String sourceFileName = factory.substring(factory.lastIndexOf('.')+1, factory.length()) + ".java";
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER, classFilePath, null, "java/lang/Object", new String[]{"org/hibernate/transaction/TransactionManagerLookup"});
cw.visitSource(sourceFileName, null);
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);