Java JNI - passing arrays in and out of native calls

Problem:
I needed return as a function parameter an array of int plus the length of the array.

#commands relative to src
//compile class
javac -classpath .  com/wmmnpr/c2/Pm4.java

//create header file
javah -classpath .  com.wmmnpr.c2.Pm4


//compile c code
g++  -fpic  -W1,--add-stdcall-alias -I /usr/jdk/jdk1.6.0_06/include -I /us
r/jdk/jdk1.6.0_06/include/solaris -shared -o libpm4lib.so  com_wmmnpr_c2_P
m4.c

//compile class using native method(driver)
javac -classpath .  com/wmmnpr/app/CallLib.java

//loading of library
in file:

 static {

        System.loadLibrary("pm4lib");

 }

//name of library on disk in working directory (/sa-home/pennoye/jni/src)
libpm4lib.so

//run driver
java -classpath /sa-home/pennoye/jni/src  -Djava.library.path=/sa-home/pen
noye/jni/src com.wmmnpr.app.CallLib

The code for the project is here: