RE: Exception in thread "main" java.lang.StackOverflowError

[CASERO Jaime]

I think your problem is due the recursive nature of the data structure
you are trying to model. Correct if I'm wrong, but "Tabela" is the
classical "Tree". I have already used this kind of structures with
openjpa, and the depth of the tree, is limited by the Java stack.

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 
Sent: Friday, October 05, 2007 3:45 PM
To: users
Subject: Re:Exception in thread "main" java.lang.StackOverflowError

Sorry,

Here the source code.
Please help me.


Teste.java
========================================================================
====
import java.util.Iterator;
import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;

public class Teste {

        /**
         * @param args
         */
        public static void main(String[] args) {
                EntityManagerFactory emf;
                emf = Persistence.createEntityManagerFactory("default",
System
                                .getProperties());
                EntityManager em = (EntityManager)
emf.createEntityManager();
                EntityTransaction transaction = em.getTransaction();

                transaction.begin();
                for (int x = 0; x < 1000; x++) {
                        em.persist(new Tabela(x, "Id " + x));
                }
                transaction.commit();

                
                transaction.begin();
                List l = (List<Tabela>) em.createQuery("SELECT a FROM
Tabela a")
                                .getResultList();
                Iterator i = l.iterator();
                while (i.hasNext()) {
                        Tabela tb = (Tabela) i.next();
                        System.out.println(tb);
                }
                transaction.commit();

        }

}
========================================================================
====


Tabela.java
========================================================================
====

import java.io.Serializable;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;

import org.apache.openjpa.persistence.InverseLogical;

@Entity
public class Tabela implements Serializable {

        private static final long serialVersionUID =
-7323896668494281866L;

        @Id
        private int id;

        private String ds;

        @ManyToOne(cascade = CascadeType.REFRESH)
        @JoinColumn(name = "pai", nullable = true)
        private Tabela pai;

        @OneToMany(cascade = CascadeType.REFRESH, mappedBy = "pai")
        @InverseLogical("pai")
        private List<Tabela> filhos;
        
        public Tabela(int i, String x) {
                id = i;
                ds = x;
        }

        public String getDs() {
                return ds;
        }

        public void setDs(String ds) {
                this.ds = ds;
        }

        public int getId() {
                return id;
        }

        public void setId(int a) {
                this.id = a;
        }

        public Tabela() {
                super();
        }

        public String toString() {
                return "" + id + " " + ds;
        }

        public List<Tabela> getFilhos() {
                return filhos;
        }

        public void setFilhos(List<Tabela> filhos) {
                this.filhos = filhos;
        }

        public Tabela getPai() {
                return pai;
        }

        public void setPai(Tabela pai) {
                this.pai = pai;
        }

}
========================================================================
====


tnks
[]s


---------- In?cio da mensagem original -----------

      De: [EMAIL PROTECTED]
    Para: "users" users@openjpa.apache.org
      Cc: "dev" [EMAIL PROTECTED]
    Data: Tue,  2 Oct 2007 20:28:44 -0300
 Assunto: Exception in thread "main" java.lang.StackOverflowError

> Guys,
> 
> I do a simple teste and I found that error:
> Exception in thread "main" java.lang.StackOverflowError
>       at java.security.AccessController.doPrivileged(Native Method)
>       at
org.apache.openjpa.enhance.Reflection.getDeclaredField(Reflection.java:1
66)
> :
> :
> 
> The error occurrs in the last commit "transaction.commit();" at line
36.
> 
> 
> 
>
 
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