title: GWT upgrade from 2.7.0. to 2.8.2 (or 2.8.1) not working
body: <p>I am trying to upgrade my Eclipse (Mars 2, Mac) project that uses Google app engine and GWT to gwt version 2.8.2 but I get the following error:</p>
  
  <pre><code>Exception in thread "main" java.lang.NoSuchMethodError: com.google.gwt.util.regexfilter.RegexFilter: method &lt;init&gt;()V not found
      at com.google.gwt.util.regexfilter.WhitelistRegexFilter.&lt;init&gt;(WhitelistRegexFilter.java:21)
      at com.google.gwt.dev.jjs.JJSOptionsImpl.&lt;init&gt;(JJSOptionsImpl.java:54)
      at com.google.gwt.dev.PrecompileTaskOptionsImpl.&lt;init&gt;(PrecompileTaskOptionsImpl.java:39)
      at com.google.gwt.dev.CompilerOptionsImpl.&lt;init&gt;(CompilerOptionsImpl.java:30)
      at com.google.gwt.dev.Compiler.main(Compiler.java:108)
  </code></pre>
  
  <p>I fount solutions to have my java compiler level and java facet to 1.8, but it's not working. </p>
  
  <p>Also in my classpath i have :</p>
  
  <pre><code>&lt;classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.launching.macosx.MacOSXType/Java SE 8 [1.8.0_172]"&gt;
          &lt;attributes&gt;
              &lt;attribute name="owner.project.facets" value="java"/&gt;
          &lt;/attributes&gt;
      &lt;/classpathentry&gt;
  </code></pre>