BUndle Undeployment- Not GC'e - holds reference to - CachedIntrospectionResults

[sudheerk84]

I have a application bundle which i deploy- undeploy 100 times with 10 seconds interval.

Then i take a heap dump and read it using Eclipse MAT.

I see that none of the classloaders are garbage collected and there are 100 instances of it.

When i see GC root to the instances it shows that org.springframework.beans.CachedIntrospectionResul ts holds reference to all the classloaders.

I have attached the GC root obtained in MAT.

As a solution to this i added the following in my shutdown method

	CachedIntrospectionResults.clearClassLoader(getClass().getClassLoader());
to unregister the bundle classsloader.

When i explicity remove the classloader from there , garbage collection happens fine and classloaders are garbage collcted.

But i am not sure why does
org.springframework.beans.CachedIntrospectionResul ts have reference to my bundle after undeployment ?

[sudheerk84]

I have figured out that this issue is with spring Core where it caches the class instance and does not clear it on undeployment.

I have a simple bundle with this xml

<bean id="bean1" class="com.test.Bean1">
   <property name="bean2" ref="bean2"></property> 
</bean>

<bean id="bean2" class="com.test.Bean2"></bean>

When i deploy undeploy this bundle 100 times i see in teh trace that class refernce is help by CachedIntrospectionResults.

All 150 instances of classloader is not garbage collected because of this.


Attached is the snapshot from MAT