how to clone shared object in gwt

Hi,

I want to implement audit mechanism for some entity of hibernate. Those entities are in shared package. That mean it will accessible for client and server both package.  

I am doing below steps to achieve audit feature:

->Entity has one variable which hold clone copy of itself 

Just example:

class Data implements Cloneable

{

Data oldData;

public Data getOldDataCopy() {

 return oldDataCopy;

}

public void setOldDataCopy() {

  try {

this.oldDataCopy = (Data) this.clone(); // This will clone this object when I ferxg

} catch (CloneNotSupportedException e) {  

e.printStackTrace();

}

}

}

So while any changes made in object then original copy remained as original stage. 

It throw exception like

[TRACE] [v4workflow] - Finding entry point classes

[ERROR] [v4workflow] - Errors in 'file:/E:/workspace/V4Common_V17/src/com/v4common/shared/beans/workflowengine/Data/Data.java'

[ERROR] [v4workflow] - Line 612: The method clone() is undefined for the type Data

[ERROR] [v4workflow] - Line 613: No source code is available for type java.lang.CloneNotSupportedException; did you forget to inherit a required module?

[ERROR] [v4workflow] - Unable to find type 'com.nextenders.client.WorkFlowEntryPoint'

[ERROR] [v4workflow] - Hint: Previous compiler errors may have made this type unavailable

[ERROR] [v4workflow] - Hint: Check the inheritance chain from your module; it may not be inheriting a required module or a module may not be adding its source path entries properly

[ERROR] [v4workflow] - Failed to load module 'v4workflow' from user agent 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0' at pwd.mp.etenders.in:54479

but As I goggled then came to know that clone does not support with GWT. 

So is there any alternative other then clone? should I have to make copy of each property manually?

Thanks,

Bhumika

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