Yesterday I started playing around with Google App Engine and Java. Today, when I tried upgrading the JDK/VM that Google App Engine is using from Eclipse Galileo to Java 6 in Mac OS X, I got the error below:
com.google.appengine.tools.development.agent.impl.BlackList initBlackList
SEVERE: Unable to read a jre library while constructing the blacklist. Security restrictions may not be entirely emulated. /System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home/lib/plugin.jar
The server is running at http://localhost:8888/
Fortunately, after a bit of searching I found a quick fix.
cd /System/Library/Frameworks/JavaVM.framework/Resources/Deploy.bundle/Contents/Home/lib/
sudo ln -s plugin.jar plugin2.jar
Details taken from: http://groups.google.com/group/google-appe

Thanks, It’s works fine
Thanks Paul… worked for me as well
Cheers,
Johan