This stack trace seems short and unusually terse. I can guess this is
Sun JDK 1.4 since javax.transaction.SystemException doesn't exist in
later JDKs. Since the exception is thrown by
com.met.data.factory.user.UserFactory, is this class one of yours? If
so, it would be great if you could add logging where this exception is
thrown to shed some light on the root cause. You could even add it as a
String in the exception's constructor.
--David
fdehghani wrote:
also i have to say that i use hibernate 3 to connect to Mysql
thanks for your attention
-- Fatemeh
fdehghani wrote:
Tomcat 5.5.9
OS Windows Server 2003 , Windows XP
Mysql 5.0
tomcat and mysql on the same server
javax.transaction.SystemException
com.met.data.factory.user.UserFactory.getUser(UserFactory.java:694)
com.met.action.LoginAction.execute(LoginAction.java:56)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
com.met.filter.CharsetFilter.doFilter(CharsetFilter.java:31)
any connection closed after open it
-- Fatemeh
David Smith-2 wrote:
Can you provide some specifics of your environment?
Tomcat version
OS
Mysql version (both driver and server)
Both tomcat and mysql on the same machine?
If not, any firewalls that might be timing out a connection?
How long does it run before it doesn't work?
Can you post the full stack trace of your exception including root cause?
In your design, are you holding on to connections or closing them as
soon as you are done talking to the db?
Mysql server does timeout connections after 8 hours by default. If you
are using tomcat's database pooling, this can be fixed with the simple
addition of a validation query in the config. In any case, it's best
practice for the code querying the db to close connections as soon as
reasonably possible and not keep them open.
--David
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