Spring管理事务默认回滚的异常是什么?
问题:
Spring管理事务默认(即没有rollBackFor的情况下)可以回滚的异常是什么?
回答:
RuntimeException或者Error。
抛出运行时异常,是否回滚?Yes
@Transactional public boolean rollbackOn(Throwable ex) { return new RuntimeException(); }
抛出错误,是否回滚? Yes
@Transactional public void testTransationB(){ throw new Error(); }
抛出非运行时异常,是否回滚? No
@Transactional public void testTransationC() throws Exception{ throw new Exception(); }
抛出非运行时异常,有rollBackFor=Exception.class的情况下,是否回滚? Yes
@Transactional(rollbackFor = Exception.class) public void testTransationD() throws Exception{ throw new Exception(); }
分析:
请看Spring源码类RuleBasedTransactionAttribute:
public boolean rollbackOn(Throwable ex) { if (logger.isTraceEnabled()) { logger.trace("Applying rules to determine whether transaction should rollback on " + ex); } RollbackRuleAttribute winner = null; int deepest = Integer.MAX_VALUE; if (this.rollbackRules != null) { for (RollbackRuleAttribute rule : this.rollbackRules) { int depth = rule.getDepth(ex); if (depth >= 0 && depth < deepest) { deepest = depth; winner = rule; } } } if (logger.isTraceEnabled()) { logger.trace("Winning rollback rule is: " + winner); } // User superclass behavior (rollback on unchecked) if no rule matches. if (winner == null) { logger.trace("No relevant rollback rule found: applying default rules"); return super.rollbackOn(ex); } return !(winner instanceof NoRollbackRuleAttribute); }
其中
ex:程序运行中抛出的异常,可以是Exception,RuntimeException,Error;
rollbackRules:代表rollBackFor指定的异常。默认情况下是empty。
所以默认情况下,winner等于null,程序调用super.rollbackOn(ex)
Here is the source code of super.rollbackOn(ex)
public boolean rollbackOn(Throwable ex) { return (ex instanceof RuntimeException || ex instanceof Error); }
真相大白,结论是,默认情况下,如果是RuntimeException或Error的话,就返回True,表示要回滚,否则返回False,表示不回滚。
有rollBackFor的情况就不分析啦,这个也是可以触类旁通的。
转载:https://blog.csdn.net/lu930124/article/details/77596045
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