Problem migration from SAP JCO 2.1 to SAP JCO 3.0

Goodmorning,
I need information to migrate my code written in java from SAP JCO 2.1 to SAP JCO 3.0 and IDOC to ver. 3.0
I read SAP JCo 2.x-3.0( Standalone)Migration Guide, but some information I don't found.

I have these methods
JCO.removeClientPool(poolName)
JCoIDoc.createRepository(String, String)
Idoc.Document.getName()
In which way I can substitute these methods in SAP JCO 3.0/IDOC ver. 3.0 ?

In my code there this class
JCO.Pool
what is the equivalent in SAP JCO 3.0/IDOC ver. 3.0 ?

In my code I have a class child of a the class
JCoIDoc.Server
that ovveride this method
protected void handleRequest(JCoFunction function), protected void handleRequest(IDocDocumentList documentList), protected boolean onCheckTID(String tid), protected void onCommit(String tid),
protected void onRollback(String tid), protected void onConfirmTID(String tid)
In SAP JCO 3.0/IDOC ver. 3.0 what can I do ?
I have try to create a child of DefaultJCoIDocServer, but those methods are not possible to override.

If you are not the right contact, can you give me the email address for the right contact ?

Thank you
Best Regards
Fabrizio