title: fork/join alternative for java 6
body: <p>According to <a href="https://stackoverflow.com/questions/8205874/use-fork-and-join-in-jdk6">this post</a>, <code>ForkJoinPoll</code> can be somehow ported to Java6. However, using openjdk javac 1.6.0_34 I'm unable to compile without warnings any example with described JAR in classpath or run it (<code>java.lang.UnsupportedClassVersionError: jsr166y/RecursiveTask : Unsupported major.minor version 51.0</code>).</p>
  
  <p>So is there any alternative for fork/join model available for Java6?</p>