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Jinu in Error, JAVA, JAVA SERVER FACES
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JSF Error Failed to parse the expression [#{navController.go_to_index()}]

JSF Page load Error

javax.faces.view.facelets.TagAttributeException: /tab.xhtml @12,84 action="#{navController.go_to_index()}" Failed to parse the expression [#{navController.go_to_index()}]
  1. An error comes on running code as shown below. 
    <html xmlns="http://www.w3.org/1999/xhtml"
 xmlns:h="http://xmlns.jcp.org/jsf/html">
 <h:head>
 <title>Facelet Title</title>
 </h:head>
 <h:body>
 <h:form>
 <h:commandButton value="Index" action="#{navController.go_to_index()}"></h:commandButton>
 <h:commandButton value="About Us" action="#{navController.go_to_about()}"></h:commandButton>
 <h:commandButton value="Contact Us" action="#{navController.go_to_contact()}"></h:commandButton>
 </h:form>
 </h:body>
</html>
  2. Solution.
    Remove the Braces () of the call function.

     <h:form>
 <h:commandButton value="Index" action="#{navController.go_to_index}"></h:commandButton>
 <h:commandButton value="About Us" action="#{navController.go_to_about}"></h:commandButton>
 <h:commandButton value="Contact Us" action="#{navController.go_to_contact}"></h:commandButton>
 </h:form>

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