File.read or File.open with a url to a file resource fails with 
StringIndexOutOfBounds exception
------------------------------------------------------------------------------------------------

                 Key: JRUBY-3634
                 URL: http://jira.codehaus.org/browse/JRUBY-3634
             Project: JRuby
          Issue Type: Bug
            Reporter: Chad DePue
            Assignee: Thomas E Enebo


doesn't matter if the file resource is valid, placing a url in the method 
causes this error:

jruby -e 'File.read("file://")'
String.java:1768:in `substring': java.lang.StringIndexOutOfBoundsException: 
String index out of range: -6
        from ChannelDescriptor.java:616:in `open'
        from ChannelDescriptor.java:586:in `open'
        from ChannelStream.java:1127:in `fopen'
        from RubyFile.java:513:in `fopen'
        from RubyFile.java:483:in `openInternal'
        from RubyFile.java:457:in `openFile'
        from RubyFile.java:421:in `initialize'
        from 
org/jruby/RubyFile$i_method_0_2$RUBYFRAMEDINVOKER$initialize.gen:-1:in `call'
        from CachingCallSite.java:238:in `cacheAndCall'
        from CachingCallSite.java:46:in `callBlock'
        from CachingCallSite.java:51:in `call'
        from RubyClass.java:592:in `newInstance'
        from RubyIO.java:976:in `open'
        from RubyKernel.java:266:in `open'
        from RubyIO.java:2987:in `read'
        from org/jruby/RubyIO$s_method_multi$RUBYINVOKER$read.gen:-1:in `call'
        from JavaMethod.java:312:in `call'
        from CachingCallSite.java:278:in `cacheAndCall'
        from CachingCallSite.java:117:in `call'
        from -e:1:in `__file__'
        from -e:-1:in `load'
        from Ruby.java:560:in `runScript'
        from Ruby.java:482:in `runNormally'
        from Ruby.java:360:in `runFromMain'
        from Main.java:229:in `run'
        from Main.java:110:in `run'
        from Main.java:94:in `main'


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