ttl2-compatible/src/main/java/com/alibaba/ttl/threadpool/agent/transformlet/internal/TimerTaskTtlTransformlet.java [29:55]:
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    public void doTransform(@NonNull final ClassInfo classInfo) throws IOException, NotFoundException, CannotCompileException {
        // work-around ClassCircularityError:
        if (isClassAtPackageJavaUtil(classInfo.getClassName())) return;

        // TimerTask class is checked by above logic.
        //
        // if (TIMER_TASK_CLASS_NAME.equals(classInfo.getClassName())) return; // No need transform TimerTask class

        final CtClass clazz = classInfo.getCtClass();

        if (clazz.isPrimitive() || clazz.isArray() || clazz.isInterface() || clazz.isAnnotation()) {
            return;
        }
        // class contains method `void run()` ?
        try {
            final CtMethod runMethod = clazz.getDeclaredMethod(RUN_METHOD_NAME, new CtClass[0]);
            if (!CtClass.voidType.equals(runMethod.getReturnType())) return;
        } catch (NotFoundException e) {
            return;
        }
        if (!clazz.subclassOf(clazz.getClassPool().get(TIMER_TASK_CLASS_NAME))) return;

        logger.info("Transforming class " + classInfo.getClassName());

        updateTimerTaskClass(clazz);
        classInfo.setModified();
    }
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ttl-agent/src/main/java/com/alibaba/ttl3/agent/transformlet/internal/TimerTaskTtlTransformlet.java [29:55]:
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    public void doTransform(@NonNull final ClassInfo classInfo) throws IOException, NotFoundException, CannotCompileException {
        // work-around ClassCircularityError:
        if (isClassAtPackageJavaUtil(classInfo.getClassName())) return;

        // TimerTask class is checked by above logic.
        //
        // if (TIMER_TASK_CLASS_NAME.equals(classInfo.getClassName())) return; // No need transform TimerTask class

        final CtClass clazz = classInfo.getCtClass();

        if (clazz.isPrimitive() || clazz.isArray() || clazz.isInterface() || clazz.isAnnotation()) {
            return;
        }
        // class contains method `void run()` ?
        try {
            final CtMethod runMethod = clazz.getDeclaredMethod(RUN_METHOD_NAME, new CtClass[0]);
            if (!CtClass.voidType.equals(runMethod.getReturnType())) return;
        } catch (NotFoundException e) {
            return;
        }
        if (!clazz.subclassOf(clazz.getClassPool().get(TIMER_TASK_CLASS_NAME))) return;

        logger.info("Transforming class " + classInfo.getClassName());

        updateTimerTaskClass(clazz);
        classInfo.setModified();
    }
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