I hear you loud and clear. There's really no way that you could be
getting "null" from that method invocation (unless of course, your query
string looks like http://...?name1=null).
Printing the return value of getParameter("name1") will print "null" or
"", however.
Are you using the JServ module? Send me a test servlet.
-Rob
On Wed, 14 Apr 1999, Jason Proctor wrote:
> I think you may be misunderstanding me. In the situation where I'm
> processing a request for a URL like
>
> http://whatever.com/servlets?name1=&name2=someVal
>
> getParameter (name1) should return either a null pointer or a blank string.
> Right now, I'm getting the string value "null", ie a four character string
> containing the characters 'n', 'u', 'l', 'l', as though somewhere someone
> is doing an implicit string conversion (eg String s = "" + null will give s
> = "null").
>
> This is wrong, isn't it?
>
>
> >HttpServletRequest.getParameter("name1") should return "" in the case of a
> >URL like
> http://whatever.com/servlets?name1=&name2=someVal
> >
> >Regardless, this is still problematic, since you probably want that value
> >to be null.
> >
> >What I've done to get around this is provide my servlets with the
> >following method:
> >
> >private String getParameter(HttpServletRequest req, String parameterName)
> >throws NullParameterException {
> > String value = req.getParameter(parameterName);
> > if ( (value == null) || (value.equals("") )
> > throw new NullParameterException(parameterName);
> > return value;
> >}
> >
> >And define a NullParameterException with a method like:
> >public String getParameterName()
> >and a constructor like the one used above:
> >public NullParameterException(String parameterName)
> >so that you can later find out which parameter was not passed. It comes
> >in handy when you're checking for required form fields and the like.
> >
> >Hope this helps.
> >
> >-Rob
> >
> >On Tue, 13 Apr 1999, Jason Proctor wrote:
> >
> >> I'm seeing some weird behaviour with parameters that are passed to servlets
> >> as blank strings, ie in a URL such as
> >> http://machine/zone/servlet?param1=¶m2=. These parameters end up having
> >> the value "null" (ie a 4-character string) rather than either a blank
> >> string or a null pointer, which is what I would expect.
> >>
> >> Here's the code -
> >>
> >> Enumeration parmNames = inRequest.getParameterNames();
> >>
> >> while ( parmNames.hasMoreElements() )
> >> {
> >> String key = (String) parmNames.nextElement();
> >>
> >> String value = inRequest.getParameter( key );
> >>
> >> // value == "null" here
> >> // in case where parameter is passed as ?name=&name=value
> >> }
> >>
> >> Any ideas anyone? Thanks in advance.
> >>
> >>
> >>
> >>
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>
>
>
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