OptionalDataException while reading from Gemfire cache

Hi,

I'm getting OptionalDataException while reading from Gemfire cache region. I'm just trying to read all objects in a region by calling entrySet() and iterating through.

I know the problem is while deserializing and usually happen due to unread primitive data, or the end of data belonging to a serialized object in the stream (http://docs.oracle.com/javase/6/docs/api/java/io/OptionalDataException.html), however here it's all gemfire internals, i don't have written any code to searilize/desearilze objects.

We are using Gemfire 6.6.3 with JDK 6. Any help is greatly appreciated. Thanks in advance.