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config.getInitParameter  RSS feed

 
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Hi I'm trying to access an intialisation parameter in a jsp file.
My web.xml file has the following entry
<servlet>
<servlet-name>Jsp1</servlet-name>
<display-name>Jsp1</display-name>
<jsp-file>/Jsp1.jsp</jsp-file>
<init-param>
<param-name>myInitial</param-name>
<param-value>Y</param-value>
</init-param>
</servlet>
Using config.getInitParameter("myInitial")in the JSP always returns null!!!
Has anyone else had these problems and sorted it out.
TIA Graham
 
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You might be confusing servlet init params with context init params.
Call getInitParameter on the servlet itself (i.e. remove the "config.") and this should fix your problem.
Cheers
 
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hi,
let me disagree with the last post. to use the context parameters you set the <context-param>
tag, and not <init-param>.
i guess you get your init parametes == null because you have to call your servlets with path which includes your <servlet-name> and not the direct path.
 
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I know this was a while ago. but I got the answer for you. The problem was after you set up your servlet context for your JSP, you need to set up a servlet mapping so the web server can map the servlet context to your jsp! Like this:
 
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Hi Graham
I suspect you may be calling the JSP file directly, instead of using the deployment decriptor configuration.
That is, if you call your JSP file with:

then you will definitely get a null return from config.getInitParameter("myInitial").
However, if you invoke your JSP file with:

then you should get your desired result.
Hope this helps
Mark
 
Robert Paris
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Mark,
Yes, but even though he set Servlet-Name, if he has no servlet mapping, then you're idea won't work.
 
Mark Howard
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Robert
It wasn't just an idea. I ran Graham's code that he supplied in his post and it worked. Servlet mapping is definitely not a pre-req to locating a JSP page.
 
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You definitely don't have to use servlet mappings if you set your init-param's in your web.xml like this:

then to call it from a jsp you just use:
getServletContext().getInitParameter("name");
-Pat
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