Hi all,
I have this table in MySQL database:

PK id  Int
 nome Varchar

I tryied two ways of coding:
 1 - with the PrimaryKey class so made
  public class KeyTestPK implements java.io.Serializable
  {
   public Integer id;

   public KeyTestPK(Integer id)
   {
    this.id = id;
   }
   public KeyTestPK(){ }

   public int hashCode()
   {
    return (id).hashCode();
   }
   public boolean equals(Object obj)
   {
    if (this.getClass().equals(obj.getClass()))
    {
          KeyTestPK that = (KeyTestPK) obj;
          return this.id.equals(that.id);
       }
       return false;
   }
  }

  I tryed also the same class with the toString method and getter and setter
for id field.

 2 - without the above class

I obtained that the case 2 does function well, while in the case 1 there is
some problem.
In detail this message is presented in the JBoss console when I try to
execute the getNome method of the entity
 [09:33:15,989,CMP] Didn't read ahead field 'nome'
The method returns the value I requested correctly.
This situation became a problem when I try to do the same thing for a table
with more than 2 columns in PK:
the transaction is corrupted and this message is presented
 Read ahead failed
followed by a lot of other messages ...

How to avoid this behaviour?
maybe the PrimaryKey class I had wrote is wrong?
how can I disable the read-ahead feature?
maybe there is something to set in the jbosscmp-jdbc.xml or in the
ejb-jar.xml file???

can anyone help me, please?

Using: JBoss3.0alpha JDK1.4 EJB2.0 MySQL4.0.0-alpha-max-nt(INNODB type
tables)




thanks