SBT程序集插件的DeDuplication错误

我正在尝试使用SBT程序集插件创建一个可执行jar.

我最终得到以下错误:

[error] (app/*:assembly) deduplicate: different file contents found in the following:
[error] /Users/rajeevprasanna/.ivy2/cache/org.eclipse.jetty.orbit/javax.servlet/orbits/javax.servlet-3.0.0.v201112011016.jar:about.html
[error] /Users/rajeevprasanna/.ivy2/cache/org.eclipse.jetty/jetty-continuation/jars/jetty-continuation-8.1.8.v20121106.jar:about.html
[error] /Users/rajeevprasanna/.ivy2/cache/org.eclipse.jetty/jetty-http/jars/jetty-http-8.1.8.v20121106.jar:about.html
[error] /Users/rajeevprasanna/.ivy2/cache/org.eclipse.jetty/jetty-io/jars/jetty-io-8.1.8.v20121106.jar:about.html
[error] /Users/rajeevprasanna/.ivy2/cache/org.eclipse.jetty/jetty-security/jars/jetty-security-8.1.8.v20121106.jar:about.html
[error] /Users/rajeevprasanna/.ivy2/cache/org.eclipse.jetty/jetty-server/jars/jetty-server-8.1.8.v20121106.jar:about.html
[error] /Users/rajeevprasanna/.ivy2/cache/org.eclipse.jetty/jetty-servlet/jars/jetty-servlet-8.1.8.v20121106.jar:about.html
[error] /Users/rajeevprasanna/.ivy2/cache/org.eclipse.jetty/jetty-util/jars/jetty-util-8.1.8.v20121106.jar:about.html
[error] /Users/rajeevprasanna/.ivy2/cache/org.eclipse.jetty/jetty-webapp/jars/jetty-webapp-8.1.8.v20121106.jar:about.html
[error] /Users/rajeevprasanna/.ivy2/cache/org.eclipse.jetty/jetty-xml/jars/jetty-xml-8.1.8.v20121106.jar:about.html
[error] Total time: 2562 s, completed Dec 5, 2013 12:03:25 PM

在阅读了程序集插件的wiki后,我在build.scala文件中添加了合并策略.似乎它不起作用.我不确定它是否正确修复.有人可以建议我正确的策略.

下面是我在build.scala文件中的代码:

mergeStrategy in assembly <<= (mergeStrategy in assembly) {
      (old) => {
        case "about.html" => MergeStrategy.discard
        case "logback.xml" => MergeStrategy.first //case PathList("logback.xml") => MergeStrategy.discard
        case x => old(x)
      }
    }

我根据此文档编写了与我的应用程序的插件集成:Scalatra servlet的独立部署

我尝试了不同的策略,如MergeStrategy.rename和MergeStrategy.deduplicate.但没有任何作用..寻求帮助......