I have a property field in a class that is of type javax.xml.datatype.Duration
. It basically represents a time span (e.g. 4 hours and 34 minutes).
JPA is telling me it is an invalid type, which doesn't shock me.
Whats a good solution this? I could implement my own Duration class, but I don't know how to get JPA to "accept" it as a datatype.
Whats a good solution this? I could implement my own Duration class, but I don't know how to get JPA to "accept" it as a datatype.
JPA does not support custom types so if you want to go this way you'll have to use a JPA extension from your provider. For example, Hibernate allows to define custom value types that you declare with @Type
. Obviously, this will harm portability between providers which might be a concern. If not, then you know it is doable.
With standard JPA, the traditional approach would be to add another getter/setter pair which adapt the problematic property and perform conversion when accessed. I would use a Long
to store a duration:
public MyEntity implements Serializable {
private Long id;
private javax.xml.datatype.Duration duration;
@Id
@GeneratedValue
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
@Transient
public Duration getDuration() {
return this.duration;
}
public void setDuration(Duration duration) {
this.duration = duration;
}
public Long getDurationAsJpaCompatibleType() {
return MyXmlUtil.convertDurationToLong(this.duration);
}
public void setDurationAsJpaCompatibleType(Long duration) {
setDuration(MyXmlUtil.convertLongToDuration(duration));
}
}
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