Bill Lucy created MYFACES-4107:
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             Summary: StringIndexOutOfBoundsException in getResourceVersion
                 Key: MYFACES-4107
                 URL: https://issues.apache.org/jira/browse/MYFACES-4107
             Project: MyFaces Core
          Issue Type: Bug
    Affects Versions: 2.2.12, 2.1.18, 2.0.24
         Environment: WebSphere Liberty
            Reporter: Bill Lucy
            Assignee: Bill Lucy
            Priority: Minor
         Attachments: MYFACES-4107.patch

I've run into a case where, given an incorrect context parameter, a 
StringIndexOutOfBoundsException is thrown.  This occurs in WebSphere Liberty 
because the server normalizes the external context resource paths during app 
initialization.

For example, this parameter:

<context-param>
   <param-name>javax.faces.WEBAPP_RESOURCES_DIRECTORY</param-name>
   <param-value>/META-INF/resources</param-value>
</context-param>

throws:

java.lang.StringIndexOutOfBoundsException: String index out of  range: 35
at java.lang.String.substring(String.java:1377)
at 
org.apache.myfaces.shared.resource.ExternalContextResourceLoader.getResourceVersion(ExternalContextResourceLoader.java:81)

That parameter value is not allowed to have a leading slash.  However, the 
current exception is not very helpful, and can be easily avoided.  

I'll attach a patch which avoids the StringIndexOutOfBoundsException in 
getResourceVersion(); we already have this logic in getLibraryVersion().






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