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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