org.springframework.dao.CannotAcquireLockException 的解决》
直接上 bug 的详细信息：
2012-03-12 15:20:31 XmlBeanDefinitionReader [INFO] Loading XML bean definitions from class path resource [org/springframework/jdbc/support/sql-error-codes.xml] 2012-03-12 15:20:31 SQLErrorCodesFactory [INFO] SQLErrorCodes loaded: [DB2, Derby, H2, HSQL, Informix, MS-SQL, MySQL, Oracle, PostgreSQL, Sybase] 2012-03-12 15:20:31 ExceptionUtil [ERROR] SqlMapClient operation; SQL []; --- The error occurred in com/defonds/syncpath/dao/operation.xml. --- The error occurred while applying a parameter map. --- Check the operation.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/operation.xml. --- The error occurred while applying a parameter map. --- Check the operation.updateShareStatus-InlineParameterMap. --- Check the statement (update failed). --- Cause: java.sql.SQLException: Lock wait timeout exceeded; try restarting transaction org.springframework.dao.CannotAcquireLockException: SqlMapClient operation; SQL []; --- The error occurred in com/defonds/syncpath/dao/operation.xml. --- The error occurred while applying a parameter map. --- Check the operation.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/operation.xml. --- The error occurred while applying a parameter map. --- Check the operation.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.operation.impl.OperationServiceImpl.revokeSharedFolder(OperationServiceImpl.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)
分析原因：
Spring 事务嵌套造成死锁。FileServiceImpl 里嵌入了 OperationService：
private OperationService operationService;
FileServiceImpl 的 delete 方法里对 MySQL 的 file 表有操作，而 OperationService 里的 revokeSharedFolder 方法也对同一张表有更新操作。事务嵌套，造成死锁。
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
@Override
public void delete(int uid, int[] itemIds) {
if (itemIds != null && itemIds.length > 0) {
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时间： 2024-10-05 23:54:33