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Asked: 2026-05-11T12:46:16+00:00

My entity has a named query which looks like this: @NamedQuery(name = Person.find, query

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My entity has a named query which looks like this:

@NamedQuery(name = 'Person.find', query = 'select p from Organization p where p.name=:NAME')

In my code I want to set the query cache hint:

query.setHint('eclipselink.cache-usage', 'CheckCacheThenDatabase');

If I try to get whole result list:

List<Person> result = query.getResultList();

EclipseLink throws an exception:

Exception [EclipseLink-6124] (Eclipse Persistence Services - 1.0.1 (Build 20080905)): org.eclipse.persistence.exceptions.QueryException Exception Description: Required query of class org.eclipse.persistence.queries.ReadAllQuery, found class org.eclipse.persistence.queries.ReadObjectQuery

If I try to get only a single result, it works:

Person person = query.getSingleResult();

If I remove the query hint, then getResultList() works also.

I don’t understand the exception – isn’t it saying that it is specifically expecting getResultList()?? What am I doing wrong?

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1 Answer

  1. EclipseLink documentation says:

    ‘EclipseLink does not support the cache usage for native queries or queries that have complex result sets such as returning data or multiple objects.’

    Also the documentation says:

    ‘CheckCacheThenDatabase – You can configure any read-object query to check the cache completely before you resort to accessing the database.’

    So the behaviour seems to be ok, I just found the exception misleading.

    EDIT: Try something like this in the entity definition, that should be enough: (Coded on the web page so there can be errors)

    Entity @Cache(expiry = 3600000, // 1 hour size = 10000) @NamedQueries({   @NamedQuery(name = 'Person.findByPK', query = 'select p from Person p ' +   'where p.name=:NAME',   hints = {     @QueryHint(name = QueryHints.CACHE_USAGE,     value = CacheUsage.CheckCacheThenDatabase),     @QueryHint(name = QueryHints.QUERY_TYPE, value = QueryType.ReadObject)   } })
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