Cannot run a GWT/GAE application using mvn gwt:run using the default pom.xml file

Note the I have not tested this in Windows or Mac OS.

I create an new GWT/GAE app engine project from Roo shell using the following commands

project --topLevelPackage com.test
jpa setup --provider DATANUCLEUS --database GOOGLE_APP_ENGINE
entity jpa --class ~.server.domain.Car
web gwt setup
web gwt all --proxyPackage com.test.client.proxy --requestPackage com.test.client.request

The project scaffolds without error. However, if I exit and run mvn gwt:run I receive the following error:

java.lang.ClassCastException: com.google.appengine.tools.development.ApiProxyLocalImpl cannot be cast to com.google.appengine.tools.development.ApiProxyLocal

Removing the following dependencies in the pom.xml file prior to running mvn gwt:run eliminates the error

<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-testing</artifactId>
<version>1.6.5</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-api-stubs</artifactId>
<version>1.6.5</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-api-labs</artifactId>
<version>1.6.5</version>
<scope>test</scope>
</dependency>