mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Class", "forName",
"(Ljava/lang/String;)Ljava/lang/Class;");
mv.visitLabel(l1);
mv.visitInsn(ARETURN);
mv.visitLabel(l2);
mv.visitMethodInsn(INVOKEVIRTUAL,
"java/lang/ClassNotFoundException", "getMessage",
"()Ljava/lang/String;");
mv.visitVarInsn(ASTORE, 1);
mv.visitTypeInsn(NEW, "java/lang/NoClassDefFoundError");