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From Sylvia Llano de la Peña <sylvia.ll...@deimos-space.com>
Subject PerGen memory leak with Struts 1.2.7
Date Thu, 20 Oct 2005 11:38:54 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,

Sylvia



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