I was able to get a preview release of the Google AppEngine SDK for Java last week, and finally had an opportunity to play with it. I installed Eclipse on my 64bit Ubuntu Linux box and all the plugins as suggested by Google's Java docs. Everything worked great until I tried to debug the default app as generated by the Eclipse Plugin.
I got an error in the GWT (Google Web Toolkit) packages saying (among other things)
libswt-pi-gtk-3235.so: wrong ELF class: ELFCLASS32 (Possible cause: architecture word width mismatch)
With a little digging, I found that this was related to 32bit compiled java libraries being run under the 64bit Java runtime. The solution is to install the 32bit Java runtime binary, and instruct Eclipse to use it.
#From Terminal
sudo apt-get install sun-java-6-bin ia32-sun-java6-bin
sudo apt-get remove gij
sudo update-alternatives --config java
# Select the 32bit runtime
From Eclipse go to Window -> Preferences -> Java -> Installed JRE's -> Add -> Standard VM and use the path /usr/lib/jvm/ia32-java-6-sun-1.6.0.13
Now you can Run -> Debug As -> Web Application
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