Validation error. "commandButton" must have value or image attributes.

Issue

• Using JSF a JSP throws the following exception:

  ERROR [io.undertow.request] (default task-96) UT005023: Exception handling request to /xxxxx.jsp: org.apache.jasper.JasperException: <h3>JBWEB004208: Validation error messages from TagLibraryValidator for h in /xxxxx.jsp</h3><p>null: Validation error. "commandButton" must have value or image attributes.
  </p>
           at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:57)
           at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:278)
           at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:75)
           at org.apache.jasper.compiler.Validator.validateXmlView(Validator.java:1878)
           at org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1825)
           at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:218)
           at org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)
           at org.apache.jasper.compiler.Compiler.compile(Compiler.java:334)
           at org.apache.jasper.compiler.Compiler.compile(Compiler.java:321)
           at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:652)
           at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)
           at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:403)
           at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:347)