neo4j - How to use exists, findOne and other GraphRepository methods, taking id as argument? -

let assume following:

1). have 2 entities:

@nodeentity public class {         @graphid     private long id;     ... }  @nodeentity public class b {         @graphid     private long id;     ... } 

2). have 2 appropriate repositories:

public interface arepository extends graphrepository<a> {     ...     }  public interface brepository extends graphrepository<b> {     ...     } 

3). , have following nodes in database:

• a id=1
• b id=2

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case a: assume need check whether id=2 exists:

arepository.exists(2) 

i expect return false, since id=2 isn't exists. returns true, since tries find among ids, not among nodes.

case b: or maybe need find b id=1:

brepository.findone(1); 

i expect returns null or throws appropriate exception, informing b id=1 isn't exists. throws unexpected me persistententityconversionexception.

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hence questions:

• how can use aforementioned operations expected behavior?
• may there workaround?