| I am using 2nd level cache and I have not a cacheable City entity,
this entity is mapped on a view and I've marked it as @Immutable: @Entity(name="city_view")
@Immutable
class City { @Id private Long id; private String name; } entityManager.createQuery("select c from City c", City.class).getResultList(); java.lang.NullPointerException
at org.hibernate.engine.internal.CacheHelper.fromSharedCache(CacheHelper.java:55)
at org.hibernate.engine.internal.CacheHelper.fromSharedCache(CacheHelper.java:67)
at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1597)
at org.hibernate.loader.Loader.getRow(Loader.java:1515)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:726)
at org.hibernate.loader.Loader.processResultSet(Loader.java:953)
at org.hibernate.loader.Loader.doQuery(Loader.java:921)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:355)
at org.hibernate.loader.Loader.doList(Loader.java:2554)
at org.hibernate.loader.Loader.doList(Loader.java:2540)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2370)
at org.hibernate.loader.Loader.list(Loader.java:2365)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:497)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:387)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:236)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1300)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:103)
at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:573)
at org.hibernate.jpa.internal.QueryImpl.getResultList(QueryImpl.java:449) It can be reproduced just for query, for findOne it's ok. Exception is occurred due to cacheAccessStrategy is null in CacheHelper:
public static Serializable fromSharedCache(
SharedSessionContractImplementor session,
Object cacheKey,
RegionAccessStrategy cacheAccessStrategy) {
final SessionEventListenerManager eventListenerManager = session.getEventListenerManager();
Serializable cachedValue = null;
eventListenerManager.cacheGetStart();
try { cachedValue = (Serializable) *cacheAccessStrategy*.get( session, cacheKey, session.getTimestamp() ); } finally { eventListenerManager.cacheGetEnd( cachedValue != null ); } return cachedValue;
} I've found the place why this piece of code is invoked.
class Loader, method instanceNotYetLoaded:
// see if the entity defines reference caching, and if so use the cached reference (if one).
if ( session.getCacheMode().isGetEnabled() && persister.canUseReferenceCacheEntries() ) {
final Object cachedEntry = CacheHelper.fromSharedCache(
session,
session.generateCacheKey(
key.getIdentifier(),
persister.getEntityMetamodel().getEntityType(),
key.getEntityName()
),
persister.getCacheAccessStrategy()
);
if ( cachedEntry != null ) { CacheEntry entry = (CacheEntry) persister.getCacheEntryStructure().destructure( cachedEntry, factory ); return ( (ReferenceCacheEntryImpl) entry ).getReference(); } } If I disable hibernate.cache.use_reference_entries=false everything is fine. |