Hello,

I'm having a problem where it seems Tomcat and MySQL go out of sync and I am
no longer able to connect to the MySQL database. The only way I've found to
be able to reconnect to my database is to restart Tomcat. This generally
seems to happen some time over the course of the night and I notice the
problem when I check on things in the morning, but it doesn't seem to happen
every time.

Does anyone have any idea what may be causing this and how to fix it?

Here is a list of what I'm using:

Tomcat 5.5.17
MySQL 14.12
Hibernate 3.2
mysql-connector-java-5.0.4
JAVA 1.5
Windows XP Pro


[Jan 29 2007 (Mon)9:30:56 EST] ERROR [http-8888-Processor20](
org.hibernate.util.JDBCExceptionReporter) - No operations allowed after
connection closed.Connection was implicitly closed due to underlying
exception/error:


** BEGIN NESTED EXCEPTION **

com.mysql.jdbc.CommunicationsException
MESSAGE: Communications link failure due to underlying exception:

** BEGIN NESTED EXCEPTION **

java.net.SocketException
MESSAGE: Software caused connection abort: socket write error

STACKTRACE:

java.net.SocketException: Software caused connection abort: socket write
error
  at java.net.SocketOutputStream.socketWrite0(Native Method)
  at java.net.SocketOutputStream.socketWrite (SocketOutputStream.java:92)
  at java.net.SocketOutputStream.write (SocketOutputStream.java:136)
  at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java
:65)
  at java.io.BufferedOutputStream.flush (BufferedOutputStream.java:123)
  at com.mysql.jdbc.MysqlIO.send (MysqlIO.java:2637)
  at com.mysql.jdbc.MysqlIO.sendCommand (MysqlIO.java:1554)
  at com.mysql.jdbc.MysqlIO.sqlQueryDirect (MysqlIO.java:1665)
  at com.mysql.jdbc.Connection.execSQL (Connection.java:3176)
  at com.mysql.jdbc.PreparedStatement.executeInternal(
PreparedStatement.java:1153)
  at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java
:1266)
  at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java
:186)
  at org.hibernate.loader.Loader.getResultSet (Loader.java:1778)
  at org.hibernate.loader.Loader.doQuery (Loader.java:662)
  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(
Loader.java:224)
  at org.hibernate.loader.Loader.doList (Loader.java:2211)
  at org.hibernate.loader.Loader.listIgnoreQueryCache (Loader.java:2095)
  at org.hibernate.loader.Loader.list (Loader.java:2090)
  at org.hibernate.loader.hql.QueryLoader.list (QueryLoader.java:388)
  at org.hibernate.hql.ast.QueryTranslatorImpl.list(
QueryTranslatorImpl.java:338)
  at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java
:172)
  at org.hibernate.impl.SessionImpl.list (SessionImpl.java:1121)
  at org.hibernate.impl.QueryImpl.list (QueryImpl.java:79)
  at org.hibernate.impl.AbstractQueryImpl.uniqueResult(
AbstractQueryImpl.java:804)
  at com.tne.nres.projectTracker.ProjectTrackerServlet.validateUser(Unknown
Source)
  at com.tne.nres.projectTracker.ProjectTrackerServlet.doPost(Unknown
Source)
  at javax.servlet.http.HttpServlet.service (HttpServlet.java:709)
  at javax.servlet.http.HttpServlet.service (HttpServlet.java:802)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:252)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:173)
  at org.apache.catalina.core.StandardWrapperValve.invoke(
StandardWrapperValve.java:213)
  at org.apache.catalina.core.StandardContextValve.invoke(
StandardContextValve.java:178)
  at org.apache.catalina.core.StandardHostValve.invoke(
StandardHostValve.java:126)
  at org.apache.catalina.valves.ErrorReportValve.invoke(
ErrorReportValve.java:105)
  at org.apache.catalina.core.StandardEngineValve.invoke(
StandardEngineValve.java:107)
  at org.apache.catalina.connector.CoyoteAdapter.service(
CoyoteAdapter.java:148)
  at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:869)
  at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection
(Http11BaseProtocol.java:664)
  at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(
PoolTcpEndpoint.java:527)
  at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(
LeaderFollowerWorkerThread.java:80)
  at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(
ThreadPool.java:684)
  at java.lang.Thread.run (Thread.java:595)


** END NESTED EXCEPTION **



Last packet sent to the server was 16 ms ago.

STACKTRACE:

com.mysql.jdbc.CommunicationsException: Communications link failure due to
underlying exception:

** BEGIN NESTED EXCEPTION **

java.net.SocketException
MESSAGE: Software caused connection abort: socket write error

STACKTRACE:

java.net.SocketException: Software caused connection abort: socket write
error
  at java.net.SocketOutputStream.socketWrite0(Native Method)
  at java.net.SocketOutputStream.socketWrite (SocketOutputStream.java:92)
  at java.net.SocketOutputStream.write (SocketOutputStream.java:136)
  at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java
:65)
  at java.io.BufferedOutputStream.flush (BufferedOutputStream.java:123)
  at com.mysql.jdbc.MysqlIO.send (MysqlIO.java:2637)
  at com.mysql.jdbc.MysqlIO.sendCommand (MysqlIO.java:1554)
  at com.mysql.jdbc.MysqlIO.sqlQueryDirect (MysqlIO.java:1665)
  at com.mysql.jdbc.Connection.execSQL (Connection.java:3176)
  at com.mysql.jdbc.PreparedStatement.executeInternal(
PreparedStatement.java:1153)
  at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java
:1266)
  at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java
:186)
  at org.hibernate.loader.Loader.getResultSet (Loader.java:1778)
  at org.hibernate.loader.Loader.doQuery (Loader.java:662)
  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(
Loader.java:224)
  at org.hibernate.loader.Loader.doList (Loader.java:2211)
  at org.hibernate.loader.Loader.listIgnoreQueryCache (Loader.java:2095)
  at org.hibernate.loader.Loader.list (Loader.java:2090)
  at org.hibernate.loader.hql.QueryLoader.list (QueryLoader.java:388)
  at org.hibernate.hql.ast.QueryTranslatorImpl.list(
QueryTranslatorImpl.java:338)
  at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java
:172)
  at org.hibernate.impl.SessionImpl.list (SessionImpl.java:1121)
  at org.hibernate.impl.QueryImpl.list (QueryImpl.java:79)
  at org.hibernate.impl.AbstractQueryImpl.uniqueResult(
AbstractQueryImpl.java:804)
  at com.tne.nres.projectTracker.ProjectTrackerServlet.validateUser(Unknown
Source)
  at com.tne.nres.projectTracker.ProjectTrackerServlet.doPost(Unknown
Source)
  at javax.servlet.http.HttpServlet.service (HttpServlet.java:709)
  at javax.servlet.http.HttpServlet.service (HttpServlet.java:802)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:252)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:173)
  at org.apache.catalina.core.StandardWrapperValve.invoke(
StandardWrapperValve.java:213)
  at org.apache.catalina.core.StandardContextValve.invoke(
StandardContextValve.java:178)
  at org.apache.catalina.core.StandardHostValve.invoke(
StandardHostValve.java:126)
  at org.apache.catalina.valves.ErrorReportValve.invoke(
ErrorReportValve.java:105)
  at org.apache.catalina.core.StandardEngineValve.invoke(
StandardEngineValve.java:107)
  at org.apache.catalina.connector.CoyoteAdapter.service(
CoyoteAdapter.java:148)
  at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:869)
  at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection
(Http11BaseProtocol.java:664)
  at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(
PoolTcpEndpoint.java:527)
  at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(
LeaderFollowerWorkerThread.java:80)
  at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(
ThreadPool.java:684)
  at java.lang.Thread.run (Thread.java:595)


** END NESTED EXCEPTION **



Last packet sent to the server was 16 ms ago.
  at com.mysql.jdbc.MysqlIO.send (MysqlIO.java:2652)
  at com.mysql.jdbc.MysqlIO.sendCommand (MysqlIO.java:1554)
  at com.mysql.jdbc.MysqlIO.sqlQueryDirect (MysqlIO.java:1665)
  at com.mysql.jdbc.Connection.execSQL (Connection.java:3176)
  at com.mysql.jdbc.PreparedStatement.executeInternal(
PreparedStatement.java:1153)
  at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java
:1266)
  at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java
:186)
  at org.hibernate.loader.Loader.getResultSet (Loader.java:1778)
  at org.hibernate.loader.Loader.doQuery (Loader.java:662)
  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(
Loader.java:224)
  at org.hibernate.loader.Loader.doList (Loader.java:2211)
  at org.hibernate.loader.Loader.listIgnoreQueryCache (Loader.java:2095)
  at org.hibernate.loader.Loader.list (Loader.java:2090)
  at org.hibernate.loader.hql.QueryLoader.list (QueryLoader.java:388)
  at org.hibernate.hql.ast.QueryTranslatorImpl.list(
QueryTranslatorImpl.java:338)
  at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java
:172)
  at org.hibernate.impl.SessionImpl.list (SessionImpl.java:1121)
  at org.hibernate.impl.QueryImpl.list (QueryImpl.java:79)
  at org.hibernate.impl.AbstractQueryImpl.uniqueResult(
AbstractQueryImpl.java:804)
  at com.tne.nres.projectTracker.ProjectTrackerServlet.validateUser(Unknown
Source)
  at com.tne.nres.projectTracker.ProjectTrackerServlet.doPost(Unknown
Source)
  at javax.servlet.http.HttpServlet.service (HttpServlet.java:709)
  at javax.servlet.http.HttpServlet.service (HttpServlet.java:802)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:252)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:173)
  at org.apache.catalina.core.StandardWrapperValve.invoke(
StandardWrapperValve.java:213)
  at org.apache.catalina.core.StandardContextValve.invoke(
StandardContextValve.java:178)
  at org.apache.catalina.core.StandardHostValve.invoke(
StandardHostValve.java:126)
  at org.apache.catalina.valves.ErrorReportValve.invoke(
ErrorReportValve.java:105)
  at org.apache.catalina.core.StandardEngineValve.invoke(
StandardEngineValve.java:107)
  at org.apache.catalina.connector.CoyoteAdapter.service(
CoyoteAdapter.java:148)
  at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:869)
  at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection
(Http11BaseProtocol.java:664)
  at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(
PoolTcpEndpoint.java:527)
  at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(
LeaderFollowerWorkerThread.java:80)
  at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(
ThreadPool.java:684)
  at java.lang.Thread.run (Thread.java:595)


** END NESTED EXCEPTION **

Thanks,

Christopher Long