java - Hibernate @OneToOne @NotNull -

is valid declare @onetoone , @notnull on both sides of relationship, such as:

class changeentry {     @onetoone(cascade=cascadetype.all)     @notnull     changeentrydetails changeentrydetails;      public void adddetails(changeentrydetails details) {        this.changeentrydetails = details;        details.setchangeentry(this);     }  }   class changeentrydetails  {      @onetoone(cascase=cascadetype.all)      @notnull      changeentry changeentry;       public void setchangeentry(changeentry changeentry)      {           this.changeentry = changeentry;      }  } 

i can't find says invalid, seems during persistence @ least 1 side of relationship must violated. (eg., if writing changeentry first, changeentrydetails null temporarily).

when trying this, see exception thrown not-null property references null or transient value.

i'd avoid relaxing constraint if possible, because both sides must present.

is valid declare @onetoone , @notnull on both sides of relationship (...) can't find says invalid, seems during persistence @ least 1 side of relationship must violated. (e.g. if writing changeentry first, changeentrydetails null temporarily).

it valid , works fine mapped entities. need declare 1 side of bi-directional association "owning" side (this "control" order of inserts). 1 possible working solution:

@entity @namedqueries( { @namedquery(name = changeentry.find_all_changeentries, query = "select c changeentry c") }) public class changeentry implements serializable {     public final static string find_all_changeentries = "findallchangeentries";      @id     @generatedvalue     private long id;      @onetoone(optional = false, cascade = cascadetype.all)     @joincolumn(name = "details_id", unique = true, nullable = false)     @notnull     private changeentrydetails changeentrydetails;      public void adddetails(changeentrydetails details) {         this.changeentrydetails = details;         details.setchangeentry(this);     }      // constructor, getters , setters } 

and other entity (note mappedby attribute set on non-owning side of association):

@entity public class changeentrydetails implements serializable {     @id     @generatedvalue     private long id;      @onetoone(optional = false, mappedby = "changeentrydetails")     @notnull     private changeentry changeentry;      // constructor, getters , setters } 

with these entities, following test (for demonstration purposes) passes:

public class changeentrytest {     private static entitymanagerfactory emf;         private entitymanager em;      @beforeclass     public static void createentitymanagerfactory() {         emf = persistence.createentitymanagerfactory("testpu");     }         @afterclass     public static void closeentitymanagerfactory() {         emf.close();     }         @before     public void begintransaction() {         em = emf.createentitymanager();         em.gettransaction().begin();     }         @after     public void rollbacktransaction() {            if (em.gettransaction().isactive()) {             em.gettransaction().rollback();         }         if (em.isopen()) {             em.close();         }     }      @test      public void testcreateentrywithoutdetails() {         try {             changeentry entry = new changeentry();             em.persist(entry);             fail("expected constraintviolationexception wasn't thrown.");         } catch (constraintviolationexception e) {             assertequals(1, e.getconstraintviolations().size());             constraintviolation<?> violation = e.getconstraintviolations()                 .iterator().next();              assertequals("changeentrydetails", violation.getpropertypath()                 .tostring());             assertequals(notnull.class, violation.getconstraintdescriptor()                 .getannotation().annotationtype());         }     }      @test     public void testcreatedetailswithoutentry() {             try {             changeentrydetails details = new changeentrydetails();             em.persist(details);             fail("expected constraintviolationexception wasn't thrown.");         } catch (constraintviolationexception e) {             assertequals(1, e.getconstraintviolations().size());             constraintviolation<?> violation = e.getconstraintviolations()                 .iterator().next();              assertequals("changeentry", violation.getpropertypath()                 .tostring());             assertequals(notnull.class, violation.getconstraintdescriptor()                 .getannotation().annotationtype());         }     }      @test     public void validentrywithdetails() {         changeentry entry = new changeentry();         changeentrydetails details = new changeentrydetails();         entry.adddetails(details);         em.persist(entry);          query query = em.createnamedquery(changeentry.find_all_changeentries);         assertequals(1, query.getresultlist().size());     } }