Java Web App for EP5 SP5

Question

Hi
Recently I developed a Java web app for a Portal client.  The client is on EP5 SP5 with ITS and LDAP servers (a 3 server architecture).  I then used the deployment tool to create the necessary ear file and then successfully deployed it to the SAP J2EE Engine.  I then navigated to the following url:
http://<portal_server>:8100/<web_app>/welcome.jsp
However I am having trouble with the following:
1) the jsp pages are not being rendered properly.  in fact welcome.jsp does not have any jsp tags at all but I am still getting a compiling exception.  as soon as I change the extension to .html the page is displayed fine.  issue: why am i not able to view the jsp pages.  error: com.inqmy.services.servlets_jsp.jsp.CompilingException ID 17013
2) the web app I have developed utilises the sapjco functionality to connect to the relevant R3 system.  in my web app directory structure I have included the necessary sapjco.jar in the WEB-INF/lib directory but get the attached jco error. (I shouldnt need to set the classpath since the sapjaco.jar file must get picked up from WEB-INF/lib directory).  Error: At times I get a NoClassDefFoundError stopping at the line which requires the sapjco.jar file (where it uses JCo.Pool class) and at other times I get the "could not load middleware layer".
I have tried numerous things to fix it but in vain.  Any thoughts around how I could go about resolving the issues will be greatly appreciated. 
Willing to provide screenshots if required.
Cheers
Ankit

Answer 1

Hi Alon
Thanks a lot for the info!!
I have read the doco you asked me to have a look at and it sounds reasonable.  But the question that I have is that is it possible to successfully include the relevant jar's in the application's WEB-INF\lib folder?? I ask this since I would expect the SAP j2ee class loader to look at the required jar's in the WEB-INF\lib folder?!? (Also the section on "Adding a Reference from a Deployed Application to a Service or Library" talks about an app that may want to use resources from OUTSIDE the application EAR.)
So if I use any jar's such as sapjco, xerces, activation and mail I will need to add them to the library.txt if they are not already there (which they should be since the portal uses them) and then add the reference in reference.txt.
Your thoughts will be appreciated.
Cheers
Ankit