title: Intellij 12 and internal compilation error when building scala project
body: <p>I have just downloaded Intellij 12.01 (build #IC-123.94) and once I try to build a Scala project I get the following stacktrace:</p>
  
  <pre><code>Internal error: (java.lang.ClassNotFoundException) org.jetbrains.jps.incremental.BinaryContent
  java.lang.ClassNotFoundException: org.jetbrains.jps.incremental.BinaryContent
      at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
      at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
      at org.jetbrains.jps.incremental.scala.LazyCompiledClass.&lt;init&gt;(ScalaBuilder.scala:239)
      at org.jetbrains.jps.incremental.scala.IdeClient.generated(ScalaBuilder.scala:230)
      at org.jetbrains.jps.incremental.scala.remote.ClientEventProcessor.process(ClientEventProcessor.scala:17)
      at org.jetbrains.jps.incremental.scala.remote.RemoteServer$.liftedTree1$1(RemoteServer.scala:76)
      at org.jetbrains.jps.incremental.scala.remote.RemoteServer$.org$jetbrains$jps$incremental$scala$remote$RemoteServer$$handle(RemoteServer.scala:74)
      at org.jetbrains.jps.incremental.scala.remote.RemoteServer$$anonfun$send$1$$anonfun$apply$1$$anonfun$apply$3.apply(RemoteServer.scala:44)
      at org.jetbrains.jps.incremental.scala.remote.RemoteServer$$anonfun$send$1$$anonfun$apply$1$$anonfun$apply$3.apply(RemoteServer.scala:43)
      at org.jetbrains.jps.incremental.scala.package$.using(package.scala:15)
      at org.jetbrains.jps.incremental.scala.remote.RemoteServer$$anonfun$send$1$$anonfun$apply$1.apply(RemoteServer.scala:43)
      at org.jetbrains.jps.incremental.scala.remote.RemoteServer$$anonfun$send$1$$anonfun$apply$1.apply(RemoteServer.scala:40)
      at org.jetbrains.jps.incremental.scala.package$.using(package.scala:15)
      at org.jetbrains.jps.incremental.scala.remote.RemoteServer$$anonfun$send$1.apply(RemoteServer.scala:40)
      at org.jetbrains.jps.incremental.scala.remote.RemoteServer$$anonfun$send$1.apply(RemoteServer.scala:39)
      at org.jetbrains.jps.incremental.scala.package$.using(package.scala:15)
      at org.jetbrains.jps.incremental.scala.remote.RemoteServer.send(RemoteServer.scala:39)
      at org.jetbrains.jps.incremental.scala.remote.RemoteServer.compile(RemoteServer.scala:24)
      at org.jetbrains.jps.incremental.scala.ScalaBuilder$$anonfun$5$$anonfun$apply$3$$anonfun$apply$4.apply(ScalaBuilder.scala:110)
      at org.jetbrains.jps.incremental.scala.ScalaBuilder$$anonfun$5$$anonfun$apply$3$$anonfun$apply$4.apply(ScalaBuilder.scala:100)
      at scala.util.Either$RightProjection.map(Either.scala:536)
      at org.jetbrains.jps.incremental.scala.ScalaBuilder$$anonfun$5$$anonfun$apply$3.apply(ScalaBuilder.scala:100)
      at org.jetbrains.jps.incremental.scala.ScalaBuilder$$anonfun$5$$anonfun$apply$3.apply(ScalaBuilder.scala:99)
      at scala.util.Either$RightProjection.flatMap(Either.scala:523)
      at org.jetbrains.jps.incremental.scala.ScalaBuilder$$anonfun$5.apply(ScalaBuilder.scala:99)
      at org.jetbrains.jps.incremental.scala.ScalaBuilder$$anonfun$5.apply(ScalaBuilder.scala:98)
      at scala.util.Either$RightProjection.flatMap(Either.scala:523)
      at org.jetbrains.jps.incremental.scala.ScalaBuilder.doBuild(ScalaBuilder.scala:98)
      at org.jetbrains.jps.incremental.scala.ScalaBuilder.build(ScalaBuilder.scala:67)
      at org.jetbrains.jps.incremental.scala.ScalaBuilderService$ScalaBuilderDecorator.build(ScalaBuilderService.java:42)
      at org.jetbrains.jps.incremental.IncProjectBuilder.runModuleLevelBuilders(IncProjectBuilder.java:963)
      at org.jetbrains.jps.incremental.IncProjectBuilder.runBuildersForChunk(IncProjectBuilder.java:710)
      at org.jetbrains.jps.incremental.IncProjectBuilder.buildTargetsChunk(IncProjectBuilder.java:740)
      at org.jetbrains.jps.incremental.IncProjectBuilder.buildChunkIfAffected(IncProjectBuilder.java:673)
      at org.jetbrains.jps.incremental.IncProjectBuilder.buildChunks(IncProjectBuilder.java:494)
      at org.jetbrains.jps.incremental.IncProjectBuilder.runBuild(IncProjectBuilder.java:274)
      at org.jetbrains.jps.incremental.IncProjectBuilder.build(IncProjectBuilder.java:164)
      at org.jetbrains.jps.cmdline.BuildRunner.runBuild(BuildRunner.java:114)
      at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:205)
      at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:102)
      at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler$1.run(BuildMain.java:107)
      at org.jetbrains.jps.service.impl.SharedThreadPoolImpl$1.run(SharedThreadPoolImpl.java:26)
      at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
      at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
      at java.util.concurrent.FutureTask.run(FutureTask.java:138)
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
      at java.lang.Thread.run(Thread.java:662)
  </code></pre>
  
  <p>Apparently, the problem comes from the openapi.jar inside the Intellij's lib folder, which was supposed to contain such a class.</p>
  
  <p>Any pointers? </p>
  
  <p>Regards.</p>