相关疑难解决方法(0)

我在@Transactional方法中提交事务时遇到问题:

methodA() {
    methodB()
}

@Transactional
methodB() {
    ...
    em.persist();
    ...
    em.flush();
    log("OK");
}

当我从methodA()调用methodB()时,该方法成功通过,我可以在日志中看到"OK".但后来我明白了

Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Transaction marked as rollbackOnly org.springframework.transaction.TransactionSystemException: Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Transaction marked as rollbackOnly
    at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:521)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:393)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:120)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:622)
    at methodA()...

1. 方法B的上下文在异常中完全丢失 - 我想这没关系？
2. methodB()中的某些内容将事务标记为仅回滚？我怎么能找到它？例如,有一种方法来检查类似的东西getCurrentTransaction().isRollbackOnly()?- 像这样我可以逐步完成方法并找到原因.