title: Deserialization throws 'ClassNotFoundException: JavaConversions$SeqWrapper' in Scala 2.10
body: <p>I have a fairly complex object graph serialized out from Scala-2.9 and I need to read it into Scala-2.10. However, somewhere deep in the object graph Scala-2.10 throws:</p>
  
  <pre><code>! java.lang.ClassNotFoundException: scala.collection.JavaConversions$SeqWrapper
  ! at java.net.URLClassLoader$1.run(URLClassLoader.java:366) ~[na:1.7.0_21]
  ! at java.net.URLClassLoader$1.run(URLClassLoader.java:355) ~[na:1.7.0_21]
  ! at java.security.AccessController.doPrivileged(Native Method) ~[na:1.7.0_21]
  ! at java.net.URLClassLoader.findClass(URLClassLoader.java:354) ~[na:1.7.0_21]
  ! at java.lang.ClassLoader.loadClass(ClassLoader.java:423) ~[na:1.7.0_21]
  ! at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) ~[na:1.7.0_21]
  ! at java.lang.ClassLoader.loadClass(ClassLoader.java:356) ~[na:1.7.0_21]
  ! at java.lang.Class.forName0(Native Method) ~[na:1.7.0_21]
  ! at java.lang.Class.forName(Class.java:266) ~[na:1.7.0_21]
  ! at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:623) ~[na:1.7.0_21]
  ...
  </code></pre>
  
  <p>What is the simplest way to load this serialized object into Scala-2.10?
  The object deserializes correctly with Scala-2.9, but looks like things have moved around in the standard library. Most of the members of <code>scala.collection.JavaConversions</code> are now in <code>scala.collection.convert.Wrappers</code></p>
  
  <p>Going forward, I am also interested in more robust ways of persisting large complex object graphs without having to explicitly specify the serialization for every class involved.</p>