title: NoSuchMethodError with GWT
body: <p>I had a GWT app that was working fine. Then I added <code>guava-r09.jar</code> and <code>guava-r09-gwt.jar</code>, and messed around with the build path a bit. Now, when I try to launch my app in hosted mode, I get this error:</p>
  
  <pre><code>Caused by: java.lang.NoSuchMethodError: java.util.Set.java_lang_Iterable_iterator()Ljava/util/Iterator;
      at com.google.gwt.user.cellview.client.CellBasedWidgetImpl.sinkEvents(CellBasedWidgetImpl.java:117)
      at com.google.gwt.user.cellview.client.AbstractHasData.(AbstractHasData.java:279)
      at com.google.gwt.user.cellview.client.CellList.(CellList.java:211)
      at com.google.gwt.user.cellview.client.CellList.(CellList.java:175)
      at com.my.client.myMainView.(MainView.java:33)
  </code></pre>
  
  <p>I have found various sites that propose solutions (<a href="http://blog.timmattison.com/archives/2009/11/08/how-to-fix-error-unexpected-java-lang-nosuchmethoderror-messages-when-compiling-gwt-code-in-eclipse/" rel="nofollow">Tim Mattisson's blog</a> and <a href="http://forgetmenotes.blogspot.com/2009/05/gwteclipse-nosuchmethoderror.html" rel="nofollow">ForgetMeNotes</a>). I took the advice they listed there (re-ordering the build path), but my problem persists. What could I be doing wrong?</p>