So, how is a primitive boolean property causing a NullPointerException? I'm probably missing something else.

The code as shown doesn't seem to be able to cause a NullPointerException, which suggests that there might be some compile-time or runtime modification of the code. — Mark Rotteveel, Jun 14 '22 at 08:15

score 1 · Accepted Answer · answered Jun 14 '22 at 08:37

1

R8, ProGuard and other similar optimization tools usually inline accessor methods but the line number information still points to the original source.

If adRunnable is null and the setViewed() accessor is inlined, you'll get an NPE like this.

answered Jun 14 '22 at 08:37

laalto

150,114
66
286
303

score 0 · Answer 2 · answered Jun 14 '22 at 08:36

I think you cann't use the function setViewed() becouse adRunnable object is null not becouse the primitive boolean property ...

 java.lang.NullPointerException: 
  at com.myApp.Advertising.InterstitialAdsRunCallback.setViewed

Check what the return of the function showInterstitialAdRunnable.getAdRunnable(); is it null or not?

score -2 · Answer 3 · answered Jun 14 '22 at 08:11

-2

You cannot instantiate abstract class directly, probably for this reason you're getting NullPointerException.

answered Jun 14 '22 at 08:11

esgungor

1

2

`You cannot instantiate abstract class directly` this will give a compile time error, not runtime, right ? meaning that OP wouldn't even have an app to put on the store if that were the case ? – a_local_nobody Jun 14 '22 at 08:13

NullPointerException on primitive boolean property

3 Answers3