Question

I have an entity called ProdTransaction. I am saving two records of type ProdTransaction. Both the two inserts succeed when run independently. I mean

tranDAO.save(record1) //alone works
tranDAO.save(record2) //alone works

but together running them as

tranDAO.save(record1)
tranDAO.save(record2)

HSQL throws a GenericJDBCException error.

@Entity
@Table(name = "ProdTransaction")
public class ProdTransactionextends PersistentObject implements Serializable {
private static final long serialVersionUID = 1L;

@Embedded
private ProdTranPK id;

@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE)
@Column(name = "REC_ID")
private Long recId;

@Temporal(TemporalType.DATE)
private Date date1;

@Column(length = 1)
private String comment;
}

I have verified the data and it’s all fine. When I run against HSQL I get:

GenericJDBCException: could not execute JDBC batch update.

But if I connect to my physical DB, and run with the same sequence, it works fine. What could be the problem in HSQL? I am using version 1.8.

Answer 1

HSQLDB batching bug was fixed, now it works ok. Problem is that if you have an error, such as a problem with your SQL statement etc, you’ll only get a generic exception that doesn’t really tell you anything. What I like to do is have a helper class that can execute SQL queries in batch mode and individually, and I switch to individual queries when I get weird errors from batch mode. Try that, maybe it’s just a simple mistake in your SQL