Org.eclipse.persistence.exceptions.ConversionException with INTERVALSD

Question

I have this issue with eclipselink 1.2.0.v20091016-r5565 and Oracle 11gR2
column is INTERVAL DAY(5) TO SECOND(1) in database
in EJB has been generated as Integer
any workaround ???
thank u
patrick
[EL Warning]: Exception [EclipseLink-3002] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [0 0:0:2.400000000], of class [class oracle.sql.INTERVALDS], from mapping [org.eclipse.persistence.mappings.DirectToFieldMapping[flushElapsed-->sys.WRM$_SNAPSHOT.FLUSH_ELAPSED]] with descriptor [RelationalDescriptor(org.eclipse.persistence.extension.dynamic.WrmSnapshot --> [DatabaseTable(sys.WRM$_SNAPSHOT)])], could not be converted to [class java.lang.Integer].
Exception in thread "main" Local Exception Stack:
Exception [EclipseLink-3002] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [0 0:0:2.400000000], of class [class oracle.sql.INTERVALDS], from mapping [org.eclipse.persistence.mappings.DirectToFieldMapping[flushElapsed-->sys.WRM$_SNAPSHOT.FLUSH_ELAPSED]] with descriptor [RelationalDescriptor(org.eclipse.persistence.extension.dynamic.WrmSnapshot --> [DatabaseTable(sys.WRM$_SNAPSHOT)])], could not be converted to [class java.lang.Integer].
at org.eclipse.persistence.exceptions.ConversionException.couldNotBeConverted(ConversionException.java:71)
at org.eclipse.persistence.internal.helper.ConversionManager.convertObjectToInteger(ConversionManager.java:539
package org.eclipse.persistence.extension.dynamic;
import java.io.Serializable;
import java.sql.Timestamp;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.IdClass;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
@Entity
@NamedQueries({
@NamedQuery(name = "WrmSnapshot.findAll", query = "select o from WrmSnapshot o")
@Table(name = "WRM$_SNAPSHOT")
@IdClass(WrmSnapshotPK.class)
public class WrmSnapshot implements Serializable {
@Column(name="BEGIN_INTERVAL_TIME", nullable = false)
private Timestamp beginIntervalTime;
@Column(name="BL_MOVED")
private Long blMoved;
@Id
@Column(nullable = false)
private Long dbid;
@Column(name="END_INTERVAL_TIME", nullable = false)
private Timestamp endIntervalTime;
@Column(name="ERROR_COUNT")
private Long errorCount;
@Column(name="FLUSH_ELAPSED")
private Integer flushElapsed;
@Id
@Column(name="INSTANCE_NUMBER", nullable = false)
private Long instanceNumber;
@Column(name="SNAP_FLAG")
private Long snapFlag;
@Id
@Column(name="SNAP_ID", nullable = false)
private Long snapId;
@Column(name="SNAP_LEVEL")

Answer 1

It probably depends on which tool are you using to generate EJB's from tables, but i don't think it's possible to make it use String for INTERVAL fields.
I don't have much experience with working with INTERVAL fields but my guess is that they are converted to Lob's instead of byte array (Lob actually make sense as a representation of byte array). My other guess is that if you choose String for your field then when read from DB it is first converted to Lob then to String, but proper mapping for INTERVAL field is Lob. Number field can be converted to String but its not a "proper" way to handle Number fields.