BlogJava-Java之旅-文章分类-Tomcathttp://www.blogjava.net/hoocoral/category/18351.htmlRecord my Java-learning process.zh-cnMon, 14 Apr 2008 11:21:09 GMTMon, 14 Apr 2008 11:21:09 GMT60数据库连接池自动重新连接问题(转)http://www.blogjava.net/hoocoral/articles/192684.html胡昆荣胡昆荣Mon, 14 Apr 2008 02:42:00 GMThttp://www.blogjava.net/hoocoral/articles/192684.htmlhttp://www.blogjava.net/hoocoral/comments/192684.htmlhttp://www.blogjava.net/hoocoral/articles/192684.html#Feedback0http://www.blogjava.net/hoocoral/comments/commentRss/192684.htmlhttp://www.blogjava.net/hoocoral/services/trackbacks/192684.html
在以往的开发中，常常遇到tomcat连接池断掉后(比如网络断线)，无法自动重新连接，导致数据库连接始终无效，今天发现此问题的一个解决方案。
首先，在连接池的配置中(XXX.XML)，DB的url后加上参数，如sqlserver的加;autoReconnect=true，这是自动重连的基础保证。
其次，一定要在tomcat中抛出连接异常，这一点很重要。一般我们的连接都会用class封装起来，一场也会在class中捕获，并处理掉，这样会导致连接无法自动恢复。估计tomcat所带的dbcp连接池的重连机制是捕获tomcat中抛出的连接异常再重新连接，所以，连接异常一定要被抛出而不是自行处理掉。否则连接池会无法重新连接。
所以，实现tomcat自带连接池dbcp自动重连的解决方案是，1。加上autoReconnect=true的参数  2。连接异常要被抛出

胡昆荣 2008-04-14 10:42 发表评论
]]>Tomcat中access denied错误的解决方法http://www.blogjava.net/hoocoral/articles/130720.html胡昆荣胡昆荣Tue, 17 Jul 2007 01:35:00 GMThttp://www.blogjava.net/hoocoral/articles/130720.htmlhttp://www.blogjava.net/hoocoral/comments/130720.htmlhttp://www.blogjava.net/hoocoral/articles/130720.html#Feedback0http://www.blogjava.net/hoocoral/comments/commentRss/130720.htmlhttp://www.blogjava.net/hoocoral/services/trackbacks/130720.html在Eclipse中构建J2EE项目时，Tomcat出现access denied错误，不能正常启动Tomcat：

STACKTRACE:

java.net.SocketException: java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:3306 connect,resolve)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:156)
at com.mysql.jdbc.MysqlIO.(MysqlIO.java:276)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2641)
at com.mysql.jdbc.Connection.(Connection.java:1531)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.s.util.logic.DBconn.initiconn(DBconn.java:68)
at com.s.util.logic.DBconn.(DBconn.java:50)
at com.s.util.logic.SimpDB.(SimpDB.java:20)
at com.s.p.ui.LoginServlet.doGet(LoginServlet.java:40)
at com.s.p.ui.LoginServlet.doPost(LoginServlet.java:153)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:239)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAsPrivileged(Unknown Source)
at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:268)
at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:157)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:50)
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:140)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:136)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Unknown Source

解决方法：
在Eclipse配置里面，windows-->Preferences-->Tomcat-->advanced，把"Launch tomcat using Security Manager"选项的勾去掉，重新启动Tomcat。
可以解决问题。



胡昆荣 2007-07-17 09:35 发表评论
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