JPA Method
in javax.persistence.Subgraph

Subgraph<X> addSubgraph(
  Attribute<T,X> attribute
)


Add a node to the graph that corresponds to a managed type. This allows for construction of multi-node entity graphs that include related managed types.
Parameters:
attribute - attribute
Return:
subgraph for the attribute
Throws:
IllegalArgumentException - if the attribute's target type is not a managed type
IllegalStateException - if the EntityGraph has been statically defined
Since:
JPA 2.1