Merge pull request #1 from wxx5433/master

Get the modification from WXX
Fix some problems
Fixed problems due to recreate new ObjectInputStream and
ObjectOutputSteam on the same socket
Merge branch 'master' of https://github.com/zhouyejoe/DS_ProcessMigration
Merge pull request #2 from zhouyejoe/master

Fixed the bug when creating objectinputstream and objectoutputstream again and again using the same socket