title: error while loading CharSequence in Scala 2.11.4 and sbt 0.12.4
body: <p>I have an android-scala project which has subprojects in it. In all <code>build.sbt</code> files I set the scalaVersion:</p>
  
  <p><code>scalaVersion := "2.11.4"</code></p>
  
  <p>and in <code>project/build.properties</code> I set this:</p>
  
  <pre><code>sbt.version=0.12.4
  </code></pre>
  
  <p>However, it keeps generating this (Scala 2.9.2) <code>/home/alex/Documents/projects/android/my_project//project/target/scala-2.9.2/sbt-0.12/classes</code> and it keeps throws an exception when I run sbt by just typing sbt in the root folder:</p>
  
  <pre><code>[error] error while loading CharSequence, class file '/usr/local/java/jdk1.8.0_05/jre/lib/rt.jar(java/lang/CharSequence.class)' is broken
  [error] (bad constant pool tag 15 at byte 1501)
  [error] one error found
  [error] (compile:compile) Compilation failed
  Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore?
  </code></pre>
  
  <p>Yes, I have JDK 8, but I'm using scala <code>2.11.4</code>.</p>
  
  <pre><code> echo $JAVA_HOME
  /usr/local/java/jdk1.8.0_05
  </code></pre>