Hi All!
I have build two entities atop existing database.
I have successfully created OneToMany bidirectional mapping.
The mapping is WebModules (one) - WebPage (many)
I can fetch WebModules, display their IDs and iterate through associated
WebPages.
BUT WebPages IDs are set to null.
For example, the below code:
// wef is my SessionBean, it calls WebModule's NamedQuery and returns found
module
WebModule module = wef.findWebModuleByName("Add");
// module id is displayed properly, e.g. 2
response.getWriter().write(
module.getId() + ":" + module.getDescription() + "<br/>");
// iterate through associated WebPages
for (WebPage page : module.getPages()) {
// id is displayed as null
// title is displayed properly
response.getWriter().write("<br/>" + page.getId());
response.getWriter().write("<br/>" + page.getTitle());
}
Of course the pages' ids are not null, they are primary keys with automatically
generated identities.
I don't get it, maybe it's something wrong with my classes?
Here they are:
@Entity
@Table(name="dw_modules",schema="dw")
@NamedQuery (
name = "findWebModuleByName",
query = "SELECT wm FROM WebModule wm WHERE wm.name = :name"
)
public class WebModule implements Serializable {
private Integer id;
private Set<WebPage> pages = new HashSet<WebPage>();
...
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public Integer getId() {
return id;
}
...
}
@Table(name = "dw_pages", schema = "dw")
public class WebPage implements Serializable {
private Integer id;
private WebModule parentModule;
...
...
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public Integer getId() {
return id;
}
...
}
thanks for any hints
best regards
Łukasz
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