Hello,
I have a Spring application which uses Hibernate on a PostgreSQL database. I'm trying to store files in a table of the database. It seems it stores the row with the file (I just use persist method on EntityManager), but when the object is loaded from the database I get the following exception:
org.postgresql.util.PSQLException: Large Objects may not be used in auto-commit mode.
To load the data I'm using a MultipartFile transient atribute and in its setter I'm setting the information I want to persist (byte[], fileName, size). The entity I'm persisting looks like this one (I've ommitted the rest of getters/setters):
@Entity
@Table(name="myobjects")
public class MyClass {
@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="sequence")
@SequenceGenerator(name="sequence", sequenceName="myobjects_pk_seq", allocationSize=1)
@Column(name="id")
private Integer id;
@Lob
private String description;
@Temporal(TemporalType.TIMESTAMP)
private Date creationDate;
@Transient
private MultipartFile multipartFile;
@Lob
@Basic(fetch=FetchType.LAZY, optional=true)
byte[] file;
String fileName;
String fileContentType;
Integer fileSize;
public void setMultipartFile(MultipartFile multipartFile) {
this.multipartFile = multipartFile;
try {
this.file = this.multipartFile.getBytes();
this.fileName = this.multipartFile.getOriginalFilename();
this.fileContentType = this.multipartFile.getContentType();
this.fileSize = ((Long) this.multipartFile.getSize()).intValue();
} catch (IOException e) {
logger.error(e.getStackTrace());
}
}
}
I can see that when it is persisted I have the data in the row but when I call this method it fails:
public List<MyClass> findByDescription(String text) {
Query query = getEntityManager().createQuery("from MyClass WHERE UPPER(description) like :query ORDER BY creationDate DESC");
query.setParameter("query", "%" + text.toUpperCase() + "%");
return query.getResultList();
}
This method only fails when the result has objects with files. I've tried to set in my persistence.xml
<property name="hibernate.connection.autocommit" value="false" />
but it doesn't solve the problem.
In general the application works well it only commit the data when the transaction is finished and it performs a rollback if something fails, so I don't understand why is this happening.
Any idea?
Thanks.
UPDATE
Looking at the link given by Shekhar it is suggested to include the call in a transation, so I've set the service call inside a transaction an it works (I've added @Transactional annotation).
@Transactional
public List<myClass> find(String text) {
return myClassDAO.findByDescription(text);
}
the problem is that I don't want to persist any data so I don't understand why it should be include inside a transaction. Does it make any sense to make a commit when I've only loaded some data form the database?
Thanks.