Spring之—— java.sql.SQLException: Lock wait timeout exceeded | CannotAcquireLockException 的解决

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一、错误信息

错误日志如下：

2017-11-23 15:20:31 XmlBeanDefinitionReader [INFO] Loading XML bean definitions from class path resource [org/springframework/jdbc/support/sql-error-codes.xml]2017-11-23 15:20:31 SQLErrorCodesFactory [INFO] SQLErrorCodes loaded: [DB2, Derby, H2, HSQL, Informix, MS-SQL, MySQL, Oracle, PostgreSQL, Sybase]2017-11-23 15:20:31 ExceptionUtil [ERROR] SqlMapClient OrderItem; SQL [];   --- The error occurred in com/defonds/syncpath/dao/OrderItem.xml.  --- The error occurred while applying a parameter map.  --- Check the OrderItem.updateShareStatus-InlineParameterMap.  --- Check the statement (update failed).  --- Cause: java.sql.SQLException: Lock wait timeout exceeded; try restarting transaction; nested exception is com.ibatis.common.jdbc.exception.NestedSQLException:   --- The error occurred in com/defonds/syncpath/dao/OrderItem.xml.  --- The error occurred while applying a parameter map.  --- Check the OrderItem.updateShareStatus-InlineParameterMap.  --- Check the statement (update failed).  --- Cause: java.sql.SQLException: Lock wait timeout exceeded; try restarting transactionorg.springframework.dao.CannotAcquireLockException: SqlMapClient OrderItem; SQL [];   --- The error occurred in com/defonds/syncpath/dao/OrderItem.xml.  --- The error occurred while applying a parameter map.  --- Check the OrderItem.updateShareStatus-InlineParameterMap.  --- Check the statement (update failed).  --- Cause: java.sql.SQLException: Lock wait timeout exceeded; try restarting transaction; nested exception is com.ibatis.common.jdbc.exception.NestedSQLException:   --- The error occurred in com/defonds/syncpath/dao/OrderItem.xml.  --- The error occurred while applying a parameter map.  --- Check the OrderItem.updateShareStatus-InlineParameterMap.  --- Check the statement (update failed).  --- Cause: java.sql.SQLException: Lock wait timeout exceeded; try restarting transaction  at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:244)  at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)  at org.springframework.orm.ibatis.SqlMapClientTemplate.execute(SqlMapClientTemplate.java:212)  at com.defonds.frameworkcommons.dao.BaseDaoImpl.execute(BaseDaoImpl.java:31)  at com.defonds.frameworkcommons.dao.BaseDaoImpl.update(BaseDaoImpl.java:97)  at com.defonds.syncpath.service.OrderItem.impl.OrderItemServiceImpl.revokeSharedFolder(OrderItemServiceImpl.java:287)  at com.defonds.syncpath.service.share.impl.ShareServiceImpl.handleRevokeSharedFolder(ShareServiceImpl.java:312)  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)  at java.lang.reflect.Method.invoke(Method.java:597)  at com.defonds.interfaceframework.controller.Action.invokeMethod(Action.java:256)  at com.defonds.interfaceframework.controller.Action.execute(Action.java:206)  at com.defonds.interfaceframework.controller.DispatcherServlet.service(DispatcherServlet.java:144)  at com.defonds.syncpath.common.ArcSyncDispatcherServlet.service(ArcSyncDispatcherServlet.java:51)  at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)  at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)  at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)  at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)  at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)  at java.lang.Thread.run(Thread.java:619)

二、分析原因

Spring 事务嵌套造成死锁。OrderServiceImpl 里嵌入了 OrderItemService：

private OrderItemService orderItemService;

OrderServiceImpl 的 delete 方法里对 MySQL 的 Order 表有操作，而 OrderItemService 里的 revokeSharedFolder 方法也对同一张表有更新操作。事务嵌套，造成死锁。

三、解决方案

当前调用事务的方法设置为 Propagation.SUPPORTS：

@Transactional(propagation=Propagation.SUPPORTS)//by Defonds,for BUG094537@Overridepublic void delete(int uid, int[] itemIds) {  if (itemIds != null && itemIds.length > 0) {