JNI/Ada crashes with put_line

Question

Hello,
i'm invoking a function/procedure in an ada-shared library under linux with works fine so far. when i insert a put_line into the ada function, the vm crashes while executing the put_line. I tried also using a small c library with some output. there everything works fine and the text will be written to the console via printf.
What is wrong with the put_line?
Thanks in advance
Thorsten

Answer 1

With crashed i mean a segmentation violation (sigsegv). I used a procedure with only a put_line in it and it crashes, this shows also the error-log.
The shared library and procedure/function declaration is correct. If i do some arithmetics and returning the value to the java main routine without put_line, this works.
I'm using JDK1.6.0.7 and gnatmake to compile the ada library.
part of the error-log:
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C  [libadalib.so+0x21160]  system__secondary_stack__ss_mark+0x10
C  [libadalib.so+0x17918]  ada__exceptions__exception_traces__notify_exceptionXn+0x4e
C  [libadalib.so+0x17a69]  __gnat_notify_unhandled_exception+0x1c
C  [libadalib.so+0x17aae]  ada__exceptions__exception_propagation__propagate_exceptionXn+0x43
C  [libadalib.so+0x17ae3]  ada__exceptions__raise_from_signal_handler+0x0
C  [libadalib.so+0x17b3e]  ada__exceptions__raise_exception_no_defer+0x0
C  [libadalib.so+0x18212]
C  [libadalib.so+0x1d7d1]  system__file_io__check_write_status+0x41
C  [libadalib.so+0x1b072]  ada__text_io__put_line+0x22
C  [libadalib.so+0x1b237]  ada__text_io__put_line__2+0x27
C  [libadalib.so+0x1615f]  Java_JavaAdaClass_Print+0x27
v  ~BufferBlob::Interpreter
v  ~BufferBlob::Interpreter
v  ~BufferBlob::StubRoutines (1)
V  [libjvm.so+0x21c63d]
V  [libjvm.so+0x3107b8]
V  [libjvm.so+0x21c4d0]
V  [libjvm.so+0x245af6]
V  [libjvm.so+0x2372f8]
C  [java+0x1b98]  JavaMain+0x2c8