Java Development Tools

I downloaded JDev 9.0.4.1.1 and started working on a small school project. Everything was going fine with my simple servelets while I was going thru several layers to talk to an Oracle database. Well, I changed some code to talk to a Cloudscape/Derby db and now the server won't launch. I'm not sure why, tho. The code compiles fine and all the messages from the embedded server seem to be normal. Here are the messages:

[Starting OC4J using the following ports: HTTP=8988, RMI=23891, JMS=9227.]
C:\Flanakin\Windows\Programs\JDeveloper\jdk\bin\javaw.exe -ojvm -classpath C:\Flanakin\Windows\Programs\JDeveloper\j2ee\home\oc4j.jar -Xverify:none -Doracle.j2ee.dont.use.memory.archive=true -Doracle.j2ee.http.socket.timeout=500 -Doracle.dms.sensors=NONE -Doc4j.jms.usePersistenceLockFiles=false com.evermind.server.OC4JServer -config C:\Flanakin\Windows\Programs\JDeveloper\jdev\system9.0.4.1.1.1436\oc4j-config\server.xml
[waiting for the server to complete its initialization...]
Embedded OC4J startup time: 8843 ms.
04/11/28 11:36:54 Oracle Application Server Containers for J2EE 10g (9.0.4.0.0) initialized

The status bar still says, "Starting Embedded OC4J Server." But, normally, a browser window pops up and loads the servlet, and that's not happening.

I tested the new code against a command-line tool and it works fine, so I'm not sure what's going on. Does anyone have any ideas? Any way I could test this to find out what might be happening is appreciated.

Thanks in advance!