我正在使用安装了m2eclipse和GWT Eclipse插件的Eclipse 3.5（Galileo）。我使用gwt-maven-plugin原型创建了一个项目。我创建了使用这些类定义的RPC服务：
my.package.client.DataService
my.package.client.DataServiceAsync
my.package.server.DataServiceImpl
当我运行时mvn clean，目标目录将被删除（如预期的那样）。运行时gwt:compile gwt:run -X -e，出现错误：
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile (default-compile) on project MyProject: Compilation failure
C:\Devel\EclipseProjects\MyProject\target\generated-sources\gwt\my\package\client\DataServiceAsync.java:[8,7] duplicate class: my.project.client.DataServiceAsync
-> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile (default-compile) on project MyProject: Compilation failure
C:\Devel\EclipseProjects\MyProject\target\generated-sources\gwt\my\package\client\DataServiceAsync.java:[8,7] duplicate class: my.project.client.DataServiceAsync
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:581)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeForkedExecutions(DefaultLifecycleExecutor.java:685)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:560)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:324)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:247)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:104)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:427)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:157)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:121)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.CompilationFailureException: Compilation failure
C:\Devel\EclipseProjects\MyProject\target\generated-sources\gwt\my\package\client\DataServiceAsync.java:[8,7] duplicate class: my.project.client.DataServiceAsync
at org.apache.maven.plugin.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:516)
at org.apache.maven.plugin.CompilerMojo.execute(CompilerMojo.java:114)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:105)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:577)
... 16 more
[ERROR]
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
失败后，将使用以下目录结构以及其中的单个文件创建目标目录：
MyProject/target/generated-sources/gwt/my/project/client/DataServiceAsync.java
由于目标目录在运行之前不存在gwt:compile gwt:run -X -e，因此必须已创建目录并已复制java类作为执行目标的一部分。那么，为什么目标现在会抱怨类重复？
任何帮助是极大的赞赏！
我发现此帖子指出：
如果您手动创建Async接口，则必须在插件配置中禁用generateAsync目标
解决方法是<goal>generateAsync</goal>从我的pom.xml中删除。插件配置现在看起来像：
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>1.2</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>test</goal>
</goals>
</execution>
</executions>
<configuration>
<runTarget>my.package.Application/Application.html</runTarget>
</configuration>
</plugin>
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我来说两句