You are viewing a plain text version of this content. The canonical link for it is here.
Posted to users@tomcat.apache.org by Mufaddal <mu...@wmotion.com> on 2003/02/14 08:09:13 UTC
JSP - NullPointerException is being thrown ... does anyone know why and what needs to be corrected ?
I have a jsp page which has the following code in it.
<% if(session.isNew() == false &&
session.getAttribute("XYZ").equals("true"))
{
%>
// do some HTML
<% }
else
{
%>
// do some HTML
<%
}
%>
The following exception is thrown:
java.lang.NullPointerException
at
include._0002finclude_0002fheader_0002ejspheader_jsp_1._jspService(_0002
finclude_0002fheader_0002ejspheader_jsp_1.java:65)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.jasper.servlet.JspServlet$JspCountedServlet.service(JspServle
t.java:130)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServle
t.java:282)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
at org.apache.tomcat.core.Handler.service(Handler.java:287)
at
org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at
org.apache.tomcat.facade.RequestDispatcherImpl.doInclude(RequestDispatch
erImpl.java:400)
at
org.apache.tomcat.facade.RequestDispatcherImpl.include(RequestDispatcher
Impl.java:270)
at
org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:4
14)
at
login._0002flogin_0002fLogin_0002ejspLogin_jsp_0._jspService(_0002flogin
_0002fLogin_0002ejspLogin_jsp_0.java:63)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.jasper.servlet.JspServlet$JspCountedServlet.service(JspServle
t.java:130)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServle
t.java:282)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
at org.apache.tomcat.core.Handler.service(Handler.java:287)
at
org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.jav
a:806)
at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:752)
at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(H
ttpConnectionHandler.java:213)
at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416
)
at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:50
1)
at java.lang.Thread.run(Thread.java:554)
I am suspecting that since my session object is not created ? or
invalid ? this exception pops up. this jsp page is included in another
jsp page called Boo.jsp. I access Boo.jsp the first time i client logs
in. Why is this exception being thrown .. any leads ?
Thanks.
Re: JSP - NullPointerException is being thrown ... does anyone know why and what needs to be corrected ?
Posted by Mufaddal <mu...@wmotion.com>.
Found the bug.
basically i need to check if session.getAttribute("param") == null or
not before using that object .
thanks.
On Friday, February 14, 2003, at 12:39 PM, Mufaddal wrote:
> I have a jsp page which has the following code in it.
>
> <% if(session.isNew() == false &&
> session.getAttribute("XYZ").equals("true"))
> {
> %>
> // do some HTML
> <% }
> else
> {
> %>
> // do some HTML
> <%
> }
> %>
>
> The following exception is thrown:
>
> java.lang.NullPointerException
> at
> include._0002finclude_0002fheader_0002ejspheader_jsp_1._jspService(_000
> 2finclude_0002fheader_0002ejspheader_jsp_1.java:65)
> at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
> org.apache.jasper.servlet.JspServlet$JspCountedServlet.service(JspServl
> et.java:130)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
> org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServl
> et.java:282)
> at
> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429
> )
> at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
> org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405
> )
> at org.apache.tomcat.core.Handler.service(Handler.java:287)
> at
> org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
> at
> org.apache.tomcat.facade.RequestDispatcherImpl.doInclude(RequestDispatc
> herImpl.java:400)
> at
> org.apache.tomcat.facade.RequestDispatcherImpl.include(RequestDispatche
> rImpl.java:270)
> at
> org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:
> 414)
> at
> login._0002flogin_0002fLogin_0002ejspLogin_jsp_0._jspService(_0002flogi
> n_0002fLogin_0002ejspLogin_jsp_0.java:63)
> at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
> org.apache.jasper.servlet.JspServlet$JspCountedServlet.service(JspServl
> et.java:130)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
> org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServl
> et.java:282)
> at
> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429
> )
> at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
> org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405
> )
> at org.apache.tomcat.core.Handler.service(Handler.java:287)
> at
> org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
> at
> org.apache.tomcat.core.ContextManager.internalService(ContextManager.ja
> va:806)
> at
> org.apache.tomcat.core.ContextManager.service(ContextManager.java:752)
> at
> org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(
> HttpConnectionHandler.java:213)
> at
> org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:41
> 6)
> at
> org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:5
> 01)
> at java.lang.Thread.run(Thread.java:554)
>
> I am suspecting that since my session object is not created ? or
> invalid ? this exception pops up. this jsp page is included in another
> jsp page called Boo.jsp. I access Boo.jsp the first time i client logs
> in. Why is this exception being thrown .. any leads ?
>
> Thanks.
---------------------------------------------------------------------
To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: tomcat-user-help@jakarta.apache.org