title: NoClassDefFoundError: scala/collection/Seq
body: <p>I'm calling a method in a Java class from JRuby via reflection</p>
  
  <pre><code>fact = Factory.factory('aString')
  </code></pre>
  
  <p>calls this method in java</p>
  
  <pre><code>public static Service factory(String url) throws IllegalArgumentException { return new _Service(url); };
  </code></pre>
  
  <p>and I'm getting</p>
  
  <pre><code>Java::JavaLang::NoClassDefFoundError: scala/collection/Seq
  </code></pre>