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

[Shigeru Chiba (JIRA)]

    [ https://issues.jboss.org/browse/JASSIST-150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12665864#comment-12665864 ] 

Shigeru Chiba commented on JASSIST-150:
---------------------------------------

Because Bruce's patch changes the behavior of ClassPool and the change affects all the behavior of the whole Javassist, I have modified only the compiler with the same idea.

Bruce, can you kindly check this fix with your own junit tests?  I will release a new version within several days.

Thanks.
                
> 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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