DO NOT REPLY [Bug 28058] New: - JspRuntimeLibrary.getContextRelativePath() can throw StringIndexOutOfBoundsException

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http://issues.apache.org/bugzilla/show_bug.cgi?id=28058

JspRuntimeLibrary.getContextRelativePath() can throw StringIndexOutOfBoundsException

           Summary: JspRuntimeLibrary.getContextRelativePath() can throw
                    StringIndexOutOfBoundsException
           Product: Tomcat 5
           Version: 5.0.19
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Jasper
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: pruchaba_bah@scrb.navy.mil


A program I am working on is throwing an exception 
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
from within
org.apache.jasper.runtime.JspRuntimeLibrary.getContextRelativePath
(JspRuntimeLibrary.java:963)

According to the docs http://jakarta.apache.org/tomcat/tomcat-5.0-
doc/servletapi/javax/servlet/http/HttpServletRequest.html#getServletPath(), 
getServletPath() can return an empty string which is what is happening in my 
app.  The line in question:

    uri.substring(0, uri.lastIndexOf('/')) + '/' + relativePath

where uri is an empty string is what is causing this exception to be thrown.  
As you can see uri.lastIndexOf is going to return -1 and uri.substring(0, -1) 
just does not work.

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