Getting Abort trap: 6 on load JNI Library

[Evandro Rathke]

Hi!

I'm trying to use LuaJava with Avian and I'm getting this error.

The library is working with Java VM.

I'm running Avian on Mac OSX 10.10.5

Thanks in advance.

[Joshua Warner]

Hmm... Seeing the error in question will make debugging a lot easier.  Did you perhaps forget to attach it or maybe some intermediate system stripped it off?

-Joshua

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[Joel Dice .]

Or, if it's just aborting without any error output, please provide a list of steps to reproduce it and I'll see if I can debug it.

[Evandro Rathke]

I'm newbie on using Avian, probably I'm doing something wrong :S

I did the steps below:

1. Compile LuaJava as dynamic library
   
2. Put the LuaJava Library on Avian build folder 
3. Run my application that uses LuaJava with Avian.
4. Get the "Abort trap: 6" error.

LuaJava depends from Lua Library to be built. Can it be the problem?

Thanks!

[Joel Dice]

I just tried building LuaJava myself, but it didn't like the Debian liblua5.1-0-dev package for some reason.  I'll try again this weekend with a liblua built from source and let you know what happens.

[Evandro Rathke]

Hi Joel!

I did a simple code to find the error. I'm getting the same error when I call GetMethodId looking for a constructor.

Example:

1: jclass cls = env->FindClass("com/test/HelloNative");

2: jmethodID constructor = env->GetMethodID(cls, "<init>", "()V");

3: jobject obj = env->NewObject(cls, constructor);

the application crashes on line 2 with "Abort trap: 6" error.

Looks like the same error on thread "GetMethodID returns 0x1".

Thanks in advance.

[Evandro Rathke]

Just ignore my last post... I'm getting a non existent class on this case. Maybe LuaJava is trying to do something similar...

Sorry!

[Joel Dice .]

Is FindClass returning null?  If so, that's the problem, and it means that the VM can't find the class you asked for (i.e. the classpath specified incorrectly when the VM was initialized).  You can add a call to ExceptionDescribe to print the Java exception trace if that's what's happening.  It's a good idea to try adding ExceptionCheck and ExceptionDescribe calls to your JNI code when debugging issues like this.

[Evandro Rathke]

Hi Joel!

I will try to do that you said. I was trying to use avian -cp "luajava.jar" when I got the error. So, I tried to embedded a simple application and it works. I will do the same with LuaJava, embedding the classes and the native library and post the result here.

Thanks again!

[Evandro Rathke]

I got back to this issue and finally solve it.

LuaJava calls env->AllocObject and the VM is aborted. I just replace it for env->NewObject and it works.

[Joel Dice .]

Thanks for following up.  I don't know why AllocObject even exists in the JNI spec, but I guess we'd better implement it.  I'll post a PR when I get a chance.

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