Hello,
I am a newbie trying to use Hibernate and JPA for developing my graduating thesis.
I have a DocumentFolder entity that I want to update, but when I try to do it I receive a stackoverflow exception. the entities involved are as below:
Code:
@Entity
@Table(name = "Document_Folder")
public class DocumentFolder
{
@ManyToOne
private UserAccount moderator;
@OneToMany(mappedBy="pk.documentFolder", cascade = {CascadeType.ALL}/*, fetch = FetchType.EAGER*/)
private List<ParamDocumentFolder> paramDocumentFolder ;
//getters and setters here
}
@Entity
public class ParamDocumentFolder
{
@EmbeddedId
ParamDocumentFolderPK pk = new ParamDocumentFolderPK();
@Column(name = "Value")
private String value;
@Transient
public DocumentFolder getDocumentFolder()
{
return pk.getDocumentFolder();
}
public void setDocumentFolder(DocumentFolder documentFolder)
{
pk.setDocumentFolder(documentFolder);
}
@Transient
public Params getParam()
{
return pk.getParam();
}
public void setParam(Params param)
{
pk.setParam(param);
}
//getters and setters here
}
@Embeddable
public class ParamDocumentFolderPK implements Serializable
{
@ManyToOne
@JoinColumn(name="idDocumentFolder")
private DocumentFolder documentFolder;
@ManyToOne()
@JoinColumn(name="idParam")
private Params param;
@Override
public int hashCode()
{
final int prime = 31;
int result = 1;
result = prime * result
+ ((documentFolder == null) ? 0 : documentFolder.hashCode());
result = prime * result + ((param == null) ? 0 : param.hashCode());
return result;
}
@Override
public boolean equals(Object obj)
{
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
ParamDocumentFolderPK other = (ParamDocumentFolderPK) obj;
if (documentFolder == null)
{
if (other.documentFolder != null)
return false;
}
else if (!documentFolder.equals(other.documentFolder))
return false;
if (param == null)
{
if (other.param != null)
return false;
}
else if (!param.equals(other.param))
return false;
return true;
}
//getters and setters
}
I have been able to insert documentFolder entities and also to retrieve a document folder entity from the database using a query like this:
Code:
this.em.createQuery("select folder from DocumentFolder folder left join fetch folder.paramDocumentFolder where id = :id").setParameter("id", id).getSingleResult();
But, when I try to update an entity, using a code like:
Code:
this.em.merge(documentFolder);
I get a stack overflow exception. Can you help me find the problem?
I am using hibernate as JPA implementation inside JBOSS 5.1.0.
The stack trace from JBOSS is:
Code:
2010-06-11 20:41:41,020 INFO [STDOUT] (http-127.0.0.1-8080-3) Hibernate: select documentfo0_.id as id132_1_, documentfo0_.moderator_id as moderator3_132_1_, documentfo0_.Name as Name132_1_, paramdocum1_.idDocumentFolder as idDocume3_3_, paramdocum1_.idParam as idParam3_, paramdocum1_.idDocumentFolder as idDocume3_141_0_, paramdocum1_.idParam as idParam141_0_, paramdocum1_.Value as Value141_0_ from Document_Folder documentfo0_ left outer join ParamDocumentFolder paramdocum1_ on documentfo0_.id=paramdocum1_.idDocumentFolder where documentfo0_.id=?
2010-06-11 20:41:41,528 ERROR [org.jboss.aspects.tx.TxPolicy] (http-127.0.0.1-8080-3) javax.ejb.EJBTransactionRolledbackException: Unexpected Error
java.lang.StackOverflowError
at sun.nio.cs.MS1252$Decoder.<init>(MS1252.java:72)
at sun.nio.cs.MS1252.newDecoder(MS1252.java:39)
at java.nio.charset.CharsetEncoder.isLegalReplacement(CharsetEncoder.java:311)
at java.nio.charset.CharsetEncoder.replaceWith(CharsetEncoder.java:267)
at java.nio.charset.CharsetEncoder.<init>(CharsetEncoder.java:186)
at java.nio.charset.CharsetEncoder.<init>(CharsetEncoder.java:209)
at sun.nio.cs.SingleByteEncoder.<init>(SingleByteEncoder.java:39)
at sun.nio.cs.MS1252$Encoder.<init>(MS1252.java:115)
at sun.nio.cs.MS1252.newEncoder(MS1252.java:43)
at java.lang.StringCoding$StringEncoder.<init>(StringCoding.java:215)
at java.lang.StringCoding$StringEncoder.<init>(StringCoding.java:207)
at java.lang.StringCoding.encode(StringCoding.java:266)
at java.lang.StringCoding.encode(StringCoding.java:284)
at java.lang.String.getBytes(String.java:986)
at org.jboss.logging.util.LoggerStream.println(LoggerStream.java:96)
at org.hibernate.jdbc.util.SQLStatementLogger.logStatement(SQLStatementLogger.java:113)
at org.hibernate.jdbc.AbstractBatcher.log(AbstractBatcher.java:444)
at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:511)
at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:452)
at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:161)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1573)
at org.hibernate.loader.Loader.doQuery(Loader.java:696)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
at org.hibernate.loader.Loader.loadEntity(Loader.java:1881)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:71)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:65)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3072)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:434)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:415)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:165)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:223)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:126)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:905)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:873)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:590)
at org.hibernate.type.EntityType.resolve(EntityType.java:412)
at org.hibernate.type.ComponentType.resolve(ComponentType.java:607)
at org.hibernate.type.ComponentType.nullSafeGet(ComponentType.java:298)
at org.hibernate.loader.Loader.getKeyFromResultSet(Loader.java:1121)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:588)
at org.hibernate.loader.Loader.doQuery(Loader.java:724)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
at org.hibernate.loader.Loader.loadEntity(Loader.java:1881)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:71)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:65)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3072)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:434)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:415)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:165)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:223)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:126)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:905)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:873)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:590)
at org.hibernate.type.EntityType.resolve(EntityType.java:412)
at org.hibernate.type.ComponentType.resolve(ComponentType.java:607)
at org.hibernate.type.ComponentType.nullSafeGet(ComponentType.java:298)
at org.hibernate.loader.Loader.getKeyFromResultSet(Loader.java:1121)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:588)
at org.hibernate.loader.Loader.doQuery(Loader.java:724)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
at org.hibernate.loader.Loader.loadEntity(Loader.java:1881)
Thanks.
Login
FAQ
Search