I'm not using java api but according with documentation it works exactly as 
when you creates a new vertex (as expected) but you have to retrieve it 
before.

Retrieve:
https://github.com/orientechnologies/orientdb/wiki/Document-Database#retrieve-documents

Update:
https://github.com/orientechnologies/orientdb/wiki/Document-Database#update-a-document

If you want to add a new fiels to a document (vertex) just retrieve it and 
write:

myvertex.field( "new_field_name", "new_field_value" );
myvertex.save();

In sql:

update #34:56 set  new_field_name = 'new_field_value' 



On Friday, December 20, 2013 10:57:04 PM UTC+1, Nice Guy wrote:
>
> Hi,
>
> Is there a way to update a vertex to add a new field after it is created?
>
> Right now, I am doing.
> ODocument myVertex;
> myVertex = database.createVertex("TestVertex");
> myVertex.field("firstLable", someText);
>
> Is it possible to add new *Fields * to "TestVertex" after it is created?
>
> Thanks
>

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