getDeclaredSingularAttribute(name, type) - JPA ManagedType's method

SingularAttribute<X,Y> getDeclaredSingularAttribute(
  String name,
  Class<Y> type

Return the single-valued attribute declared by the managed type that corresponds to the specified name and Java type.
name - the name of the represented attribute
type - the type of the represented attribute
declared single-valued attribute of the given name and type
IllegalArgumentException - if attribute of the given name and type is not declared in the managed type
JPA 2.0

This documentation page is derived (with some adjustments) from the open source JPA 2 RI (EclipseLink)
and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0.
Object Relational Mapping (ORM) JPA 2 providers include Hibernate, EclipseLink, TopLink, OpenJPA and DataNucleus.
ObjectDB is not an ORM JPA implementation but an Object Database for Java with built in JPA 2 support.