I'm trying to use Class.forName in the startup of an application
running in Orion.
It simply does not work.
Here is a piece of the code:
System.out.println("Class to use for logging " +
classtouse);
Class classname = logclass;
try {
System.out.println("1");
logclass = Class.forName(classtouse);
//logclass =
Logging.class.getClassLoader().loadClass(classtouse);
System.out.println("2");
} catch (ClassNotFoundException e) {
System.out.println("3");
System.err.println("Could not find class " +
classtouse);
System.out.println("4");
System.err.println(e.toString());
System.out.println("5");
logclass = classname;
System.out.println("6");
}
System.out.println("7");
System.out.println("OK");
} catch (Exception e) {
System.out.println("8");
System.err.println("Exception during parsing: " + e);
}
And what do we see when we start Orion with this application:
Class to use for logging org.mmbase.util.logging.log4j.Log4jImpl
1
Orion/1.4.5 initialized
You see, after '1' it simply stops, and we see in the log and when we
try to see a page:
java.lang.NoClassDefFoundError: org.mmbase.servlet.JamesServlet
which does not make sense to me, because I'm sure that this class
_does_ exist, and I dont' get this message if I cut away this specific
code with 'forName'.
I've searched with google, and found someone with the same problem,
which was called a bug in orion by someone else:
see
http://www.google.com/search?q=cache:list.working-dogs.com/lists/turbine/Turbine%2520Digest%252002-13-00+forName+orionserver&hl=en
(would that URL be reliable?, well, a few cites from it:
[[
> Turbine class and other are loaded correctly with the servlet class =
loader,
> But Class.forName() break this logic as it goes directly to the Global
> system class loader.
Right. In that case, what should happen is this:
Class.forName() is called in the scope of orion's custom classloader. The
systemclassloader is then asked to find the class. When it can't find it,
then the custom class loader should attempt to find the class. It sounds
like this part is what isn't happening and is a bug in the orion
classloader.
> I guess it is possible to hide the problem by modify the server =
classpath
> but this is a dirty hack :(
...
> I am not familiar with Turbine code and I am not sure what is the right
> approach here, or if this is a problem. What do you think?
Tell the people who make Orion to fix their broken classloader. This is a
prime example of why people shouldn't write closed source servlet engines.
]]
Was this a bug indeed? Is it solved? It there a workaround? Does
anyone understand what I mean?
Michiel
--
Michiel Meeuwissen - NOS internet
Mediacentrum kamer 203 - tel. +31 (0)35 6773065
http://www.mmbase.org
http://www.purl.org/NET/mihxil/
