SQL错误：0，SQLState：08S01通信链接失败
我收到此错误（不常见）：
2013-05-08 16:44:35,786 WARN (JDBCExceptionReporter.java:100) [org.hibernate.util.JDBCExceptionReporter, logExceptions] - SQL Error: 0, SQLState: 08S01 2013-05-08 16:44:35,786 ERROR (JDBCExceptionReporter.java:101) [org.hibernate.util.JDBCExceptionReporter, logExceptions] - Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. 2013-05-08 16:44:35,833 ERROR (AdminDaoImpl.java:297) [com.myapp.admin.db.AdminDaoImpl, createFilePackage] - data-upload: Exception while adding new file package org.hibernate.exception.JDBCConnectionException: Cannot open connection at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:97) [hibernate-core-3.3.2.GA.jar:3.3.2.GA] at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) [hibernate-core-3.3.2.GA.jar:3.3.2.GA] at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52) [hibernate-core-3.3.2.GA.jar:3.3.2.GA] at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:449) [hibernate-core-3.3.2.GA.jar:3.3.2.GA] at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167) [hibernate-core-3.3.2.GA.jar:3.3.2.GA] at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:142) [hibernate-core-3.3.2.GA.jar:3.3.2.GA] at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:85) [hibernate-core-3.3.2.GA.jar:3.3.2.GA] at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1354) [hibernate-core-3.3.2.GA.jar:3.3.2.GA] at com.myapp.admin.db.AdminDaoImpl. createFilePackage(AdminDaoImpl.java:182) [AdminDaoImpl.class:na] at com.myapp.admin.ctrl.UploadController.processUploadZip(UploadController.java:217) [UploadController.class:na] at sun.reflect.GeneratedMethodAccessor106.invoke(Unknown Source) [na:na] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [na:1.6.0_35] at java.lang.reflect.Method.invoke(Method.java:597) [na:1.6.0_35] at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:212) [spring-web-3.1.0.RELEASE.jar:3.1.0.RELEASE] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126) [spring-web-3.1.0.RELEASE.jar:3.1.0.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) [servlet-api.jar:na] at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) [servlet-api.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) [catalina.jar:7.0.35] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [catalina.jar:7.0.35] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) [catalina.jar:7.0.35] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) [catalina.jar:7.0.35] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) [catalina.jar:7.0.35] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) [catalina.jar:7.0.35] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) [catalina.jar:7.0.35] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) [catalina.jar:7.0.35] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) [catalina.jar:7.0.35] at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:200) [tomcat-coyote.jar:7.0.35] at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) [tomcat-coyote.jar:7.0.35] at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) [tomcat-coyote.jar:7.0.35] at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [na:1.6.0_35] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [na:1.6.0_35] at java.lang.Thread.run(Thread.java:662) [na:1.6.0_35] Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure 我在共享服务器上托管了两个web（spring mvc + hibernate + mysql）应用程序：
1）主应用程序显示下载文件（通过管理员应用程序插入）
2）具有CRUD操作的管理员应用程序
这个错误出现在某个时候，当我使用“admin”应用程序上传“main”应用程序的文件时，假设可能是在成功上传/处理大约100-120个文件/请求之后以及每次请求命中数据库时使用10-20个插入/更新查询。
托管详情：
Private tomcat hosting java 1.6.0_35-b10 tomcat 7.0.35 heap size 288MB MySQL Server 5 commons-dbcp 1.2.2 mysql-connector-java 5.1.9
数据库+ Hibernate + DBCP属性：
hibernate.dialect=org.hibernate.dialect.MySQLDialect hibernate.hbm2ddl.auto=none hibernate.jdbc.batch_size=100 hibernate.show_sql=false hibernate.format_sql=false hibernate.cache.use_second_level_cache=true hibernate.cache.use_query_cache=false hibernate.cache.provider_class=org.hibernate.cache.NoCacheProvider hibernate.current_session_context_class=thread
有关代码：
public String createFilePackage(FilePackage package) { String message = ""; Session session = getSessionFactory().openSession(); Transaction tx = null; try { tx = session.beginTransaction(); // handling package, around 10-14 DB insert, 10 SELECT and 5 update queries on same session tx.commit(); } catch(Exception e) { logger.error("file-upload: Exception while adding new font package", e); if(tx != null) { tx.rollback(); } } finally { session.close(); } return message; }
任何建议如何解决这个问题？
在function完成处理之前，驱动程序与驱动程序尝试连接的数据源之间的通信链接失败。 所以通常是网络错误。 这可能是由数据包丢失或配置错误的防火墙/交换机引起的。
检查服务器配置文件/etc/mysql/my.cnf – validationbind_address未设置为127.0.0.1 。 将其设置为0.0.0.0或将其注释掉然后重新启动服务器：
sudo service mysql restart
可能是由于TCP协议已关闭。
如何检查/启用： https ： //dba.stackexchange.com/questions/11377/cannot-connect-to-ms-sql-2008-r2-by-dbvisualizer-native-sspi-library-not-loade/144097# 144097
连接超时会发生此错误