public void test() throws Exception {
ClassWriter clssWriter = new ClassWriter(Constants.V1_5, Constants.ACC_PUBLIC, "x/Example", "java/lang/Object", null);
ASMUtil.visitConstructor(clssWriter);
MethodWriter m = clssWriter.visitMethod(ACC_PUBLIC, "test", "([Ljava/lang/Object;)Ljava/lang/Object;", null);
Label toExcaption = new Label();
m.visitVarInsn(Constants.ALOAD, 1);
m.visitJumpInsn(Constants.IFNULL, toExcaption);
m.visitVarInsn(Constants.ALOAD, 1);