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https://issues.apache.org/jira/browse/GERONIMO-5683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932397#action_12932397
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Ashish Jain commented on GERONIMO-5683:
---------------------------------------

Thank you Jarek/Kevan.  I will revert back the changes and will instead make 
the init method synchronized.

> Thread safety for needScanJar(), scanJar(), and scannedJars.add()  in 
> GeronimoTldLocationsCache
> -----------------------------------------------------------------------------------------------
>
>                 Key: GERONIMO-5683
>                 URL: https://issues.apache.org/jira/browse/GERONIMO-5683
>             Project: Geronimo
>          Issue Type: Bug
>      Security Level: public(Regular issues) 
>    Affects Versions: 2.1.6, 2.2.1, 3.0-M1
>         Environment: geronimo tomcat assembly 2.1.7
>            Reporter: Ashish Jain
>            Assignee: Ashish Jain
>             Fix For: 2.1.7, 2.2.2, 3.0
>
>
> The following error is encountered under heavy load when there are multiple 
> threads accessing "GeronimoTldLocationsCache.scanJars".
> java.lang.ArrayIndexOutOfBoundsException                                
>  at java.util.ArrayList.ensureCapacity(ArrayList.java:196)              
>  at java.util.ArrayList.add(ArrayList.java:377)                         
>  at org.apache.geronimo.jasper.GeronimoTldLocationsCache.scanJars       
> (GeronimoTldLocationsCache.java:479)                                    
>  at org.apache.geronimo.jasper.GeronimoTldLocationsCache.scanJars       
> (GeronimoTldLocationsCache.java:457)                                    
>  at org.apache.geronimo.jasper.GeronimoTldLocationsCache.scanJars       
> (GeronimoTldLocationsCache.java:457)                                    
>  at org.apache.geronimo.jasper.GeronimoTldLocationsCache.init           
> (GeronimoTldLocationsCache.java:218)                                    
>  at org.apache.geronimo.jasper.GeronimoTldLocationsCache.getLocation    
> (GeronimoTldLocationsCache.java:209)                                    
>  at org.apache.jasper.JspCompilationContext.getTldLocation              
> (JspCompilationContext.java:550)                                        
>  at org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java: 
> 430)                                                                    

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