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From Félix Pedrera García <felix.pedr...@deimos-space.com>
Subject PernGen memory leak with Tomcat 5.5.9
Date Thu, 20 Oct 2005 13:19:27 GMT
Hi!
 
We are working on a web application using Struts 1.2.7, deployed on 
Tomcat 5.5.9 on Solaris SunOS 5.8 and JVM 1.5.0_04-b05 and we have the 
following problem:
 
Sometimes we get an  java.lang.OutOfMemoryError: PermGen space and the 
logs do not say anything more about the problem.
 
We are monitoring the PerGen space with JMap command and we noticed that 
the PerGen space is always growing up untill it gets the maximum 
configured PermGen size: -XX:MaxPermSize=256m and then we get the 
OutOfMemoryError.
With JMap -histo we monitor the alive instances in our JVM and we see 
that, aside of multiple java.lang.String and other similar objects, 
there are also a lot of DTO objects that we use in the application to 
transfer data from Action classes to the view (jsp), and we understand 
that these objects should only be alive while the request is active, 
but, as we can see looking at the number of these objects, they are 
still alive.
 
160576 5018 zyx.mvc.model.DeviceData
116480 3640 zyx.mvc.model.DeviceData
73584 1533 zyx.mvc.model.TestResultByUser
60120 1503 zyx.mvc.model.TestResultData
27440 490 zyx.mvc.model.DeviceDataByUserPattern
15240 381 zyx.mvc.model.Device
14400 300 zyx.mvc.model.TestCaseWithLastResult
13032 543 zyx.mvc.model.Technology
12576 262 zyx.mvc.model.TestCase
12520 313 zyx.mvc.model.TestGroup
10656 444 zyx.mvc.model.Service
4848 101 zyx.mvc.model.TestCase
4320 108 zyx.mvc.model.Device
3808 68 zyx.mvc.model.DeviceDataByUserPattern
1120 28 zyx.mvc.model.TestGroup
920 23 zyx.mvc.model.User
840 15 zyx.mvc.model.TechnologiesReportData
600 15 zyx.mvc.model.Firmware
504 7 zyx.mvc.forms.TestResultsForm
320 8 zyx.utils.TestCasesNavigator
240 10 zyx.common.ActivityLogDBAccess
192 3 zyx.mvc.forms.ResultsByServiceForm
160 5 zyx.mvc.model.PreviousTestResultData
160 5 zyx.utils.Text2HTMLTag
136 17 zyx.database.DBManager
128 2 zyx.mvc.forms.ResultsByTechForm
112 14 zyx.database.DBDevice
1 zyx.mvc.forms.ResultsByServiceForm
64 1 zyx.mvc.forms.ResultsByTechForm
56 1 zyx.mvc.ControlServlet
56 1 zyx.database.pool.DBConnectionPool
56 1 zyx.sms.SMSServlet
56 1 zyx.mvc.ControlServlet
 
Why these resources are not destroyed?
 
We have been looking at the

http://issues.apache.org/bugzilla/show_bug.cgi?id=14042

and since this bug is fixed from struts version 1.2.7, we think this can 
not be the problem.

Any idea?

Thanks in advance,

-- 
Félix Pedrera García


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