com.mysql.jdbc.CommunicationsException这个错误是什么原因引起的
我用的是MYSQL +Resin
程序运行了一段时间后，就偶然会报出下面的错误：
[2007-03-31 22:49:33] com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
[2007-03-31 22:49:33]
[2007-03-31 22:49:33] ** BEGIN NESTED EXCEPTION **
[2007-03-31 22:49:33]
[2007-03-31 22:49:33] java.io.EOFException
[2007-03-31 22:49:33]
[2007-03-31 22:49:33] STACKTRACE:
[2007-03-31 22:49:33]
[2007-03-31 22:49:33] java.io.EOFException
[2007-03-31 22:49:33] at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1913)
[2007-03-31 22:49:33] at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2304)
[2007-03-31 22:49:33] at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2803)
[2007-03-31 22:49:33] at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1573)
[2007-03-31 22:49:33] at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1665)
[2007-03-31 22:49:33] at com.mysql.jdbc.Connection.execSQL(Connection.java:3176)
[2007-03-31 22:49:33] at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1153)
[2007-03-31 22:49:33] at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1266)
[2007-03-31 22:49:33] at com.caucho.sql.UserPreparedStatement.executeQuery(UserPreparedStatement.java:108)
[2007-03-31 22:49:33] at com.caucho.sql.UserPreparedStatement.executeQuery(UserPreparedStatement.java:108)
[2007-03-31 22:49:33] at ayou.db.BASE.getDataWithException(BASE.java:301)
[2007-03-31 22:49:33] at ayou.db.BASE.getData(BASE.java:274)
[2007-03-31 22:49:33] at com.tom.tech.cms.analytics.ArticleIndexdb.getNewListAll(ArticleIndexdb.java:42)
[2007-03-31 22:49:33] at com.tom.tech.cms.analytics.BackupActicle.getNewList(BackupActicle.java:46)
[2007-03-31 22:49:33] at com.tom.tech.cms.analytics.BackupActicle.setAllNewList(BackupActicle.java:60)
[2007-03-31 22:49:33] at _jsp._analytics._test__jsp._jspService(_test__jsp.java:41)
[2007-03-31 22:49:33] at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
[2007-03-31 22:49:33] at com.caucho.jsp.Page.pageservice(Page.java:570)
[2007-03-31 22:49:33] at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
[2007-03-31 22:49:33] at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:173)
[2007-03-31 22:49:33] at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
[2007-03-31 22:49:33] at com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:420)
[2007-03-31 22:49:33] at com.caucho.server.port.TcpConnection.run(TcpConnection.java:511)
[2007-03-31 22:49:33] at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:520)
[2007-03-31 22:49:33] at com.caucho.util.ThreadPool.run(ThreadPool.java:442)
[2007-03-31 22:49:33] at java.lang.Thread.run(Thread.java:595)
[2007-03-31 22:49:33]
[2007-03-31 22:49:33]
[2007-03-31 22:49:33] ** END NESTED EXCEPTION **
[2007-03-31 22:49:33]
[2007-03-31 22:49:33]
[2007-03-31 22:49:33]
[2007-03-31 22:49:33] Last packet sent to the server was 1 ms ago.
[2007-03-31 22:49:33] at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2515)
[2007-03-31 22:49:33] at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2803)
[2007-03-31 22:49:33] at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1573)
[2007-03-31 22:49:33] at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1665)
[2007-03-31 22:49:33] at com.mysql.jdbc.Connection.execSQL(Connection.java:3176)
[2007-03-31 22:49:33] at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1153)
[2007-03-31 22:49:33] at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1266)
[2007-03-31 22:49:33] at com.caucho.sql.UserPreparedStatement.executeQuery(UserPreparedStatement.java:108)
[2007-03-31 22:49:33] at com.caucho.sql.UserPreparedStatement.executeQuery(UserPreparedStatement.java:108)
[2007-03-31 22:49:33] at ayou.db.BASE.getDataWithException(BASE.java:301)
[2007-03-31 22:49:33] at ayou.db.BASE.getData(BASE.java:274)
[2007-03-31 22:49:33] at com.tom.tech.cms.analytics.ArticleIndexdb.getNewListAll(ArticleIndexdb.java:42)
[2007-03-31 22:49:33] at com.tom.tech.cms.analytics.BackupActicle.getNewList(BackupActicle.java:46)
[2007-03-31 22:49:33] at com.tom.tech.cms.analytics.BackupActicle.setAllNewList(BackupActicle.java:60)
[2007-03-31 22:49:33] at _jsp._analytics._test__jsp._jspService(_test__jsp.java:41)
[2007-03-31 22:49:33] at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
[2007-03-31 22:49:33] at com.caucho.jsp.Page.pageservice(Page.java:570)
[2007-03-31 22:49:33] at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
[2007-03-31 22:49:33] at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:173)
[2007-03-31 22:49:33] at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
[2007-03-31 22:49:33] at com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:420)
[2007-03-31 22:49:33] at com.caucho.server.port.TcpConnection.run(TcpConnection.java:511)
[2007-03-31 22:49:33] at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:520)
[2007-03-31 22:49:33] at com.caucho.util.ThreadPool.run(ThreadPool.java:442)
[2007-03-31 22:49:33] at java.lang.Thread.run(Thread.java:595)
请问这是怎么会事啊，是什么原因引起的
为什么有时候会报，有时候又正常了呢？
[解决办法]
在mysql关闭连接之前关闭自己持有的链接
------解决方案--------------------
我也遇到同样的问题 ,束手无策
[解决办法]
我也是遇到了这个问题，唯一的办法是先重新启动服务器了！
呵呵
8h后启动一次，晕死了
[解决办法]
难道是Resin对连接池支持不好？
