Web Service deployed on Tomcat stops responding after sometime

[whitesox99]

Hi,

I haven't used Tomcat before and is the first time I am using it. I have Web Service that is deployed on Tomcat 5 installed on my local system. Web Service I am using Spring, Hibernate. The issue I am facing is
after deploying a service all works fine. As soon as I leave the service idle means I don't make any calls to the Web Service for couple of hours
my Web Service stops working. If I try to invoke a Web Service I get an error message and looking at the logs I don't see any call to the Web Service so I end up undeploying and redeploying the Web Service and it starts working and if I don't invoke the Service for couple of hours it stops working and I then I have to undeploy and redeploy the Service.

Any idea waht might be the problem where to look. Why the Service keeps working as long as I keep calling but stops working if I call after couple of hours. Is there any settings I need to make on Tomcat as I am new to Tomcat so have no idea where to look.

Any help is appreciated.

Thanks