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https://issues.apache.org/jira/browse/BEANUTILS-291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12586434#action_12586434
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Clebert Rezende Suconic commented on BEANUTILS-291:
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This issue on reflection is "a little" bit more complicated than what appears.
You need to save the method or field information for an occasional recreation
if necessary.
If you want to, I used this solution on JBossSerialization:
http://anonsvn.jboss.org/repos/jbossserialization/trunk/src/org/jboss/serial/references/
I called it PersistentReference. When you get a Reflection reference, I keep
the names, the Class (on a WeakRefeference of course) and argument types in a
way you recreate the reference when necessary.
I used this just for simple Arguments, so maybe we would need to expand
ArgumentReference to also save the name types for the arguments.
> Circular Reference on WeakHashMap
> ---------------------------------
>
> Key: BEANUTILS-291
> URL: https://issues.apache.org/jira/browse/BEANUTILS-291
> Project: Commons BeanUtils
> Issue Type: Bug
> Components: Bean / Property Utils
> Affects Versions: 1.8.0-BETA
> Reporter: Niall Pemberton
> Fix For: 1.8.0
>
> Attachments: BEANUTILS-291-FixMemoryLeaks-v2.patch,
> memoryLeakTests-new.zip, PropertyUtilsBean.java
>
>
> Clebert Suconic wrote on the [EMAIL PROTECTED] list ....
> (see http://tinyurl.com/2a9gan)
> I have been investigating WeakHashMaps on BeanUtils 1.8 as part of a
> investigation on this:
> http://jira.jboss.com/jira/browse/JBAS-2299
> (Which is not actually an issue with JBAS, but an issue when using BeanUtils
> as part of the classPath).
> There is a circular reference on the WeakHashMap, The WeakHashMap will have
> the ClassLoader as the key, and it will have a reference back to the Key from
> one of the Reflection objects. This doesn't work! (Please.. no discussions
> about this point.. if you don't believe me, do some testing with simple stuff
> before discussing this and come back to me only after that)
> [EMAIL PROTECTED]
> !--- [EMAIL PROTECTED]
> !--- !--- class sun.reflect.GeneratedConstructorAccessor38
> !--- !--- !--- [Ljava.lang.Object;@10800875
> !--- !--- !--- !--- [EMAIL PROTECTED]
> !--- !--- !--- !--- !--- [EMAIL PROTECTED]
> !--- !--- !--- !--- !--- !--- class sun.reflect.GeneratedConstructorAccessor38
> !--- !--- !--- !--- !--- !--- !--- class java.lang.Class
> !--- !--- !--- !--- !--- !--- !--- !--- [EMAIL PROTECTED]
> !--- !--- !--- !--- !--- !--- !--- !--- !--- [EMAIL PROTECTED]
> !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- [EMAIL PROTECTED]
> !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- [EMAIL PROTECTED]
> !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !---
> [Ljava.util.HashMap$Entry;@28236766
> !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- [EMAIL
> PROTECTED]
> !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- [EMAIL
> PROTECTED]
> !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !--- !---
> [EMAIL PROTECTED]
> !--- !--- !--- !--- !--- !--- !--- !--- !-- -!--- !--- !--- !--- !--- !---
> !---FieldReference private java.lang.Object [EMAIL PROTECTED] Detail
> I don't know if I'm preaching to the choir, but just in case this is new
> information to someone... you should aways keep Reflection referenced as
> SoftReferences (if you really have to). Reflection is aways a new object so a
> WeakReference is too weak.
> On JBossSerialization I have solved this using an interesting way. I called
> it PersistentReference. I'm using SoftReferences, and keeping the information
> to recreate it case the SoftReference is cleared:
> http://fisheye.jboss.org/browse/JBoss/jboss-serialization/src/org/jboss/serial/references/PersistentReference.java?r=1.3
> And also... you guys should write a testcase to validate if the Caching is
> being cleared. (I don't know if you have one).
> http://anonsvn.jboss.org/repos/jbossserialization/trunk/tests/org/jboss/serial/memory/MemoryLeakTestCase.java
> You don't need to use the jboss-profiler API for this.. just create a
> WeakReference to a new ClassLoader, and validate if it was released at the
> end after some exercizing some code on this caching. You will
> probably need to fill your memory almost to 100% on the test as SoftReference
> are only gone when the memory is low.
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