[jboss-user] [JBoss Portal] - Null Pointer Exception with JSTL format tag

[jupallis]

Portal: JBoss 2.6.6 GA with JBoss AS 4.2.3. 

NPE while trying to use the JSTL fmt:message tag. 


  | Please find the stack trace below:
  | 18:58:46,984 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception java.lang.NullPointerException
  |         at org.apache.taglibs.standard.tag.common.fmt.BundleSupport.findMatch(BundleSupport.java:250)
  |         at org.apache.taglibs.standard.tag.common.fmt.BundleSupport.getLocalizationContext(BundleSupport.java:186)
  |         at org.apache.taglibs.standard.tag.common.fmt.BundleSupport.doStartTag(BundleSupport.java:95)
  |         at org.apache.jsp.layouts.autodesk._2column_jsp._jspx_meth_fmt_005fbundle_005f0(_2column_jsp.java:563)
  |         at org.apache.jsp.layouts.autodesk._2column_jsp._jspService(_2column_jsp.java:180)
  |         at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
  |         at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
  |         at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
  |         at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:336)
  |         at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
  |         at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  | 

When we look at the code for the BundleSupport.findMatch()


  | 243     private static LocalizationContext findMatch(PageContext  pageContext,
  | 244                          String  basename) {
  | 245     LocalizationContext locCtxt = null;
  | 246     
  | 247     // Determine locale from client's browser settings.
  | 248 
  | 249     for (Enumeration  enum_ = Util.getRequestLocales((HttpServletRequest )pageContext.getRequest());
  | 250          enum_.hasMoreElements(); ) {   //   <-- Line no 250.
  | 251         Locale  pref = (Locale ) enum_.nextElement();
  | 252         ResourceBundle  match = findMatch(basename, pref);
  | 

Enumeration enum_ is being returned as null as part of the method call Util.getRequestLocales(). 

if we look at the code for Util.getRequestLocales()

  | 280         Enumeration  values = request.getHeaders("accept-language");
  | 281         if (values.hasMoreElements()) {
  | 282             // At least one "accept-language". Simply return
  | 283 		// the enumeration returned by request.getLocales().
  | 284 		// System.out.println("At least one accept-language");
  | 285 		return request.getLocales();
  | 286         } else {
  | 287             // No header for "accept-language". Simply return
  | 288 		// the empty enumeration.
  | 289 		// System.out.println("No accept-language");
  | 290 		return values;
  | 
In the above code though the NPE problem at Ln.no 280 has been fixed still the reqeust.getLocales() is returning null and the JSTL tag is ending up with the NPE.


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