how to get init-param in jsp

[omi sharma]

I am not able to get init-param in jsp. please tell me how to get it?

 
<%!
public void jspInit()
{
ServletConfig sConfig=getServletConfig();
ServletContext sc=getServletContext();
sc.setAttribute("mail",sConfig.getInitParameter("mail"));
}
%>
<%= getServletConfig().getInitParameter("mail") %>
<%=getServletContext().getAttribute("mail")%>

From above code you can see that I tried two ways to get init-param without
success ,I only get nulls .

 
<web-app>
<servlet>
<servlet-name>TestServlet</servlet-name>
<jsp-file>/Test.jsp</jsp-file>
<init-param>
<param-name>mail</param-name>
<param-value>[e-mail]</param-value>
</init-param>
<servlet-class>TestServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>TestServlet</servlet-name>
<url-pattern>/Hobby.do</url-pattern>
</servlet-mapping>
</web-app>

best regards,
omi

[nav katoch]

Try with application.getInitParameter(" ")

Thanks, Naveen.

[nav katoch]

Disregard the contents of the previous post. Try this way:-

<%! String emailHost = null;
String webMaster = null;
public void jspInit() {
ServletConfig config = getServletConfig();
emailHost = config.getInitParameter("emailHost");
webMaster = config.getInitParameter("webMaster");
}
%>

[John Stone]

try to remove this line from DD:
<servlet-class>TestServlet</servlet-class>

[omi sharma]

Originally posted by n katoch:
Disregard the contents of the previous post. Try this way:-

<%! String emailHost = null;
String webMaster = null;
public void jspInit() {
ServletConfig config = getServletConfig();
emailHost = config.getInitParameter("emailHost");
webMaster = config.getInitParameter("webMaster");
}
%>

You did the same thing I did ,Please give a second thought of my post.
Declaring variable outside the jspInit method doesn't change the output because we have to set attribute inside the method.
It's not working.

best regards,
omi

[omi sharma]

Originally posted by John Stone:
try to remove this line from DD:
<servlet-class>TestServlet</servlet-class>

LOL,what made you think if I remove the line ,it will be fine.

My friend,It will get bigger problem as big fat null pointer exception.

best regards,
omi

[omi sharma]

The main problem is getInitParameter() does not get parameter for me,
neither as stand-alone nor inside the method.

best regards,
omi

[John Stone]

LOL,what made you think if I remove the line ,it will be fine.

The fact, that you have both <jsp-file> and <servlet-class> used in one <servlet> element.

[omi sharma]

So any idea? why I am getting nulls?

best regards,
omi

[John Stone]

What URL are you typing in address bar?
/Test.jsp
or
/Hobby.do?

[John Stone]

*.jsp is implicitly mapped to org.apache.jasper.servlet.JspServlet, so if you are writing .jsp in address bar, that could be the reason.

from http://faq.javaranch.com/view?InvokerServlet

''SRV.11.2.1 Implicit Mappings''
...
If the container has an internal JSP container, the *.jsp extension is mapped to it,
allowing JSP pages to be executed on demand. This mapping is termed an implicit mapping.
If a *.jsp mapping is defined by the web application,
its mapping takes precedence over the implicit mapping.
...
A servlet container is allowed to make other implicit mappings
as long as explicit mappings take precedence.

[omi sharma]

Originally posted by John Stone:
What URL are you typing in address bar?
/Test.jsp
or
/Hobby.do?

I am trying to access /Hobby.do via form.

forget my problem, the real question is how to access init-param in jsp?
(not context-param)

applicaion.getInItParameter() is for context-param so what for init-param?

best regards,
omi
[ May 23, 2008: Message edited by: omi sharma ]

[nav katoch]

config

[omi sharma]

Originally posted by n katoch:
config

Yea that's for init-param but the funny thing is it is also getting null
like others. LOL

But after setting deployment descriptor according to this code , it's working fine.

   
<web-app>
<servlet>
<servlet-name>TestServlet</servlet-name>
<jsp-file>/TestInit.jsp</jsp-file>
<init-param>
<param-name>mail</param-name>
<param-value>[e-mail]</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>TestServlet</servlet-name>
<url-pattern>/TestInit.jsp</url-pattern>
</servlet-mapping>
</web-app>

Actually init-param is not for jsp it's for servlet for jsp we use
context-param like a charm.

John isn't that the same you were trying tell me?

thanks guys for replies

best regards,
omi
[ May 23, 2008: Message edited by: omi sharma ]

[John Stone]

I took your code, removed <servlet-class> element, accessed the page via /Hobby.do and I can see init params.

<%!
public void jspInit()
{
  ServletConfig sConfig=getServletConfig();
  ServletContext sc=getServletContext();
  sc.setAttribute("mail",sConfig.getInitParameter("mail"));
}
%>
<%= getServletConfig().getInitParameter("mail") %>
<%= getServletContext().getAttribute("mail") %>
<%= getServletName() %>

<web-app>
<servlet>
  <servlet-name>TestServlet</servlet-name>
  <jsp-file>/p1.jsp</jsp-file>
    <init-param>
      <param-name>mail</param-name>
      <param-value>[e-mail]</param-value>
    </init-param>
</servlet>
 
<servlet-mapping>
  <servlet-name>TestServlet</servlet-name>
  <url-pattern>/Hobby.do</url-pattern>
</servlet-mapping>
 
</web-app>

output:

[e-mail] [e-mail] TestServlet

[omi sharma]

LOL,I think we both were posting at the same time

thanks John

best regards,
omi
[ May 23, 2008: Message edited by: omi sharma ]

[Vijay Bharghav bheemineni]

Hi Omi,

I feel that your statement "Actually init-param is not for jsp it's for servlet for jsp we use context-param like a charm" is "wrong".

Jsp is nothing but finally Servlet. We can also set "init-param" to JSP. Your solution of "<context-param>" is just alternate solution but you didn't fix the root cause.

John was right, actual problem is we can't have both "<jsp-file>" and "<servlet-class>" tag, at any time we can have only "<jsp-file>" or <servlet-class>" tag.

I would request you to check the first version of the code by removing the "<servlet-class>" tag.

Thanks.

Vijay Bheemineni.

[omi sharma]

Originally posted by Vijay Bharghav bheemineni:
Hi Omi,

I feel that your statement "Actually init-param is not for jsp it's for servlet for jsp we use context-param like a charm" is "wrong".


John was right, actual problem is we can't have both "<jsp-file>" and "<servlet-class>" tag, at any time we can have only "<jsp-file>" or <servlet-class>" tag.


I would request you to check the first version of the code by removing the "<servlet-class>" tag.

Well my dear ,jsp is servlet for container not for client.
If jsp is really servlet for client ,then please tell me why do we need
to use <jsp-file> element in DD?


Yes , I know John was right.I did not know the whole story because I had
form-parameters to access via servlet and then process it in jsp and a model java class.When I tried to remove <servlet-class> I got null-pointer exception so that time I thought what was he talking about.Later I knew what did he mean.

I already solved my problem. Thank you for reply.

best regards,
omi
[ May 23, 2008: Message edited by: omi sharma ]

[Cosmin Nicolae Vacaroiu]

Yes, servlet-class must be removed. You either have the servlet from servlet-class, or the servlet generated by the jsp-file.

It shoud work:
<% out.print(pageContext.getServletConfig().getInitParameter("name")); %>

ps: in EL you can't get them.