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Urgent problem: jboss as 5.1 offten happened time out exception
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created by <a href="https://community.jboss.org/people/aquila_bj">jiang hongyu</a> in <i>Datasource Configuration</i> - <a href="https://community.jboss.org/message/731223#731223">View the full discussion</a>
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<div class="jive-rendered-content"><p>helllo every one, I have some urgent problem about JBOSS db pool with mysql database(5.1.41). I offen found my sql exception from jboss as server. Does anybody find the same error problem before, how to fix this problem. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Can anybody help to find what's root cause about this?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>2012-04-20 11:29:17,189 WARN  [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] Unable to fill pool </p><p>org.jboss.resource.JBossResourceException: Could not create connection; - nested throwable: (com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The last packet successfully received from the server was 6,128 milliseconds ago.  The last packet sent successfully to the server was 6,127 milliseconds ago.)</p><p>        at org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory.getXAManagedConnection(XAManagedConnectionFactory.java:465)</p><p>        at org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory.createManagedConnection(XAManagedConnectionFactory.java:409)</p><p>        at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.createConnectionEventListener(InternalManagedConnectionPool.java:633)</p><p>        at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.fillToMin(InternalManagedConnectionPool.java:541)</p><p>        at org.jboss.resource.connectionmanager.PoolFiller.run(PoolFiller.java:74)</p><p>        at java.lang.Thread.run(Thread.java:619)</p><p>Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The last packet successfully received from the server was 6,128 milliseconds ago.  The last packet sent successfully to the server was 6,127 milliseconds ago.</p><p>        at sun.reflect.GeneratedConstructorAccessor219.newInstance(Unknown Source)</p><p>        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)</p><p>        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)</p><p>        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)</p><p>        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)</p><p>        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3591)</p><p>        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3480)</p><p>        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4021)</p><p>        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:951)</p><p>        at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:4602)</p><p>        at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1328)</p><p>        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2389)</p><p>        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2422)</p><p>        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2207)</p><p>        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:797)</p><p>        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)</p><p>        at sun.reflect.GeneratedConstructorAccessor125.newInstance(Unknown Source)</p><p>        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)</p><p>        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)</p><p>        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)</p><p>        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:389)</p><p>        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)</p><p>        at com.mysql.jdbc.jdbc2.optional.MysqlDataSource.getConnection(MysqlDataSource.java:440)</p><p>        at com.mysql.jdbc.jdbc2.optional.MysqlDataSource.getConnection(MysqlDataSource.java:138)</p><p>        at com.mysql.jdbc.jdbc2.optional.MysqlDataSource.getConnection(MysqlDataSource.java:108)</p><p>        at com.mysql.jdbc.jdbc2.optional.MysqlXADataSource.getXAConnection(MysqlXADataSource.java:48)</p><p>        at org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory.getXAManagedConnection(XAManagedConnectionFactory.java:449)</p><p>        ... 5 more</p><p>Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.</p><p>        at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3041)</p><p>        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3491)</p><p>        ... 26 more</p></div>
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