Precompiled JSP slower than Postcompiled JSP

[evantoliopoulos]

Hi All,

I am noticing that when I deploy precompiled JSP, they (the servlets) are executing much slower than when I let JBoss/Jetty compile them. When I say much slower, I mean ten times slower. That is, a very processing intensive page that is postcompiled takes 5 seconds to generate the resultant HTML whereas when precompiled it take 58 seconds.

(This particular page used JSTL tags utilising expression language and produces a medium sized table)

BTW,

I compile .jsp files into .java files using the same jspC that ships with JBoss v3.0.4. In fact pre and post compiled .java files are 99% identical.

Then I compile the .java files into .class files using the standard javac v1.4.1_02. I have already tried turning debug off and optimize on.

Then of course I merge the generated servlet descriptors into the web.xml file.

I have not been able to find mention of any configuration settings that may help in either the JBoss or Jetty manuals. And my forum searches also brought up nothing that I thought may be relevant.

Has anyone else seen this and know how to fix it?

Thanks,
Evan

[evantoliopoulos]

i have just upgraded to JBoss3.2.0RC3 and am also using the newer jasper for precompilation.

to borrow a phrase used by someone else elsewhere in these forum pages, it now runs like a scalded cat!

i cannot really tell if the precompiled is still slower than the postcompiled because, well really, tens or even hundreds of milliseconds mean nothing to me.

cheers,
evan.

[jpierre.p]

Hello,

As I can see, you know how to use pre-compiled JSP.

I’m trying to do this and currently on the middle of the way. I’m able to produce the java and class files with the jspc Ant task, but not the servlet descriptions. I know that I should add the classes under WEB-INF/classes or putting them in a jar under WEB-INF/lib and add the servlet definitions in web.xml. Have I anything else to do for having jetty using the pre-compiled JPSs ? Can you tell me about the procedure or give a link on documentation ? Are the servlet definitions mandatory even if the jsp are never called directly, but always through requestDispatcher.forward(…) as with Struts ?

Thanks in advance,
Best regards,
Jean-Pierre

[iramesh]

Hi Jean-Pierre,
Please check out the jboss-jetty FAQ site. I have pasted the link below. Once there, search for "JSP Precompilation". Hope this helps.

Link : http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/jboss/contrib/jetty/FAQ?rev=HEAD&content-type=text/vnd.viewcvs-markup