[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:all-tabpanel ]

Bruce Garner updated JASSIST-150:
---------------------------------

    Attachment: Jassist150.java


This is a worst case. It will however illustrate the problem.

Running this takes 32s per test on my machine.
Running it will a small set of changes to the code and it takes only 0.32s.
                
> 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
>
>
> 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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