java - 保存日志到mongo失败,乐观锁异常

问题描述

想把mongo保存进mongoDB中,使用的spring-boot-data-mongo.在dao层可以正常保存,但是写在service中报错:

org.springframework.dao.OptimisticLockingFailureException: Optimistic lock exception on saving entity: {_class=com.zihexin.base.mongo.MerchantRequestLog, version=1, requestIp=1111, requestDate=Tue Mar 21 17:15:01 CST 2017, requestParam=22222, paymentWay=213} to collection merchant_request_log at org.springframework.data.mongodb.core.MongoTemplate$12.doInCollection(MongoTemplate.java:1135) at org.springframework.data.mongodb.core.MongoTemplate$12.doInCollection(MongoTemplate.java:1108) at org.springframework.data.mongodb.core.MongoTemplate.execute(MongoTemplate.java:461) at org.springframework.data.mongodb.core.MongoTemplate.doUpdate(MongoTemplate.java:1108) at org.springframework.data.mongodb.core.MongoTemplate.doSaveVersioned(MongoTemplate.java:977) at org.springframework.data.mongodb.core.MongoTemplate.save(MongoTemplate.java:941) at org.springframework.data.mongodb.repository.support.SimpleMongoRepository.save(SimpleMongoRepository.java:78) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:483) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:468) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:440) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208) at com.sun.proxy.$Proxy84.save(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208) at com.sun.proxy.$Proxy84.save(Unknown Source) at com.zihexin.base.service.MongoService.saveRequestLog(MongoService.java:44) at com.zihexin.ZhxpayCommonApplicationTests.test4(ZhxpayCommonApplicationTests.java:72) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

service中代码:

@Servicepublic class MongoService { private static Logger logger = LoggerFactory.getLogger(MongoService.class); /**商户请求相关*/ //判断流水号重复或者为空 @Autowired MerchantRequestLogRepo merchantRequestLogRepo; public boolean exists(String requestId){return merchantRequestLogRepo.exists(requestId); } //异步保存mongo日志// @Async public void saveRequestLog(String ip,String paramMap, String requestId,String paymentWay){long start = System.currentTimeMillis();logger.info('Async Save Merchant Request Log Begin : ');MerchantRequestLog merchantRequestLog = new MerchantRequestLog();merchantRequestLog.setRequestDate(new Date());merchantRequestLog.setRequestId(requestId);merchantRequestLog.setRequestParam(paramMap);merchantRequestLog.setRequestIp(ip);merchantRequestLog.setPaymentWay(paymentWay);//merchantRequestLog.setHostIp(Constants.hostAddress);merchantRequestLogRepo.save(merchantRequestLog);logger.info('Async Save Merchant Request Log End ,Spend Time :{} ms',System.currentTimeMillis()-start); }

save()方法为继承MongoRepository中的方法,我改为insert()后就可以正常保存了,想不明白为什么,希望大家帮忙解答一下,谢谢!

问题解答

2点供考虑：

1，乐观锁主要是依靠version来处理冲突的，乐观锁的异常主要是：

1）Insert的时候发现待插入的数据，有更为新的version的数据了，因为有其他的同样的Insert的操作；2）Update的时候发现待修改的数据，有更为新的version的数据了，因为有其他的同样的Update的操作。这个需要检查一下应用需求，是否可以接受这种异常；如果接受不了，就需要进一步修改。

2，为什么Save不行，而Insert可以？请留意MongoDB中的Save和Insert的区别。

1）Save如果带_id，有可能是Update；2）Save如果不带_id，和Insert一样。简而言之，Save可以是一个Update操作。

供参考。

Love MongoDB！ Have Fun！