Android application crash at unknown source

Question

I have an application which crashed 2 times randomly with a weird logcat message.

Here is it (both crashes are identical):

05-17 15:45:56.792 31082-31082/? E/AndroidRuntime: FATAL EXCEPTION: main
                                               Process: net.mycustom.application, PID: 31082
                                               java.lang.NullPointerException: Attempt to invoke virtual method 'net.mycustom.application.tools.i net.mycustom.application.MyService.a(java.lang.Integer)' on a null object reference
                                                   at net.mycustom.application.tools.a.b.onCreateDialog(Unknown Source:83)
                                                   at android.app.DialogFragment.onGetLayoutInflater(DialogFragment.java:411)
                                                   at android.app.Fragment.performGetLayoutInflater(Fragment.java:1339)
                                                   at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1298)
                                                   at android.app.FragmentManagerImpl.addAddedFragments(FragmentManager.java:2426)
                                                   at android.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2205)
                                                   at android.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2161)
                                                   at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2062)
                                                   at android.app.FragmentManagerImpl$1.run(FragmentManager.java:738)
                                                   at android.os.Handler.handleCallback(Handler.java:873)
                                                   at android.os.Handler.dispatchMessage(Handler.java:99)
                                                   at android.os.Looper.loop(Looper.java:280)
                                                   at android.app.ActivityThread.main(ActivityThread.java:6706)
                                                   at java.lang.reflect.Method.invoke(Native Method)
                                                   at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
                                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

I have files in net/mycustom/application/tools (but there is nothing like "i").

Also I have a service here: net/mycustom/application/MyService.java (there is nothing like "a" in this service.)

How can I hunt down this issue? (Unknown source?)

This Q shall have been asked before but my intention was to decode the obfuscated names in my classes. Null pointer exception is clear I just had no idea where should I search it for. Therefore it might be better to point to proguard duplicates and not the nullpointer one. — Daniel, May 17 '19 at 21:55

score 1 · Accepted Answer · answered May 17 '19 at 20:49

It is likely ProGuard changed a method's name to a. Try deobfuscating the trace (as given in many tutorials that you can search up), and see the method's actual name. Then try to figure what is causing the NullPointerException.

(the OP asked for how they can hunt the issue down, not what exactly is the solution)

Android application crash at unknown source

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