[jira] [Work logged] (BCEL-320) A new ClassPathRepository that can scan many JAR files without OutOfMemoryError

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BCEL-320?focusedWorklogId=272769&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-272769 ]

ASF GitHub Bot logged work on BCEL-320:
---------------------------------------

                Author: ASF GitHub Bot
            Created on: 05/Jul/19 22:53
            Start Date: 05/Jul/19 22:53
    Worklog Time Spent: 10m 
      Work Description: garydgregory commented on pull request #28: [BCEL-320] LruCacheClassPathRepository
URL: https://github.com/apache/commons-bcel/pull/28
 
 
   
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 272769)
    Time Spent: 20m  (was: 10m)

> A new ClassPathRepository that can scan many JAR files without OutOfMemoryError
> -------------------------------------------------------------------------------
>
>                 Key: BCEL-320
>                 URL: https://issues.apache.org/jira/browse/BCEL-320
>             Project: Commons BCEL
>          Issue Type: Improvement
>            Reporter: Tomo Suzuki
>            Priority: Minor
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> (This ticket is derivation from [BCEL-317|https://issues.apache.org/jira/browse/BCEL-317], which I found creating ConstantUtf8 cache is not straightforward under current ClassPathRepository design.)
> We use BCEL library in https://github.com/GoogleCloudPlatform/cloud-opensource-java . Thank you for great library.
> h1. Background
> Our use of BCEL ClassPathRepository and MemorySensitiveClassPathRepository causes OutOfMemoryError when they scan many (~200) JAR files. Initially I thought this problem could be fixed by [BCEL-317|https://issues.apache.org/jira/browse/BCEL-317], but it turned out that it's not straightforward under current design. Instead of focusing on ConstantUtf8, I decided to use my own custom ClassPathRepository that uses LRU cache internally to hold JavaClass instances. It worked.
> This ticket is to contribute the idea to BCEL library so that other users can benefit from it.
> h1. Test Case
> This GitHub project is a example of OutOfMemoryError caused by scanning many JAR files using BCEL ClassPathRepository and MemorySensitiveClassPathRepository:
> https://github.com/suztomo/bcel-oome-example



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