spring事务失效原因总结

1.调用的方法不是 public 的：

  spring官方文档说明如下：When using proxies, you should apply the @Transactional annotation only to methods with public visibility. If you do annotate protected, private or package-visible methods with the @Transactional annotation, no error is raised, but the annotated method does not exhibit the configured transactional settings. Consider the use of AspectJ (see below) if you need to annotate non-public methods.

2.自身调用问题：

示例：方法methodB调用方法methodA，方法methodA添加了事务，事务也不会生效。

@Transactional
public void methodA() throws Exception {
        throw new RuntimeException();
    }

    /**
     * 这里调用methodA() 的事务将会失效
     */
//    @Transactional
//    @Transactional(rollbackFor = Exception.class)
 public void methodB() throws Exception {
        this.methodA();
    }

3.捕捉异常没有抛出，事务不生效。

@Transactional
public void methodA() throws Exception {
        int id = 1;
        try {
            Test t = new Test();
            t.setId(id);
            t.setName("3");
            m.updateById(t);
            throw new Exception();
        } catch (Exception e) {
            e.printStackTrace();
//            throw new Exception();
//            throw new RuntimeException();

        } finally {
            Test test = m.selectById(id);
            log.info("test={}", m.selectById(id));
        }

    }

4.捕捉异常后， 抛出非RuntimeException异常，事务不生效，需要配置 @Transactional(rollbackFor = Exception.class)即可生效

@Transactional
public void methodA() throws Exception {
        int id = 1;
        try {
            Test t = new Test();
            t.setId(id);
            t.setName("3");
            m.updateById(t);
            throw new Exception();
        } catch (Exception e) {
            e.printStackTrace();
            throw new Exception();
//            throw new RuntimeException();

        } finally {
            Test test = m.selectById(id);
            log.info("test={}", m.selectById(id));
        }
//        throw new RuntimeException();

    }