Can't Set App Engine SDK - Eclipse Plugin

Hi,

I have been trying to set up a Maven/GWT/Eclipse project and keep
running into road blocks. I have Eclipse 3.6 (Helios) with m2eclipse
and GWT plugins installed. I was trying with Eclipse 3.5 (Galileo)
but thought I may have messed up some config thing and figured I'd
start clean and upgrade to Helios. I get the same issue in both.

I have been trying to use this blog as a guide for setting up my
project:

http://googlewebtoolkit.blogspot.com/2010/08/how-to-use-google-plugin-for-eclipse.html

I have a project set up in the standard Maven directory structure. I
created a new Eclipse project and used this as the existing source
(deleted .project, .classpath and .settings that were created in
Galileo). I then ran the mvn clean gae:unpack war:war and mvn
eclipse:clean eclipse:eclipse as per the blog.

When I go into the project properties and try to set the Google App
Engine to "Use default SDK (App Engine - 1.3.7)" and save, it doesn't
stick. I go back in and it's still set at "Use specific SDK" which is
set to "{userHome}\.m2\repository\com\google\appengine - unknown
version". If I choose "App Engine - 1.3.7" from the list and save, it
still reverts to the local repo "unkown version".

When I check my Java Build Path, all the jars from the local repo are
listed. I can delete them and save, but again, it doesn't stick.

I tried running the project to see what happens, and I get:

Exception in thread "main" java.lang.ExceptionInInitializerError
at
com.google.appengine.tools.info.SdkImplInfo.<clinit>(SdkImplInfo.java:
19)
at
com.google.appengine.tools.util.Logging.initializeLogging(Logging.java:
36)
at
com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:
72)
at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:421)
at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1035)
at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:783)
at com.google.gwt.dev.DevMode.main(DevMode.java:275)
Caused by: java.lang.RuntimeException: Unable to discover the Google
App Engine SDK root. This code should be loaded from the SDK
directory, but was instead loaded from file:{userHome}/.m2/repository/
com/google/appengine/appengine-tools-sdk/1.3.7/appengine-tools-
sdk-1.3.7.jar. Specify -Dappengine.sdk.root to override the SDK
location.
at com.google.appengine.tools.info.SdkInfo.findSdkRoot(SdkInfo.java:
106)
at com.google.appengine.tools.info.SdkInfo.<clinit>(SdkInfo.java:24)
... 7 more

What gives??

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