I assume you did try gcj-3.0-2 on i386, which was configured without threads by accident. Please fetch the -3 packages, which were just installed in unstable.
Jonathan LaCour writes: > I am just starting out using GCJ and enjoying it very much, however I > have run into a problem with the release of GCJ that is in Debian > unstable. When I attempt to use threads, the program will compile, but > fail with: > > libgcj failure: only thread already running > > As I understand it, this means that GCJ was compiled without thread > support. What is the reasoning for this? Is there a way for me to > enable Thread support without recompiling GCJ? Will Thread support be > in the pacakges in the near future?