Java – you cannot successfully create a project using GWT Maven plugin with GWT 2.2

I am completing a GWT project according to the documents of GWT Maven plugin and Google Web toolkit blog, but it is not successful

Using eclipse 3.6, I use archetype GWT Maven plugin 2.1 0-1 created a new Maven project

I follow the instructions found here, Google Web toolkit blog, but it doesn't work I get an exception:

java.lang.NoClassDefFoundError: com/google/appengine/tools/enhancer/Enhance
Caused by: java.lang.ClassNotFoundException: com.google.appengine.tools.enhancer.Enhance
    at java.net.urlclassloader$1.run(UnkNown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.urlclassloader.findClass(UnkNown Source)
    at java.lang.ClassLoader.loadClass(UnkNown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(UnkNown Source)
    at java.lang.ClassLoader.loadClass(UnkNown Source)
Exception in thread "main" 

I use gae 1.4 in the Google Eclipse Plug-in GWT 2.2 in 2 0. My POM The same version number is used in the XML

This is the generated POM xml. It uses 2.1 0 version of GWT, but I manually changed it to 2.2 0

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

  <!-- POM file generated with GWT webAppCreator -->
  <modelVersion>4.0.0</modelVersion>
  <groupId>gwt-comet</groupId>
  <artifactId>gwt-comet-5</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>GWT Maven Archetype</name>

  <properties>
    <!-- Convenience property to set the GWT version -->
    <gwtVersion>2.2.0</gwtVersion>
    <!-- GWT needs at least java 1.5 -->
    <maven.compiler.source>1.5</maven.compiler.source>
    <maven.compiler.target>1.5</maven.compiler.target>
    <webappDirectory>${project.build.directory}/${project.build.finalName}</webappDirectory>
  </properties>

  <dependencies>
    <dependency>
      <groupId>com.google.gwt</groupId>
      <artifactId>gwt-servlet</artifactId>
      <version>2.2.0</version>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>com.google.gwt</groupId>
      <artifactId>gwt-user</artifactId>
      <version>2.2.0</version>
      <scope>provided</scope>
    </dependency>  
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.7</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <!-- Generate compiled stuff in the folder used for developing mode -->
    <outputDirectory>${webappDirectory}/WEB-INF/classes</outputDirectory>

    <plugins>

      <!-- GWT Maven Plugin -->
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>gwt-maven-plugin</artifactId>
        <version>2.1.0-1</version>
        <executions>
          <execution>
            <goals>
              <goal>compile</goal>
              <goal>test</goal>
              <goal>i18n</goal>
              <goal>generateAsync</goal>
            </goals>
          </execution>
        </executions>
        <!-- Plugin configuration. There are many available options,see gwt-maven-plugin 
          documentation at codehaus.org -->
        <configuration>
          <runTarget>Comet.html</runTarget>
          <hostedWebapp>${webappDirectory}</hostedWebapp>
          <i18nMessagesBundle>fr.client.Messages</i18nMessagesBundle>
        </configuration>
      </plugin>

      <!-- Copy static web files before executing gwt:run -->
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.1.1</version>
        <executions>
          <execution>
            <phase>compile</phase>
            <goals>
              <goal>exploded</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
          <webappDirectory>${webappDirectory}</webappDirectory>
        </configuration>
      </plugin>

    </plugins>
  </build>

</project>

Thanks for your help.

Solution

I don't use it with gae, but there is an updated version of GWT Maven plugin for 2.2 Set it to 2.2 0 or delete the version tag, it will get the latest tag There are no gae dependencies in your POM