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 Post subject: setParameter for where clause leads to NullpointerException
PostPosted: Thu Feb 16, 2017 3:14 am 
Newbie

Joined: Wed Feb 15, 2017 11:32 am
Posts: 2
Hi all!

I'm using hibernate-core 5.2.6.Final for querying Views from an Oracle-SQL Server (Oracle10gDialect).
I've generated both POJO and StaticMetaModel files.
In hibernate.cfg.xml I'm mapping to the POJO entity class.

I'm not allowed to post original company code, but the StaticMetaModel looks like:
Code:
@Generated(value = "org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor")
@StaticMetamodel(MyEntity.class)
public abstract class MyEntity_ {

   public static volatile SingularAttribute<MyEntity, String> someId;
   public static volatile SingularAttribute<MyEntity, Long> someLong;                  // NUMBER(4)
}


I can query the view when adding a where-clause for someId.
But when I additionally add someLong to the where-clause i get a NullpointerException.

Code:
java.lang.NullPointerException
   at org.hibernate.query.criteria.internal.compile.CriteriaQueryTypeQueryAdapter.setParameter(CriteriaQueryTypeQueryAdapter.java:375)
   at org.hibernate.query.criteria.internal.compile.CriteriaQueryTypeQueryAdapter.setParameter(CriteriaQueryTypeQueryAdapter.java:57)
        .....


The query looks like this:

Code:
   public Collection<MyEntity> readData(String id, long longValue) {
      EntityManager em = this.getSession().getEntityManagerFactory().createEntityManager();
      CriteriaBuilder cb = em.getCriteriaBuilder();
      
      CriteriaQuery<MyEntity> q = cb.createQuery(MyEntity.class);
      Root<MyEntity> root = q.from(MyEntity.class);
   
      ParameterExpression<Long> pSomeLong = cb.parameter(Long.class);
      q.where(cb.equal(root.get(MyEntity_.someLong), pSomeLong ));
      ParameterExpression<String> pSomeId = cb.parameter(String.class);
      q.where(cb.equal(root.get(MyEntity_.someId), pSomeId ));
      
      TypedQuery<MyEntity> query = em.createQuery(q);
      query.setParameter(pSomeId , id);
      query.setParameter(pSomeLong , longValue);   // crash happens here

      return query.getResultList();
   }


The exception occurs when I call query.setParameter(pSomeLong , longValue).

Here is the POJO:
Code:
@Entity
@Table(name = "MY_ENTITY_VIEW", schema = "SOME_SCHEMA", catalog = "")
public class MyEntity implements java.io.Serializable {
   /**
    *
    */
   private static final long serialVersionUID = -7508480021949722883L;
   private Long someLong;
   private String someId;

   @Basic
   @Column(name = "LONG_FIELD")
   public Long getSomeLong() {
      return someLong;
   }

   public void setSomeLong(Long someLong) {
      this.someLong = someLong;
   }

   @Id
   @Basic
   @Column(name = "SOME_ID")
   public String getSomeId() {
      return someId;
   }

   public void setSomeId(String someId) {
      this.someId = someId;
   }
}


When debugging the Hibernate code i can see that resolveParameterInfo returns a NullReference (CriteriaQueryTypeQueryAdapter):

Code:
   @Override
   @SuppressWarnings({ "unchecked" })
   public <T> QueryImplementor<X> setParameter(Parameter<T> param, T t) {
      entityManager.checkOpen( false );
      final ExplicitParameterInfo parameterInfo = resolveParameterInfo( param );  // ---> returns null
      if ( parameterInfo.isNamed() ) {
         jpqlQuery.setParameter( parameterInfo.getName(), t );
      }
      else {
         jpqlQuery.setParameter( parameterInfo.getPosition(), t );
      }
      return this;
   }


Does anyone have an idea what's going wrong here?
Any hints welcome.

Thanks in advance.

Regards,
Jo


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 Post subject: Re: SetParameter for where-Clause leads to NullpointerException
PostPosted: Thu Feb 16, 2017 4:15 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 976
You are overriding the where clause with your second q.where call so Hibernate will not never find the "pSomeLong" paremeter:

Code:
q.where(cb.equal(root.get(MyEntity_.someLong), pSomeLong ));
ParameterExpression<String> pSomeId = cb.parameter(String.class);
q.where(cb.equal(root.get(MyEntity_.someId), pSomeId ));


What you need to do is to pass both parameters to a single WHERE clause method call.

Code:
ParameterExpression<Long> pSomeLong = cb.parameter(Long.class);
ParameterExpression<String> pSomeId = cb.parameter(String.class);

q.where(
      cb.equal( root.get(MyEntity_.someLong), pSomeLong ),
      cb.equal( root.get(MyEntity_.someId    ), pSomeId     )
);

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 Post subject: Re: setParameter for where clause leads to NullpointerException
PostPosted: Thu Feb 16, 2017 4:40 am 
Newbie

Joined: Wed Feb 15, 2017 11:32 am
Posts: 2
Thanks a lot! What a mistake.


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 Post subject: Re: setParameter for where clause leads to NullpointerException
PostPosted: Thu Feb 16, 2017 4:46 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 976
I'm glad it worked.

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If you liked my answer, you are going to love my High-Performance Java Persistence book and my blog as well.


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