[MySQL et Servlet] Communication link failure

Salut, je rencontre un souci avec une de mes appli web (servlet en interaction avec une db MySQL).
Elle fonctionne parfaitement bien, mais au bout de quelques heures mon serveur tomcat me renvoi un Rapport d'exception :

Code:

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servletGST.domaine.RuntimeGSTException: java.sql.SQLException: Communication link failure: java.net.SocketException, underlying cause: Software caused connection abort: recv failed
 
** BEGIN NESTED EXCEPTION ** 
 
java.net.SocketException
MESSAGE: Software caused connection abort: recv failed
 
STACKTRACE:
 
java.net.SocketException: Software caused connection abort: recv failed
	at java.net.SocketInputStream.socketRead0(Native Method)
	at java.net.SocketInputStream.read(Unknown Source)
	at java.io.BufferedInputStream.fill(Unknown Source)
	at java.io.BufferedInputStream.read(Unknown Source)
	at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:1399)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1775)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1020)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1109)
	at com.mysql.jdbc.MysqlIO.sqlQuery(MysqlIO.java:1070)
	at com.mysql.jdbc.Connection.execSQL(Connection.java:2027)
	at com.mysql.jdbc.Connection.execSQL(Connection.java:1984)
	at com.mysql.jdbc.Statement.executeQuery(Statement.java:1152)
	at servletGST.mapping.PersistanceManagerDB.findUtilisateurByLogin(PersistanceManagerDB.java:1129)
	at servletGST.web.ServletGST.doPost(ServletGST.java:70)
	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:856)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	at java.lang.Thread.run(Unknown Source)
 
 
** END NESTED EXCEPTION **
 
 
	servletGST.mapping.PersistanceManagerDB.findUtilisateurByLogin(PersistanceManagerDB.java:1137)
	servletGST.web.ServletGST.doPost(ServletGST.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

J'utilise :
Apache Tomcat/5.5.9
mysql-5.0.17 --> innodb
mysql-administrator-1.1.6 --> pour importer mes script sql
importation en utf8, charset --> utf8

J'ai essayé de voir si MySQL coupait la connection au bout d'un certain temps mais je ne trouve rien de tout ca.