Hibernate 1.0 + JPA + Netbeans 7.01 + Sql server 2005 = Problems to insert into table with GenerationType.IDENTITY

My environment:

Hibernate 1.0 JPA Netbeans 7.01 Sql server 2005

Part of code:

public class EdiAgendamentoCliente implements Serializable {
private static final long 开发者_StackOverflowserialVersionUID = 1L;
@Id
@GeneratedValue (strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "id_edi", unique = true, nullable = true)
private Integer idEdi;

Error:

"java.lang.IllegalArgumentException: id to load is required for loading"

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Im trying to insert values into a table with auto increment, but its not working, can you guys give me some direction here?

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Change it to nullable false, and check column name in database matches the name attribute

@Column(name = "id_edi", unique = true, nullable = false)