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POCreating an Akka fat Jar
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  1. POCreating an Akka fat Jar
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    copied!<p>I need to create a Nutch plugin that communicate with some external applications using Akka. In order to do this, I need to package the plugin as a fat Jar - I am using <a href="https://github.com/sbt/sbt-assembly/" rel="nofollow">sbt-assembly</a> version 0.8.3.</p> <p>When I try to run the plugin, I get the exception </p> <pre><code>com.typesafe.config.ConfigException$Missing: No configuration setting found for key 'akka' </code></pre> <p>as if Akka was not able to find <code>reference.conf</code>. This is weird, because <code>sbt-assembly</code> <a href="http://letitcrash.com/post/21706121997/follow-up-sbt-assembly-now-likes-reference-conf" rel="nofollow">should be able</a> to package that file correctly, and in fact I can see its content in the created jar.</p> <p>My <code>build.sbt</code> looks like this:</p> <pre><code>import AssemblyKeys._ name := "my-project" version := "0.1-SNAPSHOT" scalaVersion := "2.10.0" resolvers ++= Seq( "Central Repo" at "http://repo1.maven.org/maven2", "Typesafe Repository" at "http://repo.typesafe.com/typesafe/releases/", "Akka io" at "http://akka.io/repository" ) libraryDependencies ++= Seq( ..., "com.typesafe.akka" %% "akka-actor" % "2.1.1", "com.typesafe.akka" %% "akka-remote" % "2.1.1" ) seq(assemblySettings: _*) mergeStrategy in assembly &lt;&lt;= (mergeStrategy in assembly) { (old) =&gt; { case "plugin.xml" =&gt; MergeStrategy.first case x if x startsWith "org/apache/jasper" =&gt; MergeStrategy.last case x if x startsWith "javax/xml" =&gt; MergeStrategy.last case x if x startsWith "javax/servlet" =&gt; MergeStrategy.last case x if x startsWith "org/apache/commons" =&gt; MergeStrategy.last case x if x startsWith "org/apache/xmlcommons" =&gt; MergeStrategy.last case x if x startsWith "org/xml/sax" =&gt; MergeStrategy.last case x if x startsWith "org/w3c/dom" =&gt; MergeStrategy.last case x =&gt; old(x) } } </code></pre> <p>The last lines are needed to fix some conflicts between nutch and hadoop.</p> <blockquote> <p>What is the correct way to package an Akka application?</p> </blockquote>
 

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