Adding a context-param to the beginning a Grails app web.xml

eventWebXmlEnd.groovy

eventWebXmlEnd = { String tmpfile ->
    def contextParam = '''<context-param>
        <description>Spring Expression Language Support</description>
        <param-name>springJspExpressionSupport</param-name>
        <param-value>false</param-value>
    </context-param>'''
    def root = new XmlParser().parse(webXmlFile)
    root.children().add(0, new XmlParser().parseText(contextParam))
    new XmlNodePrinter(new PrintWriter(new FileWriter(webXmlFile))).print(root)
}