title: NoSuchMethodError: org.eclipse.jetty.util.MultiMap.add
body: <p>I loaded my Spring/Maven project in Eclipse (Spring Tools Suite variant), installed Run Jetty Run, and clicked <code>Run Jetty</code>.</p>
  
  <p>PROBLEM: Jetty does not start correctly:</p>
  
  <pre><code>OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=128m; support was removed in 8.0
  Running Jetty 9.0.0.M3
  ParentLoaderPriority enabled
  Enable config class:runjettyrun.webapp.RJRWebInfConfiguration
  Enable config class:org.eclipse.jetty.webapp.WebXmlConfiguration
  Enable config class:runjettyrun.webapp.RJRMetaInfoConfiguration
  Enable config class:org.eclipse.jetty.webapp.FragmentConfiguration
  Enable config class:runjettyrun.annotation.RJRAnnotationConfiguration
  Enable config class:org.eclipse.jetty.webapp.JettyWebXmlConfiguration
  Enable config class:org.eclipse.jetty.webapp.TagLibConfiguration
  ProjectClassLoader: entry=/home/nico/src/nemaki/core/target/classes
  ProjectClassLoader: entry=/home/nico/.m2/repository/javax/servlet/javax.servlet-api/3.0.1/javax.servlet-api-3.0.1.jar
  [... many other JAR libraries, none being Jetty ...]
  ProjectClassLoader: entry=/home/nico/.m2/repository/jp/aegif/nemakiware/nemakiware-common/2.3.10/nemakiware-common-2.3.10.jar
  Excluded entry=/home/nico/src/nemaki/core/target/test-classes 
  2016-09-30 17:17:09.780:INFO:oejs.Server:main: jetty-9.0.0.M3
  2016-09-30 17:17:12.121:WARN:oejuc.AbstractLifeCycle:main: FAILED o.e.j.w.WebAppContext@694e1548{/core,[file:/home/nico/src/nemaki/core/WebContent/],STARTING}: java.lang.NoSuchMethodError: org.eclipse.jetty.util.MultiMap.add(Ljava/lang/Object;Ljava/lang/Object;)V
  java.lang.NoSuchMethodError: org.eclipse.jetty.util.MultiMap.add(Ljava/lang/Object;Ljava/lang/Object;)V
      at org.eclipse.jetty.annotations.ClassInheritanceHandler.handle(ClassInheritanceHandler.java:56)
      at org.eclipse.jetty.annotations.AnnotationParser$MyClassVisitor.visit(AnnotationParser.java:398)
      at org.objectweb.asm.ClassReader.accept(Unknown Source)
  </code></pre>
  
  <p>QUESTION: How can I fix it?</p>