Github user huafengw commented on the pull request:
https://github.com/apache/incubator-gearpump/pull/20#issuecomment-219916439
That's overriding Java's default serialization implementation:
```
There is, however, a strange yet crafty solution. By using a built-in
feature of the serialization mechanism, developers can enhance the normal
process by providing two methods inside their class files. Those methods are:
private void writeObject(ObjectOutputStream out) throws IOException;
private void readObject(ObjectInputStream in) throws IOException,
ClassNotFoundException;
```
From http://www.oracle.com/technetwork/articles/java/javaserial-1536170.html
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