JarResourceLoader does not accept paths inside JAR files
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                 Key: VELOCITY-590
                 URL: https://issues.apache.org/jira/browse/VELOCITY-590
             Project: Velocity
          Issue Type: Bug
          Components: Engine
    Affects Versions: 1.5
            Reporter: Ales Dolecek
            Priority: Minor


According to documentation of JarResourceLoader it accepts paths that conform 
to rules given by java.net.JarUrlConnection. This is however not true as the 
JarUrlConnection says that the URL has form

jar:<url>!/{entry}

The "!/" is mandatory part of the URL. JarResourceLoader however expects the 
path whitout this suffix and automatically appends it. When conforming URL is 
given JarResourceLoader makes it invalid

eg.

/directory/file.jar!/META-INF/templates/

is scrambled to

/directory/file.jar!/META-INF/templates/!/

which is invalid and no templates are found.

I try to package templates along with tools and other code. I put them into 
/META-INF/templates/ and try to setup the loader so I do not have to prefix 
template names with "/META-INF/templates/".

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Ideally the JarResourceLoader should not append "!/" suffix at all. For 
compatibility reasons it should do so only if the path does not contain it 
already.

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