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Thrown when an application is trying to use or access an object whose reference equals to null but if you are getting no message, try using the option
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Configuration failed on WebSphere 6.1 on AIX with NullPointerException. The exception is caused by it couldn't read file "WEB-INF/classes/is-html.xsl". The problem is the file is missing leading "/". The filename should be "/WEB-INF/classes/is-html.xsl". This is confirmed with javadoc: "The path must begin with a "/" and is interpreted as relative to the current context root."