Cannot start a servlet

Folks,

If I try to start a servlet (http://my-host:8001/servlets/SimpleServlet) I get
an error (see stack trace below). What's wrong? I am using JDK 1.2 and have
copied SimpleServlet.class to \Jigsaw\Jigsaw\WWW\servlets. Please reply to my
e-mail address because (up to now) I am not a member of the mailing list. Thanks
much!

     Klaus

java.lang.IllegalAccessError: try to access method org/w3c/tools/resources/event
/ResourceEventMulticaster.<init>(Ljava/util/EventListener;Ljava/util/EventListen
er;)V from class org/w3c/tools/resources/FramedResource
        at org.w3c.tools.resources.FramedResource.addStructureChangedListener(Fr
amedResource.java)
        at org.w3c.jigsaw.servlet.JigsawServletContext.<init>(JigsawServletConte
xt.java)
        at org.w3c.jigsaw.servlet.ServletDirectoryFrame.updateDefaultChildAttrib
utes(ServletDirectoryFrame.java)
        at org.w3c.tools.resources.AbstractContainer.updateDefaultChildAttribute
s(Compiled Code)
        at org.w3c.tools.resources.ContainerResource.updateDefaultChildAttribute
s(ContainerResource.java)
        at org.w3c.tools.resources.DirectoryResource.updateDefaultChildAttribute
s(DirectoryResource.java)
        at org.w3c.tools.resources.ContainerResource.internalLookup(ContainerRes
ource.java)
        at org.w3c.tools.resources.ContainerResource.lookup(Compiled Code)
        at org.w3c.tools.resources.DirectoryResource.lookup(DirectoryResource.ja
va)
        at org.w3c.tools.resources.ContainerResource.lookup(ContainerResource.ja
va)
        at org.w3c.jigsaw.resources.DirectoryResource.lookup(Compiled Code)
        at org.w3c.tools.resources.ContainerResource.lookup(ContainerResource.ja
va)
        at org.w3c.jigsaw.resources.DirectoryResource.lookup(Compiled Code)
        at org.w3c.jigsaw.http.httpd.perform(Compiled Code)
        at org.w3c.jigsaw.http.Client.processRequest(Client.java)
        at org.w3c.jigsaw.http.Client.startConnection(Compiled Code)
        at org.w3c.jigsaw.http.socket.SocketClient.run(SocketClient.java)
        at org.w3c.util.CachedThread.run(Compiled Code)