[jboss-jira] [JBoss JIRA] (JASSIST-150) Performance problem with loading classes under certain circumstances

[Bruce Garner (JIRA)]

    [ https://issues.jboss.org/browse/JASSIST-150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12664511#comment-12664511 ] 

Bruce Garner commented on JASSIST-150:
--------------------------------------

Yes - under one circumstance caching isn't working.
If you have a look at the attachement I uploaded earlier today you can see some minor changes to the caching which I believe makes the caching simpler. It places the logic of what to cache closer to the cache.
I have run the junits with these changes and they all work and I'm doing the same on our entire project currectly to see that all the junits work.

                
> Performance problem with loading classes under certain circumstances
> --------------------------------------------------------------------
>
>                 Key: JASSIST-150
>                 URL: https://issues.jboss.org/browse/JASSIST-150
>             Project: Javassist
>          Issue Type: Enhancement
>    Affects Versions: 3.15.0-GA
>            Reporter: Bruce Garner
>            Assignee: Shigeru Chiba
>         Attachments: Jassist150.java, Javassist150src.zip
>
>
> There is a performance problem in the class loading in javassist.  Under certain circumastance the parse of the code will mean that javassist will attempt to load classes starting at the base of the package, and get failures for the package base until it finds the class. There is no caching of this failure so each attempt to load the class searches the entire classpath and fails.
> Unfortunately the code in PowerMock exercises this bug, and in large systems with may items on the classpath, large numbers of classes and large classes the process can be slow.

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