Despite all of the others post, I can&#39;t find a solution for this error with GlassFish, on MacOSX, NetBeans 7.2.

    Here the error :
    SEVERE: Exception while invoking class org.glassfish.persistence.jpa.JPADeployer
    prepare method
    SEVERE: Exception while preparing the app
    SEVERE: [PersistenceUnit: supmarket] Unable to build EntityManagerFactory
    
    ...
    
    Caused by: org.hibernate.MappingException: Repeated column in mapping for entity:
    com.supmarket.entity.Sale column: customerId
    (should be mapped with insert=&quot;false&quot; update=&quot;false&quot;)

Here the code :

**Sale.java**

    @Entity
    public class Sale {
        
        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        private Long id;
        
        @Column(nullable=false)
        private Long idFromAgency;
        
        private float amountSold;
        
        private String agency;
        
        @Temporal(javax.persistence.TemporalType.DATE)
        private Date createdate;
        
        @Column(nullable=false)
        private Long productId;
        
        @Column(nullable=false)
        private Long customerId;
        
        @ManyToOne(optional=false)
        @JoinColumn(name=&quot;productId&quot;,referencedColumnName=&quot;id_product&quot;)
        private Product product;
        
        @ManyToOne(optional=false)
        @JoinColumn(name=&quot;customerId&quot;,referencedColumnName=&quot;id_customer&quot;)
        private Customer customer;
        
        
        public void Sale(){}    
        public void Sale(Long idFromAgency, float amountSold, String agency
                , Date createDate, Long productId, Long customerId){        
            ...
        }
    
        // then getters/setters
    }

**Customer.java**

    @Entity
    public class Customer {
        
        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        @Column(name=&quot;id_customer&quot;)
        private Long id_customer;
        
        @Column(nullable=false)
        private Long idFromAgency;
        
        private String  gender,
                        maritalState,
                        firstname,
                        lastname,
                        incomeLevel;
        
        @OneToMany(mappedBy=&quot;customer&quot;,targetEntity=Sale.class, fetch=FetchType.EAGER)
        private Collection sales;
        
           
        public void Customer(){}
        
        public void Customer(Long idFromAgency, String gender, String maritalState,
                String firstname, String lastname, String incomeLevel) {
            ...
        }
    
    }

**Product.java**

    public class Product {
        
        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        @Column(name=&quot;id_product&quot;)
        private Long id_product;
        
        @Column(nullable=false)
        private Long idFromAgency;
        
        private String name;
        
        @OneToMany(mappedBy=&quot;product&quot;,targetEntity=Sale.class, fetch=FetchType.EAGER)
        private Collection sales;
    
        //constructors + getters +setters
    }

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Another Repeated column in mapping for entity error