Need help to get started!

Hi,
I have little experience with Java and JDeveloper. I have to develop a very simple Portlet for our Portal and I just don't know where to look anymore to acheive this. Since this will run in Portal it has to be a Portlet.
This is what I have to acheive with JDeveloper.
I have to show data comming from a database.
1. On the Presentation Page, I want to have a table with a LOV. When a user select, as an example a Department, from the LOV on the Presentation Page, the table will be populate with the value where the Department = the LOV.Department.
Is there a place on OTN I can look for tutorial or example that can be build with JDeveloper but deploy on Portal? There is a lot of tutorial but I am not sure what can be deploy in Portal.
Regards,
Strat

Hi guys,
Finally I have been able to deploy my first Portlet to Portal. I have create a simple Portlet using Oracle PDK Java Portlet Wizard. Now if I can get an answer to the following question I will start putting my business logic to it.
Can someone tell me why I can only run the index.jsp in Jdev. If I try to run the other jsp pages created by the wizard I get an error. There must be something that I have not understand yet so any help will be very appreciate it.
Note. In portal I see all the Anatomy of my Portlet, the help, customize, etc etc.. everything is there.
Thank you!
This is the error.
500 Internal Server Error
java.lang.NullPointerException at htdocs.nemisisfacilities._NemisisFacilitiesShowPage._jspService(NemisisFacilitiesShowPage.jsp:12) [htdocs/nemisisfacilities/NemisisFacilitiesShowPage.jsp] at com.orionserver[Oracle Application Server Containers for J2EE 10g (10.1.2.0.0)].http.OrionHttpJspPage.service(OrionHttpJspPage.java:57) at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:347) at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:509) at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:413) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.0)].server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65) at oracle.security.jazn.oc4j.JAZNFilter.doFilter(Unknown Source) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.0)].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:649) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.0)].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:322) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.0)].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:790) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.0)].server.http.HttpRequestHandler.run(HttpRequestHandler.java:270) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.0)].server.http.HttpRequestHandler.run(HttpRequestHandler.java:112) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.0)].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192) at java.lang.Thread.run(Thread.java:534)

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