Hello,
we host a Tomcat 6 server with several webapps on it. It is used for
continuous integration, so the test webapps are deployed often. We run
into OutOfMemoryError: PermGen space after some redeployments and
cannot find a solution.
I connected JConsole remotely and made a screenshot after some
redeployments. The screenshot is attached to this mail. After the
first redeployment of webapp 1 the PermGen raises to 150MB and after
the deployment it is freed to 115 MB, which seems to be ok. However,
the second redeployment won't release the PermGen as you can see on
the screenshot. After that, every redeployment will take another 40MB
of PermGen space wich leads to the OutOfMemory error, because we set
the MaxPermSize to 256m.
I tried a manual GC, but this worked only once (see screenshot). After
this, the GC was useless.
The start parameters of the tomcat server are:
-server -Xmx1g -XX:MaxPermSize=256m -XX:+CMSClassUnloadingEnabled -
Djava.awt.headless=true -
javaagent:org.springframework.instrument-3.0.0.M2.jar
The stacktrace is:
SEVERE: org/springframework/web/context/request/
AbstractRequestAttributes
java.lang.OutOfMemoryError: PermGen space
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.getDeclaredMethod(Class.java:1935)
at java.io.ObjectStreamClass.getPrivateMethod(ObjectStreamClass.java:
1382)
at java.io.ObjectStreamClass.access$1700(ObjectStreamClass.java:52)
at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:438)
at java.security.AccessController.doPrivileged(Native Method)
at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:413)
at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:310)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:
1106)
at
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:
1509)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:
1474)
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:
1392)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:
1150)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
at java.util.ArrayList.writeObject(ArrayList.java:570)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun
.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
39)
at
sun
.reflect
.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:
945)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:
1461)
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:
1392)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:
1150)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
at sun.rmi.server.UnicastRef.marshalValue(UnicastRef.java:274)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:315)
at sun.rmi.transport.Transport$1.run(Transport.java:159)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
at
sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
at sun.rmi.transport.tcp.TCPTransport
$ConnectionHandler.run0(TCPTransport.java:790)
And the screenshot:
Any help would be great for us. Thank you very much.
Timo Meinen
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