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Hibernate & Struts 2 - Many-to-One issue

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Tazman

Post subject: Hibernate & Struts 2 - Many-to-One issue

Posted: Tue Mar 20, 2007 12:51 pm

Newbie

Joined: Tue Mar 20, 2007 12:35 pm
Posts: 4

Hi,

I'm working with Struts 2 and Hibernate 3for about two weeks and it's my first experience with both. I'm having difficulty with 1:n relations.

I've got two tables: Company and Person.
Company has an owner, which is a reference to a specific Person.
I've implemented the mapping like this in Company.hbm.xml:

Code:

<many-to-one column="OWNER_ID" name="owner" class="model.person.Person"/>

The Company class has a getter and setter:

Code:

private Long id;
public Long getId() {return id;}
public void setId(Long id) {this.id = id;}

The CompanyAction class used by Struts has:

Code:

private List persons;
private static PersonService personService = new PersonServiceHibernate();

public void prepare() throws Exception {
persons = personService.getAllPersons();
...
}

And the Company.jsp (which uses Struts 2) has:

Code:

<s:select label="%{getText('company.label.owner')}" name="company.owner" list="persons" listKey="id" listValue="firstName" emptyOption="true"/>

The JSP creates a nice choice-box (I would rather have an LOV pop-up with some search functionality, but that's for later). I can select the correct Person by name and the value is also present (checked in the html).

However, when I submit the form, I get the following error:

Code:

javax.servlet.ServletException: org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of model.person.Person.id
   org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:518)
   org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:421)

root cause

org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of model.person.Person.id
   org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:171)
   org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:183)
   org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:3585)

etc.

If I submit without filling in an owner, all works fine. I guess, when any one of my companies has an owner, the error occurs. Can anyone help me out?

Tnx in advance

Code:

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Tazman

Post subject:

Posted: Tue Mar 20, 2007 12:54 pm

Newbie

Joined: Tue Mar 20, 2007 12:35 pm
Posts: 4

The record is not committed to the database, so my guess is wrong.
The error appears to occur, before any database transactions are made.

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Tazman

Post subject:

Posted: Tue Mar 20, 2007 1:03 pm

Newbie

Joined: Tue Mar 20, 2007 12:35 pm
Posts: 4

I've logged some info on the record to be saved in the CompanyServiceHibernate class:

Code:

public void insertCompany(Company company) {
  System.out.println("Company:");
  System.out.println("Name: " + company.getName());
  System.out.println("Owner: " + company.getOwner());
  System.out.println("Id: " + company.getId());
  Session session = HibernateUtil.getSessionFactory().getCurrentSession();
  session.beginTransaction();
  session.save(company);
  session.getTransaction().commit();
}


Hibernate: select person0_.ID as ID0_, pers
0_.lastName as lastName0_, person0_.usernam
as COMPANY5_0_ from PERSON person0_
Company:
Name: Some other company
Owner: 1
Id: null
Hibernate: select max(ID) from COMPANY

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