Hi all, I'm new here, so I hope this is a relevant post... I have a command-line C program compiled under gcc on my 64 bit fedora core 2 box, all working very well. Now I wish to package the C source into a shared object, to be called from another java program (java 1.5 for 64 bit linux) I build my shared object as follows: gcc -c -fPIC <c source files> gcc -fPIC -shared <obj files> -o liblibrary.so ...which all works fine. I then put the .so into a place it can be found at runtime. However, when I run the java project, it successfully kicks off the .so, but crashes in the middle of one of my C routines. I have recompiled and run the same project on Windows using a DLL, with success. So my suspicions are that I have somehow incorrectly built my .so. Any help is greatly appreciated, Shane