java - taglib error in struts1.1 -


i have written securityfilter struts1.1 based web application. when try load start.jsp index.jsp, getting nullpointer exception struts taglib used in start.jsp.

stack trace

at org.apache.jasper.servlet.jspservletwrapper.handlejspexception(jspservletwrapper.java:579)         @ org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapperjava:476)         @ org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:396)         @ org.apache.jasper.servlet.jspservlet.service(jspservlet.java:340)         @ javax.servlet.http.httpservlet.service(httpservlet.java:729)         @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:290)         @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:206) caused by: java.lang.nullpointerexception         @ org.apache.struts.taglib.tagutils.pageurl(tagutils.java:1070)         @ org.apache.struts.taglib.tagutils.computeurlwithcharencoding(tagutils.java:449)         @ org.apache.struts.taglib.html.rewritetag.dostarttag(rewritetag.java:55)         @ org.apache.jsp.start_jsp._jspx_meth_html_005frewrite_005f0(start_jsp.java:210)         @ org.apache.jsp.start_jsp._jspservice(start_jsp.java:65)         @ org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:94)         @ javax.servlet.http.httpservlet.service(httpservlet.java:802)         @ org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:324)         @ org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:292)         @ org.apache.jasper.servlet.jspservlet.service(jspservlet.java:236)         @ javax.servlet.http.httpservlet.service(httpservlet.java:802)

index.jsp

<%@ taglib prefix="html" uri="/web-inf/struts-html.tld" %>     <html>     <body>         <p>           user: <%=request.getattribute("username")%>!         </p>         <a href="/start.jsp">go bank db app</a>     </body>     </html>

q1: why getting nullpointerexception when click link present on index.jsp?

q2: how load index.jsp through struts container (as start.jsp gets loaded if securityfilter removed web.xml , app works fine)?


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