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hibernate.PropertyAccessException: Could not set field value [410] value by reflection

 
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Hello,
I work with the website “openfights.org” I import my data.
I have a persistence “MyApp”, 4 classes: Aireline, Airport, Route and RouteId. I use H2 as a database. I have an ImportData class to import my data from the openfights.org site.
When importing Aireline and Airport data are well filled.
the problem is that for the class Route I had to do a RouteId class because I have several primary keys.
Hibernate raises an exception.

Route class



RouteId class



here is my method of importing Routes



Hibernate Debug :

Hibernate: insert into Airline (active, alias, callsign, country, iata, icao, name, airlineId) values (?, ?, ?, ?, ?, ?, ?, ?)
Hibernate: insert into Airline (active, alias, callsign, country, iata, icao, name, airlineId) values (?, ?, ?, ?, ?, ?, ?, ?)
Hibernate: insert into Airline (active, alias, callsign, country, iata, icao, name, airlineId) values (?, ?, ?, ?, ?, ?, ?, ?)
DEBUG (ImportData.java) - Stream opened to [https://raw.githubusercontent.com/jpatokal/openflights/master/data/routes.dat]
Exception in thread "main" javax.persistence.PersistenceException: org.hibernate.PropertyAccessException: Could not set field value [410] value by reflection : [class flights.RouteId.airlineId] setter of flights.RouteId.airlineId
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:147)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:155)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:162)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:787)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:765)
at ImportData.importFromSource(ImportData.java:199)
at ImportData.main(ImportData.java:230)
Caused by: org.hibernate.PropertyAccessException: Could not set field value [410] value by reflection : [class flights.RouteId.airlineId] setter of flights.RouteId.airlineId
at org.hibernate.property.access.spi.SetterFieldImpl.set(SetterFieldImpl.java:58)
at org.hibernate.mapping.Component$ValueGenerationPlan.execute(Component.java:419)
at org.hibernate.id.CompositeNestedGeneratedValueGenerator.generate(CompositeNestedGeneratedValueGenerator.java:97)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:105)
at org.hibernate.jpa.event.internal.core.JpaPersistEventListener.saveWithGeneratedId(JpaPersistEventListener.java:67)
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:189)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:132)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:58)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:780)
... 3 more
Caused by: java.lang.NullPointerException
at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:57)
at sun.reflect.UnsafeIntegerFieldAccessorImpl.set(UnsafeIntegerFieldAccessorImpl.java:75)
at java.lang.reflect.Field.set(Field.java:764)
at org.hibernate.property.access.spi.SetterFieldImpl.set(SetterFieldImpl.java:38)
... 11 more

 
Philippe Ponceblanc
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When Route is new, its RouteId id has never been initialized.

How do you see the coding to initialize the RouteId?
what should you do?
 
Philippe Ponceblanc
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it misses this code


to initialize RouteId
but I do not know where to put it?
 
Greenhorn
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Try to set RouteId in Route:
Add constructor in RouteId: public RouteId(int airlineId, int sourceId, int destinationId) {
      //....
   }
And set RouteId in Route:
Route route = new Route();
// you code
route.setId(new RouteId(airlineId, sourceId, destinationId));
return route;
 
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