Dynamic Class Loading - Reflexion failure

[Frank Bourdache <fr...@fr.renault-sport-f1.com>]

Hi,

I am facing problems while loading dynamically classes in my servlet. For my application's purposes, I have to generate java code and compile it on the fly, then use it.
Using standard reflexion mecanisms, I try to instanciate a new testClass object. If it fails, I fork a new process to generate the class, and retry to instanciate this object again.
If testClass.class is not present when I'm starting Tomcat 4.0b6, there is no way i can instanciate a testClass Object. (exceptions are raised in both blocks)
If I put testClass.class in the CLASSPATH, after starting Tomcat 4.0b6, then I can instanciate a testClass Object (no exception raised in the first block, second block not reached)
If I comment out the first block (I always generate the testClass.class file), then everything works fine, but this is unacceptable.
I also tried using classLoader, but failed again.

Don't know if it really is Tomcat related. Any clues ?
Thanks for the help !

Regards,
/Frank


public class LoadClassSample extends HttpServlet {
        ...
        try {
            Class testObjClass = Class.forName("testClass");
            Object testObject = testObjClass.newInstance();
        } catch( ClassNotFoundException CNFException ) {
        
            try {
                Process _proc = Runtime.getRuntime().exec("/usr/lib/java/bin/javac /tmp/testClass.java -d /usr/local/jakarta-tomcat-4.0-b6/webapps/examples/WEB-INF/classes/");
                _proc.waitFor();
                Class testObjClass = Class.forName("testClass");
                Object testObject = testObjClass.newInstance();
                ...                
            } catch( Exception PROCException ) {
                ...
            }
        ...