Does not run with

#include <java/lang/Object.h>#include <java/awt/Frame.h>#include <java/awt/Button.h>#include <java/awt/FlowLayout.h>#include <java/awt/LayoutManager.h>#include <gcj/array.h>#include <gcj/cni.h>using namespace java::lang;using namespace java::awt;int main(int argc, char **argv) {    JvCreateJavaVM(0);    Frame *f = new Frame(JvNewStringUTF("Hello World!"));    f->setLayout((LayoutManager *) new FlowLayout());    f->add(new Button(JvNewStringUTF("This is fantastic!")));    f->setVisible(true);}