問(wèn)題描述

想把mongo保存進(jìn)mongoDB中,使用的spring-boot-data-mongo.在dao層可以正常保存,但是寫在service中報(bào)錯(cuò):

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中代碼:

@Servicepublic class MongoService { private static Logger logger = LoggerFactory.getLogger(MongoService.class); /**商戶請(qǐng)求相關(guān)*/ //判斷流水號(hào)重復(fù)或者為空 @Autowired MerchantRequestLogRepo merchantRequestLogRepo; public boolean exists(String requestId){return merchantRequestLogRepo.exists(requestId); } //異步保存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()方法為繼承MongoRepository中的方法,我改為insert()后就可以正常保存了,想不明白為什么,希望大家?guī)兔獯鹨幌?謝謝!

問(wèn)題解答

2點(diǎn)供考慮：

1，樂(lè)觀鎖主要是依靠version來(lái)處理沖突的，樂(lè)觀鎖的異常主要是：

1）Insert的時(shí)候發(fā)現(xiàn)待插入的數(shù)據(jù)，有更為新的version的數(shù)據(jù)了，因?yàn)橛衅渌耐瑯拥腎nsert的操作；2）Update的時(shí)候發(fā)現(xiàn)待修改的數(shù)據(jù)，有更為新的version的數(shù)據(jù)了，因?yàn)橛衅渌耐瑯拥腢pdate的操作。這個(gè)需要檢查一下應(yīng)用需求，是否可以接受這種異常；如果接受不了，就需要進(jìn)一步修改。

2，為什么Save不行，而Insert可以？請(qǐng)留意MongoDB中的Save和Insert的區(qū)別。

1）Save如果帶_id，有可能是Update；2）Save如果不帶_id，和Insert一樣。簡(jiǎn)而言之，Save可以是一個(gè)Update操作。

供參考。

Love MongoDB！ Have Fun！