Hi,
We're using a JPA entity with a byte array that can be very large (> 50M). The entity is defined as follows:
Code:
@Entity
@Name("record")
@Scope(SESSION)
public class Record implements Serializable {
private static final long serialVersionUID = 1491449501828459427L;
@Id
@GeneratedValue
private int id;
@Column(name="data", nullable=true, columnDefinition="BINARY")
@Basic(fetch = FetchType.LAZY)
private byte[] data = new byte[]{};
...
}
When working with the objects (I can potentially have several of those loaded) I often experience the exception below, a Java OutOfMemoryError.
I'm wondering if we're doing anything wrong in handling the object.
Is there a possibility to remove the object, or the byte array, from memory when I'm done with it? Setting it to null doesn't do the magic for me it seems to stay in memory (when observing the memory with 'top' for instance).
I've also set -Xmx to the highest possible value on my 32-bit ยด(Ubuntu) machine (1600m). So increasing the provided memory shouldn't be an option.
Is there any recommended hibernate procedure when working with large data objects? How to release references, tell Hibernate (and/or the JVM) to instantly release the object/memory?
We are using the following:
- JBoss Seam 2.0.2.SP1 on JBoss 4.2.2
- Hibernate 3.2.3.GA, Hibernate Annotations 3.3.0.GA
Any help or hints here are highly appreciated.
Thanks,
Hannes
Code:
Caused by: java.lang.OutOfMemoryError: Java heap space
at org.hibernate.type.AbstractBynaryType.deepCopyNotNull(AbstractBynaryType.java:148)
at org.hibernate.type.MutableType.deepCopy(MutableType.java:25)
at org.hibernate.type.TypeFactory.deepCopy(TypeFactory.java:353)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:181)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:854)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadEntity(Loader.java:1860)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:48)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:42)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3042)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:395)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:375)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:139)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:195)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:103)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:846)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:557)
at org.hibernate.type.EntityType.resolve(EntityType.java:379)
at org.hibernate.type.EntityType.nullSafeGet(EntityType.java:204)
at org.hibernate.persister.collection.AbstractCollectionPersister.readIndex(AbstractCollectionPersister.java:708)
at org.hibernate.collection.PersistentMap.readFrom(PersistentMap.java:258)
at org.hibernate.loader.Loader.readCollectionElement(Loader.java:1008)
at org.hibernate.loader.Loader.readCollectionElements(Loader.java:646)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:591)
at org.hibernate.loader.Loader.doQuery(Loader.java:701)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollection(Loader.java:1994)
at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:36)
at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
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