PH37833: ECLIPSELINK CRITERIABUILDER COALESCE CLASSCASTEXCEPTION WHEN USING LITERALS

APAR status

• Closed as program error.

Error description

• When using the method ´coalesce´ with an expression and a
  literal such as:
  
  criteriaBuilder.coalesce(root.get(attribute),0d)
  
  The following exception is thrown:
  ´´´
      Caused by: java.lang.ClassCastException: java.lang.Double
  cannot be cast to
  org.eclipse.persistence.internal.jpa.querydef.InternalSelection
          at
  org.eclipse.persistence.internal.jpa.querydef.CriteriaBuilderImp
  l.coalesce(CriteriaBuilderImpl.java:2117)
  ´´´
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server - Java Persistence API - JPA 2.1 &   *
  *                  EclipseLink                                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: EclipseLink throws a                    *
  *                      ClassCastException when using           *
  *                      literals in CriteriaBuilder Coalesce    *
  *                      expressions                             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When using a CriteriaBuilder coalesce expression with literal
  values, EclipseLink throws an exception as it attempts to cast
  the literal object to an internal object type.
  Example:
  ´´´
  CriteriaQuery<Object[]> criteriaQuery =
  builder.createQuery(Object[].class);
  Root<CoalesceEntity> root =
  criteriaQuery.from(CoalesceEntity.class);
  Subquery<Long> countQuery =
  criteriaQuery.subquery(Long.class);
  Root<CoalesceEntity> countRoot =
  countQuery.from(CoalesceEntity.class);
  countQuery.select(builder.count(countRoot));
  // Pass the literal value directly
  Expression<Long> coalesceExp =
  builder.coalesce(countQuery, 0L);
  criteriaQuery.select(
  builder.array(
  root.get("description"), coalesceExp));
  &#180;&#180;&#180;
  Example Exception:
  &#180;&#180;&#180;
  Caused by: java.lang.ClassCastException: java.lang.Double
  cannot be cast to
  org.eclipse.persistence.internal.jpa.querydef.InternalSelection
  at
  org.eclipse.persistence.internal.jpa.querydef.CriteriaBuilderImp
  l.coalesce(CriteriaBuilderImpl.java:2117)
  &#180;&#180;&#180;
  

Problem conclusion

• The fix for this APAR changes the EclipseLink implementation
  and involves an update to the third-party source. See
  https://bugs.eclipse.org/bugs/show_bug.cgi?id=341074
  
  This fix is currently targeted for WebSphere Application
  Server 9.0.5.9. For more information, see 'Recommended Updates
  for WebSphere Application Server':
  https://www.ibm.com/support/pages/node/715553
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WEBSPHERE APP S

• Fixed component ID

  5724J0800

Applicable component levels

• R900 PSY

     UP