J2EE Engine Web Administration: 404 on /admin/j_security_check

Environment: sneak-preview from June (the latest version), running on a Linux machine.
I'm trying to run the SAP J2EE Engine Web Administration application - i.e. http://b3.lab:50000/admin/LoginForm.jsp .
If I use J2EE_ADMIN/ADMIN for the user/password, I get a 404 screen, for the URL http://b3.lab:50000/admin/j_security_check (The requested resource does not exist.
Details:
Go to main page of this application!)
Note that this is different from a wrong user or password - in this case I get a http://b3.lab:50000/admin/LoginError.html page with an "incorrect username or password" - which is the expected outcome.
Any idea if the application is supposed to work?
BTW - I'm getting quite a few exceptions on other apps as well. For example - the "PC-shop" -> browse -> printer -> click-any-printer gets the exception below:
java.lang.NullPointerException
     at jsp_details1121113843848._jspService(jsp_details1121113843848.java:8)
     at com.sap.engine.services.servlets_jsp.server.servlet.JSPServlet.service(JSPServlet.java:467)
     at com.sap.engine.services.servlets_jsp.server.servlet.JSPServlet.service(JSPServlet.java:181)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
TIA!
Message was edited by: Efri Nattel-Shay
I'm popping up this questions, and raise
Is there any non-trivial J2EE example application that is deployed / can be "tutorially" deployed on the sneak preview Linux version? By non-trivial I mean that it has web, ejb and db portions? (which is pretty modest requirements, I think).
Thank you,
Efri Nattel-Shay

Solution provided is here:
http://wiki.sdn.sap.com/wiki/display/TechTSG/(JSTTSG)(Web)Problems-P148

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