Problem with jsp:include Tag

[dmjpro]

<jsp:include flush="true" page="test_include.jsp?a=<%=java_variable%>&b=debasis&c=jana" />
 

But the value of Java variable is not getting passed to the include page.
If i pass plain hard coded value then it's getting passed.
What should i be doing?

[JosAH]

@dmjpro
The several tags <% ... %> and <%= ... %> and <%@ ... %> and <%! ... %> don't nest properly in JSP; those tags don't change it a bit; imho that entire JSP syntax stinks. I find JSPs just a hack that got out of hand. You've just met one of its quircks.

kind regards,

Jos

[dmjpro]

Actually this thing can be achieved by using <jsp:param name="param_name" value="<%=expression%>"/>.

[JosAH]

@dmjpro
See? Another crappy solution because of that silly JSP syntax. Did you just find this hack?

kind regards,

Jos

[chaarmann]

There is a better solution. The jsp-tags aren't very flexible, and you can always do the same with pure Java. if you don't know how to do it in Java, just look at the corresponding java file that is the compiled jsp-file, placed in "work" directory of apache. There you can see how jasper translated your jsp-directives into java-code.

My problem was similar to yours. Here is my solution:
What for example if you want to have different menus on your webpages and the jsp-file for the menu (along with different parameters if needed) should be passed in runtime? Let's say I call "http://myServer/fullPage.jsp?topMenu=myTop.jsp"

here is fullPage.jsp:

<%!
private boolean includeIfExisting(String pageName, PageContext pageContext)
throws Exception
{
    HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();
    String url = request.getParameter(pageName);
    if (url != null)
    {
        if (Log.isDebug()) Log.debug("before including " + pageName + " =" + url);
        pageContext.include(url);
        if (Log.isDebug()) Log.debug("after including " + pageName + " =" + url);
 
        return true;
    }
    return false;
}
%>
...
<div id=menu>
<%
    includeIfExisting("topMenu", pageContext);
%>
</div>
...