[fpc-pascal] Java crash when fpc library CallVoidMethod in a thread.

[patspiper]

On 02/05/14 02:22, fredvs wrote:
> Hello.
>
> When a java class use a fpc library that call jni.CallVoidMethod inside a
> thread it crash the application.
>
> If the fpc library call jni.CallVoidMethod  directly (not via a thread) =>
> perfect, it works.
>
> Is that a known problem ?
>
> Maybe does it exist something else than jni.CallVoidMethod for inside a
> thread (like synchronize or queue for procedure of object) ?
>
> Here the java error message :
>
> # A fatal error has been detected by the Java Runtime Environment:
> #
> #  SIGSEGV (0xb) at pc=0x00007f6d0e405be1, pid=5145, tid=140105962755840
> #
> # JRE version: OpenJDK Runtime Environment (7.0_51) (build 1.7.0_51-b00)
> # Java VM: OpenJDK 64-Bit Server VM (24.45-b08 mixed mode linux-amd64
> compressed oops)
> # Problematic frame:
> # V  [libjvm.so+0x4debe1]
> Exceptions::throw_stack_overflow_exception(Thread*, char const*, int,
> methodHandle)+0x211
> #
> # Failed to write core dump. Core dumps have been disabled. To enable core
> dumping, try "ulimit -c unlimited" before starting Java again

Did you use AttachCurrentThread and DetachCurrentThread?

Pay attention to the validity of local references as well as their number.

Posting some code might help.

Stephano