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My application hangs in Tomcat

 
tin Gupta
Greenhorn
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Hi All,

I have an application which is running in Tomcat 5.5. It is developed with the heavy use of Spring/Hibernate. It runs well for 1-2 hrs but then just hangs. Tomcat does not show any error (out of memory or some other) in the logs but does not respond to any request. I can only see the app's login page once it hangs.

In my application, a set of 10 jobs (Quartz API) get fired after every 5 minutes. I checked the logs and these jobs tohether take just 3 seconds to finish when the server is running normally. I have checked my code many a times but I doubt its my code's problem.

I have also tried increasing the heap size but it did not help either.

I am really confused as to what can be the issue. Is it some problem with Spring/Hibernate configuration, Memory leaks?

Please suggest me how can i really diagnose the problem and fix it.

Cheers,
Nitin
 
Ben Souther
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One of the common causes of problems like this is running out of database connections. In your code are you always sure to close database connections after you use them?
 
William Brogden
Author and all-around good cowpoke
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You might try monitoring with Tomcat's Management application. You can see memory use and request Thread use. I was highly surprised one time to see that my Tomcat had maxed out request Threads due to an improperly removed application - result, it could not respond to new requests.

Bill
 
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