Spring Data JPA + JpaSpecificationExecutor + NamedEntityGraph

I have two Entities. Parent and Child.

@Entity
public class Parent {

    @Id
    @Column(name = "PARENT_ID")
    private BigInteger id;

    @Column(name = "FIRST_NAME")
    private String firstName;

    @Column(name = "LAST_NAME")
    private String lastName;
}

@Entity
@NamedEntityGraph(name = "Child.parentObj", attributeNodes = @NamedAttributeNodes("parentObj"))
public class Child{
//blah blah blah

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name="PARENT_ID")
Parent parentObj;

@OneToMany(fetch = FetchType.LAZY)
@JoinColumn(name="CHILD_ID")
Set<Address> address
//blah blah blah
}

ChildRepository.java

public interface ChildRepository extends JpaRepository<T, ID>, JpaSpecificationExecutor<T>{

     @EntityGraph(value="Child.parentObj")
     public List<Child> findAll(Specification<Child> spec);
}

I am trying to find child entities by criteria and it should always have parent.

I am getting exception that it is trying to find parentObj in Address table.

Caused by: org.hibernate.QueryException: could not resolve property: parentObj of: com.xxx.Address [..]

I found this link and tried solution given by Joep but same error.

Spring Data JPA + JpaSpecificationExecutor + EntityGraph

what am I missing. I am not able to understand why/how i limit to look for parentObj in just Child Object as Address has no reference to Parent.

I am doing search by Address.street.

I have tried ad-hoc entity graph too. exception:

org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.QueryException: could not resolve property: parentObj of: com.xxx.Address 

Caused by: org.hibernate.QueryException: could not resolve property: parentObj of: com.xxx.Address
    at org.hibernate.persister.entity.AbstractPropertyMapping.propertyException(AbstractPropertyMapping.java:83)
    at org.hibernate.persister.entity.AbstractPropertyMapping.toType(AbstractPropertyMapping.java:77)
    at org.hibernate.persister.entity.AbstractEntityPersister.toType(AbstractEntityPersister.java:1978)
    at org.hibernate.hql.internal.ast.tree.FromElementType.getPropertyType(FromElementType.java:367)
    at org.hibernate.hql.internal.ast.tree.FromElement.getPropertyType(FromElement.java:500)
    at org.hibernate.engine.query.spi.EntityGraphQueryHint.getFromElements(EntityGraphQueryHint.java:95)
    at org.hibernate.engine.query.spi.EntityGraphQueryHint.toFromElements(EntityGraphQueryHint.java:68)
    at org.hibernate.hql.internal.ast.HqlSqlWalker.processQuery(HqlSqlWalker.java:676)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:665)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.collectionFunctionOrSubselect(HqlSqlBaseWalker.java:4905)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.comparisonExpr(HqlSqlBaseWalker.java:4606)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:2104)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:2029)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:2029)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.whereClause(HqlSqlBaseWalker.java:796)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:597)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:301)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:249)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:278)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:206)
    ... 60 more

I wanted to find Child entries by criteria search and get ParentObj for each child. I wanted to do join and not individual select for Parent. I was trying to solve that by using EntityGraph but it didn't work. As @EKlavya pointed out Specification and EntityGraph don't work togather.

The way I solved was:

root.fetch("parentObj", JOIN.LEFT);

in my toPredicate method. this will get Child entity with Parent in 1 query.