Problem:

Deployment of EJB mapdemo fails..."failed to create deployment package"

Resolution:

Make sure MFJ.CFG is pointing to JAVAC.EXE and MFJAR.CFG to JAR.EXE. These .cfg files are text files:

...Net Express\\Base\\bin\\mfj.cfg

d:\\jdk\\bin\\javac.exe -verbose

...Net Express\\Base\\bin\\mfjar.cfg

d:\\jdk\\bin\\jar.exe