java - page is not redirect -

-

org.apache.jasper.jasperexception: exception in jsp: /views/header.jsp:14

11:         <a href="<%=request.getcontextpath()%>">home</a> |  12:         <% string username=(string)session.getattribute("formdata"); 13:         string admin="admin"; 14:         if(username.equals(" ")){ 15:              16:             string logout="http://localhost:8080/newsbank/logout.do"; 17:             response.sendredirect(logout);

stacktrace:

    org.apache.jasper.servlet.jspservletwrapper.handlejspexception(jspservletwrapper.java:451)     org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:373)     org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:321)     org.apache.jasper.servlet.jspservlet.service(jspservlet.java:257)     javax.servlet.http.httpservlet.service(httpservlet.java:729)     org.springframework.web.servlet.view.internalresourceview.rendermergedoutputmodel(internalresourceview.java:238)     org.springframework.web.servlet.view.abstractview.render(abstractview.java:250)     org.springframework.web.servlet.dispatcherservlet.render(dispatcherservlet.java:1063)     org.springframework.web.servlet.dispatcherservlet.dodispatch(dispatcherservlet.java:801)     org.springframework.web.servlet.dispatcherservlet.doservice(dispatcherservlet.java:719)     org.springframework.web.servlet.frameworkservlet.processrequest(frameworkservlet.java:644)     org.springframework.web.servlet.frameworkservlet.doget(frameworkservlet.java:549)     javax.servlet.http.httpservlet.service(httpservlet.java:627)     javax.servlet.http.httpservlet.service(httpservlet.java:729)  root cause  java.lang.nullpointerexception     org.apache.jsp.views.addstory_jsp._jspservice(addstory_jsp.java:93)     org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:98)     javax.servlet.http.httpservlet.service(httpservlet.java:729)     org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:331)     org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:321)     org.apache.jasper.servlet.jspservlet.service(jspservlet.java:257)     javax.servlet.http.httpservlet.service(httpservlet.java:729)     org.springframework.web.servlet.view.internalresourceview.rendermergedoutputmodel(internalresourceview.java:238)     org.springframework.web.servlet.view.abstractview.render(abstractview.java:250)     org.springframework.web.servlet.dispatcherservlet.render(dispatcherservlet.java:1063)     org.springframework.web.servlet.dispatcherservlet.dodispatch(dispatcherservlet.java:801)     org.springframework.web.servlet.dispatcherservlet.doservice(dispatcherservlet.java:719)     org.springframework.web.servlet.frameworkservlet.processrequest(frameworkservlet.java:644)     org.springframework.web.servlet.frameworkservlet.doget(frameworkservlet.java:549)     javax.servlet.http.httpservlet.service(httpservlet.java:627)     javax.servlet.http.httpservlet.service(httpservlet.java:729)

username seems null me.

check nullity

if(username != null || "".equals(username)){ //your code }

suggestions:

  • we have filter (authentication check) purpose why spoiling jsp ?

  • avoid writing javacode on jsp

see also


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