[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=12664561#comment-12664561 ] 

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

Yes - for my powermock tests it does.
For tests which mock large junits, or lots of classes and big heirarchies it improves the performance a lot.
The one junit with 25 tests reduced from 60s down to 10s.
                
> 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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