uninitialized Output

Hi! I'm trying to run some pascal with java. After Markus Gerwinsky help and some hard work getting libgpc to be shared library it is possible. The problem that the first example I tried was printing something from Pascal with writeln. Then I got a runtime error that Output variable is uninitialized. Shouldn't gpc work with standard descriptors or the StdOut, StdErr and the rest should be initialized somehow? also how should I initialize them? To what device/descriptor etc? opening file and writing into it works. Nick