🚀 go-pugleaf

Using:  Windows NT Server 4.0, Service Pack 3
 JDK 1.1.6 that comes with JBuilder2
 JSDK 2.0


I am having difficulties getting servlets to run reliably with the setup
above.  I start  Servletrunner with the -v option (verbose) in the JSDK
directory.  The output which this  produces suggests all is well:

servletrunner starting with settings:
  port = 8080
  backlog = 50
  max handlers = 100
  timeout = 5000
  servlet dir = .\examples
  document dir = .\examples
  servlet propfile = .\examples\servlet.properties



Next I attempt to use one of the example servlets as follows:

 http://localhost:8080/servlet/SimpleServlet


This usually works.  However trying some of the other example servlets
yields what can best  be described as hit and miss results.   On the
occasions when this fails the connection  eventually times out.  Looking at
the servletrunner's console output I find the following:


java.lang.ClassFormatError
        at
        at sun.servlet.ServletLoader.loadServlet(ServletLoader.java:91)
        at sun.servlet.http.HttpServer.getServlet(Compiled Code)
        at sun.servlet.http.HttpServerHandler.sendResponse(Compiled Code)
        at sun.servlet.http.HttpServerHandler.handleConnection(Compiled
Code)
        at sun.servlet.http.HttpServerHandler.run(Compiled Code)
        at java.lang.Thread.run(Compiled Code)


My first question is: what might cause this problem?  This looks like trace
from the JSDK,  and seems to suggest that the class that it (the HttpServer)
is trying to load is not of the  correct format.   Does this mean that it's
not a valid servlet class - and if so, how, since  the classes nominated are
servlet classes which come as part of the JSDK?


From scanning the srun.c code it seems that what srun.exe /
servletrunner.exe do is simply  to package up a invokation of the HttpServer
application with appropriate environment and  arguments as follows:

 Java.exe sun.servlet.http.HttpServer

I haven't yet started trying to debugg this (I'm hoping I won't have to!).


I apologise if any of the above is already well understood on this
newsgroup - I've only  just started looking at servlets, and only have a
matter of weeks to complete my project!    So far I have to confess it has
been a dispiriting experience.  Instead of being able to  concentrate on the
business of writing the software, I have expended a great amount of time
and energy on set-up issues - so far to no useful effect.

If anyone can point me to a good FAQ on dealing with the problems above, or
recommend a good approach to working around these problems I would be very
grateful.


Ed Barrett