which JDK version should I use?

I'm trying to get Oracle Portal to work, but when I try to access any pages, I get errors. In my jserv.log I get the following error:

[07/05/2001 20:35:13:974] (ERROR) ajp12: Servlet Error: java.lang.ExceptionInIni
[07/05/2001 20:35:13:974] (ERROR) an error returned handling request via protoco
[07/05/2001 20:35:13:935 CEST] page/Unexpected exception in servlet

java.lang.ClassNotFoundException: java.util.HashMap                             
        at org.apache.java.lang.AdaptiveClassLoader.loadClass(Compiled Code)    
        at java.lang.ClassLoader.loadClassInternal(Compiled Code)               
        at oracle.webdb.page.PageBuilder.<init>(Compiled Code)                  
        at oracle.webdb.page.ParallelServlet.doGet(Compiled Code)               
        at javax.servlet.http.HttpServlet.service(Compiled Code)                
        at javax.servlet.http.HttpServlet.service(Compiled Code)                
        at org.apache.jserv.JServConnection.processRequest(Compiled Code)       
        at org.apache.jserv.JServConnection.run(Compiled Code)                  
        at java.lang.Thread.run(Compiled Code)   [07/05/2001 20:35:13:974] 

I think the version of JDK that I use is inncorrect - there is no HashMap.class in it.
I also had to comment one line in Jserv properties:  wrapper.classpath=/opt/oracle/OraApp/Apache/jdk/lib/tools.jar because I don't have tools.jar file.

So - what version should I use?
I'm using RedHat Linux if it helps
Tia
Rafal Received on Mon May 07 2001 - 20:44:26 CEST