Solved, happily humming along ... ;) (Re: OOo 2.0.1: Java-interface on RH FC 3 not finding

staroffice-news.germany.sun.com" type="cite">The JNI and Rexx stuff is irrelevant here. ; Its as simple as this:

 AppClassLoader   --knows-->  UNO classes (via CLASSPATH)
  |         ;        directly...
  |
  ...and indirectly...
  |
  v
 ExtClassLoader   --knows-->  your classes (via ext dir)
  |         ;        directly...
  |
  ...and indirectly...
  |
  v
 BootstrapClassLoader --knows-->  java.lang etc. (hardcoded)
       ;           ;      directly

If your classes call Class.ForName("someUNOclass", true, ExtClassLoader) (as they do when they simply call Class.ForName("someUNOclass")), that wont work. ; If your classes want to use UNO, they need to be loaded by a classloader that knows (directly or indirectly) the UNO classes.  Hence, if your classes shall be loaded by ExtClassLoader, the UNO classes would need to be loaded by ExtClassLoader, too.

   /* create a desktop object, request the XDesktop interface from it and
      request the XComponentLoader interface from that                        */
componentLoader = UNO.createDesktop()~XDesktop~XComponentLoader

   /* use the XComponentLoader interface function "loadComponentFromUrl()" to
      create a writer component (= word processor document)                   */
writerComponent = componentLoader~loadComponentFromURL("private:factory/swriter", "_blank", 0, .UNO~noProps)

   /* get the XTextDocument interface from the writerComponent and use its function
      getText() to get a hold of the text object                              */
text = writerComponent~XTextDocument~getText

   /* set the text of the text object to salute the world                     */
text~setString("Hello OpenOffice.org/StarOffice, this is ooRexx speaking! ("date("S") time()")")

::requires UNO.CLS   /* directive to get the UNO support for ooRexx, defines utility classes, routines */
  

/* Hello World in ooRexx, cf. http://www.ooRexx.org, version: 2006-01-06 */
xScriptContext=uno.getScriptContext()     -- get the xScriptContext object

oDoc=xScriptContext~getDocument           -- get the document service (an XModel object)
-- oDesktop=xScriptContext~getDesktop           -- get the desktop (an XDesktop object)
-- oContext=xScriptContext~getComponentContext  -- get the context(an XComponentContext object)

xTextDoc=oDoc~XTextDocument               -- get the XTextDocument interface from the document
hello="Hello World (in ooRexx) "          -- define text to add
xTextDoc~getText~getEnd~setString(hello)  -- add text at the end of the text document


::requires UNO.CLS   -- load UNO support for OpenOffice.org