title: Exception from sonarqube scan when using using kafka (or scala in general?)
body: <p>I have a java project that uses kafka. im scanning it with sonarqube 5.0 (sonar maven plugin 2.5), and i get this:</p>
  
  <pre><code>[INFO] [13:48:22.488] Sensor JavaSquidSensor...
  [INFO] [13:48:22.511] Java Main Files AST scan...
  [INFO] [13:48:22.512] 8 source files to be analyzed
  [ERROR] [13:48:22.655] Class not found: scala.Predef$$less
  [ERROR] [13:48:22.655] Class not found: scala.Predef$$less$colon
  [ERROR] [13:48:22.680] Class not found: scala.collection.immutable.Stream$$hash
  [ERROR] [13:48:22.680] Class not found: scala.collection.immutable.Stream$$hash$colon
  [ERROR] [13:48:22.685] Unable to create symbol table for : /path/to/KafkaNotifier.java
  java.lang.IllegalStateException: Innerclass: colon and classSymbol: Stream are not the same.
      at com.google.common.base.Preconditions.checkState(Preconditions.java:145) ~[sonar-batch-maven-compat-5.0.jar:na]
      at org.sonar.java.resolve.BytecodeVisitor.defineInnerClass(BytecodeVisitor.java:162) ~[java-squid-2.9.1.jar:na]
      at org.sonar.java.resolve.BytecodeVisitor.visitInnerClass(BytecodeVisitor.java:144) ~[java-squid-2.9.1.jar:na]
      at org.objectweb.asm.ClassReader.accept(ClassReader.java:679) ~[asm-debug-all-5.0.3.jar:5.0.3]
      at org.objectweb.asm.ClassReader.accept(ClassReader.java:506) ~[asm-debug-all-5.0.3.jar:5.0.3]
      at org.sonar.java.resolve.BytecodeCompleter.complete(BytecodeCompleter.java:100) ~[java-squid-2.9.1.jar:na]
      at org.sonar.java.resolve.Symbol.complete(Symbol.java:98) ~[java-squid-2.9.1.jar:na]
      at org.sonar.java.resolve.BytecodeVisitor$ReadType.visitEnd(BytecodeVisitor.java:541) ~[java-squid-2.9.1.jar:na]
  ...lots more ommitted
  </code></pre>
  
  <p>i get this for every class that uses kafka.</p>
  
  <p>am i missing a configuration?</p>
  
  <p>is this a squid bug?</p>