In case you are playing with 2.8.0-SNAPSHOT, today we got a 402 calling this:
A workaround is to add gwt-dev and gwt-pom as dependencies:
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt</artifactId>
<version>${gwtVersion}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt</artifactId>
<version>${gwtVersion}</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-dev</artifactId>
<version>${gwtVersion}</version>
<scope>provided</scope>
</dependency>
...
...
and then disable that repo for the plugin:
<pluginRepositories>
<pluginRepository>
<id>google-maven-snapshot-repository-plugin</id>
<name>Google Maven Snapshot Repository</name>
<url>https://oss.sonatype.org/content/repositories/google-snapshots/</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
<pluginRepository>
<id>nexus-snapshot</id>
<url>https://nexus.codehaus.org/content/repositories/snapshots/</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>false</enabled>
</snapshots>
</pluginRepository>
<pluginRepository>
<id>nexus-disabled</id>
<url>http://nexus.codehaus.org/snapshots/</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>false</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
Ciao
L.