Hi,
I am dropping this note after spending hours trying to figure out why
my webapp encounters an NPE trying to obtain a param from request.
Scenario:
Moving an old web app from JRun to Tomcat 5.5.23. The app uses custom
taglibs that provide for user authentication and login and this is
where I am encountering the issue. When I try and input the username
and password in the Login form for the admin console and submit it, I
get the following error (and trace).
Much appreciate if anyone can shed some light, or have any suggestions.
Thanks in advance,
Rahul
----- Quoted Error ----
HTTP Status 500
type Exception report
message
description The server encountered an internal error () that prevented
it from fulfilling this request.
exception org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:476)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:389)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause java.lang.NullPointerException
java.util.Hashtable.get(Hashtable.java:333)
org.apache.tomcat.util.http.Parameters.getParameterValues(Parameters.java:193)
org.apache.tomcat.util.http.Parameters.getParameter(Parameters.java:238)
org.apache.catalina.connector.Request.getParameter(Request.java:1007)
org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:353)
eluminet.wlp.modules.users.servlet.tags.UserLoginTag.doStartTag(UserLoginTag.java:101)
org.apache.jsp.admin.index_jsp._jspService(index_jsp.java:81)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
----- End of Error -----
Also, here is the relevant snippet from the taglib handler
implementation which is blowing up on the first call to
pageContext.getRequest ().getParameter (username).
----- quote ----
username = pageContext.getRequest ().getParameter (username);
System.out.println ("param : 'username' , value: '" +
username + "'");
password = pageContext.getRequest ().getParameter (password);
System.out.println ("param : 'password' , value: '" +
password + "'");
logout = pageContext.getRequest ().getParameter (logout);
System.out.println ("param : 'logout' , value: '" + logout + "'");
------ end quote -----
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