異常信息： 出現了不可預知的回滾異常，因爲事務已經被標誌位只能回滾，所以事務回滾了。
org.springframework.transaction.UnexpectedRollbackException: Transaction rolled back because it has been marked as rollback-only
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:724)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:485)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:291)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)
at com.sun.proxy.$Proxy98.evaluateScript(Unknown Source)
at com.mdiaf.baf.action.BafConsoleController.eval(BafConsoleController.java:32)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:969)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:871)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:845)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.mdiaf.webapp.filter.BafPostAuthFilter.continueFilter(BafPostAuthFilter.java:76)
at com.mdiaf.webapp.filter.BafPostAuthFilter.doFilterInternal(BafPostAuthFilter.java:58)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:316)
at org.springframework.security.web.authentication.switchuser.SwitchUserFilter.doFilter(SwitchUserFilter.java:193)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:122)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:157)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:169)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:48)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:205)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:120)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:53)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:91)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:213)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:176)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.mdiaf.webapp.filter.BafPreAuthFilter.doFilterInternal2(BafPreAuthFilter.java:119)
at com.mdiaf.webapp.filter.BafPreAuthFilter.doFilterInternal(BafPreAuthFilter.java:70)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.web.multipart.support.MultipartFilter.doFilterInternal(MultipartFilter.java:118)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.mdiaf.webapp.filter.GZIPFilter.doFilter(GZIPFilter.java:28)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Spring事務傳播機制彙總如下：
- PROPAGATION_REQUIRED：如果當前沒有事務，就新建一個事務，如果已經存在一個事務，就加入到這個事務中。默認策略
- PROPAGATION_SUPPORTS：支持當前事務，如果當前沒有事務，就以非事務方式執行。
- PROPAGATION_MANDATORY：使用當前的事務，如果當前沒有事務，就拋出異常。
- PROPAGATION_REQUIRES_NEW：新建事務，如果當前存在事務，把當前事務掛起。
- PROPAGATION_NOT_SUPPORTED：以非事務方式執行操作，如果當前存在事務，就把當前事務掛起。
- PROPAGATION_NEVER：以非事務方式執行，如果當前存在事務，則拋出異常。
- PROPAGATION_NESTED：如果當前存在事務，則在嵌套事務內執行。如果當前沒有事務，則執行與PROPAGATION_REQUIRED類似的操作。
nested 的子異常拋出 如果被catch 外部插入成功
nested 的子異常拋出 如果不被catch 外部插入失敗
nested外面異常拋出 nest內部插入成功 nest也會跟着回滾
spring事務默認的傳播行爲：
@Transactional 等於 @Transactional(propagation=Propagation.REQUIRED)
發生異常的場景描述：
在使用Spring事務時，在一個事務A中又開了一個事務B（即存在嵌套事務），當事務B發生異常時，將異常catch後事務B會進行回滾操作，若此時異常被直接喫掉（即事務A無法得知發生過異常），則事務A會拋出如上異常。
serviceA有事務 @Transactional
serviceB有事務 @Transactional
serviceA.methodA()
{
doSomethingA();
try {
serviceB.methodB{}; //這裏面有異常標記爲回滾, doSetRollbackOnly(status);
}
catch {
//捕獲異常轉到commit時，由於已經標記爲要回滾， 回滾並拋出新異常
}
doSomethingB();
}
原因：
因爲methodB的傳播屬性設置爲PROPAGATION_REQUIRED，PROPAGATION_REQUIRED的意思是，當前有事務，則使用當前事務，當前無事務則創建事務。由於methodA的傳播屬性也爲PROPAGATION_REQUIRED，所以methodA會創建一個事務，然後methodB與methodA使用同一個事務，methodB出現異常後，將當前事務標誌位回滾，由於在methodA中做了trycatch處理，程序沒有終止而是繼續往下走，當事務commit時，check狀態，發現，需要事務回滾，所以纔會出現不可預知的事務異常:因爲事務被標誌位回滾，所以事務回滾。
也就是說:methodA與methodB共用一個事務，methodB將事務標誌爲回滾，methodA中commit這個事務，然後，出現事務已經被標誌回滾（methodB標誌的）的異常信息。
解決方案
情況1：methodA與methodB在邏輯上不應該屬於同一個事務，那麼將methodB的事務傳播屬性修改爲PROPAGATION_REQUIRES_NEW，這樣，執行methodB時，會創建一個新的事務，不影響methodA中的事務。
情況2：業務A與業務B在業務邏輯上就應該屬於同一個事務，那麼將methodA中的try catch去掉
情況3：業務A與業務B在業務邏輯上就應該屬於同一個事務，但是methodB的失敗與否不能影響methodA的事務提交，那麼仍然在methodA中try catch methodB,並將methodB設置爲PROPAGATION_NESTED，它的意思是，methodB是一個子事務，有一個savepoint，失敗時會回滾到savepoint，不影響methodA，如果成功則A、B一起提交，A與B都是一個事務，只是B是一個子事務。
情況4：業務A 有無事務無影響 去掉業務A的@Transactional
小結：
- 深入理解事務傳播的各個狀態含義，比如PROPAGATION_REQUIRED、PROPAGATION_SUPPORTS、PROPAGATION_MANDATORY、PROPAGATION_REQUIRES_NEW等
- 最初我以爲是由於spring配置文件中，methodA的事務設置爲ready-only=true(只讀事務)的原因，經過查詢資料得知，只讀事務與事務傳播不衝突，是兩個機制。只讀事務，是一個特殊的事務，該事務內，只能是查詢語句，不能含有修改、更新語句，數據庫可能對只讀事務做優化；傳播屬性是母方法與子方法之間的關係表達。
- 注意，同一個類中，事務嵌套以最外層的方法爲準，嵌套的事務失效；不同類中嵌套的事務纔會生效；