Android - Array index Out Of bounds but why?

Question

One of my users is experiencing a problem with my app. I have received he stack trace but it's not really pointing me to the problem. All I knoe is that some index is out of bounds, but which index? The trace does not lead me to my code...

I believe I have had this in the past, I might have solved it by disabling minifyEnabled and shrinkResources. These options are enabled again but on my Nexus 6P the app is working fine.

Here the stack trace:

Android-Version

Android 4.0.3 - 4.0.4 1 Iconia Tab A501 (picasso) 1

java.lang.ArrayIndexOutOfBoundsException: length=7; index=7
    at com.baviloworks.braumeister.f.m(Unknown Source)
at com.baviloworks.braumeister.f$1.onClick(Unknown Source)
at android.view.View.performClick(View.java:3511)
at android.view.View$PerformClick.run(View.java:14110)
at android.os.Handler.handleCallback(Handler.java:605)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at     com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(Zygote    Init.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)

I hope someone knows what this could be.

Thanks!

Please correlate this stack trace to the relevant code and include that code in your question. At this point, you know more than we do here. — Tim Biegeleisen
– Tim Biegeleisen, Commented Dec 11, 2016 at 9:50
Your array has been accessed with an illegal index. Would be great to have an example of your code. As well you will find a good explanation of the error here: stackoverflow.com/questions/5554734/… — astek003
– astek003, Commented Dec 11, 2016 at 9:50
Well I do know what would cause such an error, but the stack trace isn't pointing to any of my code. Therefore I don't know what exactly is affected. And again, the app works fine on my phone. What about the (Unknown source)? — Bavilo
– Bavilo, Commented Dec 11, 2016 at 9:51

Dima · Accepted Answer · 2016-12-11 09:59:19Z

2

The stack trace is obfuscated, so first of all we have to decode it so we get the actual file where the exception is thrown:

Launch Android/Sdk/tools/proguard/bin/proguardgui.bat (or .sh if you are on Linux), select Retrace on the left side and then select your mapping.txt.

See http://simplyadvanced.net/blog/android-how-to-decode-proguards-obfuscated-code-from-stack-trace/

answered Dec 11, 2016 at 9:59

Dima

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2 Comments

Bavilo Over a year ago

I will try that in a sec! See I did not know it is obfuscated...thanks! I will report back

Bavilo Over a year ago

Thanks this worked! it has pointed me to a somewhat near location of the error. Time to dig.

Charuka Silva · Accepted Answer · 2016-12-11 09:53:08Z

0

An Array length of 7 means that only the index 6 exist from 0, because in java array indexes start with 0! So this will work till you index to 6

Or in other words the Boundaries of an Array are Array.length -1

answered Dec 11, 2016 at 9:53

Charuka Silva

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5 Comments

Bavilo Over a year ago

Right. But which array? I have lots of arrays. I am waiting for the user to give me feedback on when the error occurs. I really have no clue why this is happening. Like I said this appeared in the past and the problem just went away.

Charuka Silva Over a year ago

lol i am not a god to tell you that . debug and find out . if you posted a logcat i can help. i have no powers to see invisible codes you can start from View.java:3511

Bavilo Over a year ago

Well yea but neither do I. If I knew which code is affected I would have posted it already. And I can hardly tell some user to give me his logcat. That's not going to work :-(. Is there anything weird about the stack trace? I mean if it really is telling me that some array is out of bounds, shouldn't it point me to the one which is affected? Like it always has in the past?

Charuka Silva Over a year ago

java.lang.ArrayIndexOutOfBoundsException: length=7; index=7 at com.baviloworks.braumeister.f.m(Unknown Source) at com.baviloworks.braumeister.f$1.onClick(Unknown Source) at android.view.View.performClick(View.java:3511) This is the key dig in to your code and find out which array is there

Bavilo Over a year ago

Sadly I do not have a file called View.java. And where this Unknown Source is...is well unknown

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