org.springframework.orm.jpa.JpaSystemException: Could not find a getter for null in class com.albaraka.srs.forex.domain.Customer; nested exception is org.hibernate.PropertyNotFoundException: Could not find a getter for null in class com.albaraka.srs.forex.domain.Customer
	at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:310)
	at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:221)
	at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:521)

	@Override
	public boolean mapToMapFromEntity(
			SessionImplementor session,
			Map<String, Object> data,
			Object newObj,
			Object oldObj) {
		boolean ret = false;
		for ( PropertyData propertyData : properties.keySet() ) {
			Getter getter;
			if ( newObj != null ) {
				getter = ReflectionTools.getGetter( newObj.getClass(), propertyData, session.getFactory().getServiceRegistry() );
			}
			else if ( oldObj != null ) {
				getter = ReflectionTools.getGetter( oldObj.getClass(), propertyData, session.getFactory().getServiceRegistry() );
			}
			else {
				return false;
			}

			ret |= properties.get( propertyData ).mapToMapFromEntity(
					session, data,
					newObj == null ? null : getter.get( newObj ),
					oldObj == null ? null : getter.get( oldObj )
			);
		}

		return ret;
	}

				getter = ReflectionTools.getGetter( newObj.getClass(), propertyData, session.getFactory().getServiceRegistry() );
			}

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.validation.constraints.Size;

import org.hibernate.annotations.NaturalId;
import org.hibernate.envers.Audited;
import org.hibernate.validator.constraints.Length;

import com.sun.istack.internal.NotNull;

import lombok.Data;

@Data
@Entity
@Audited
public class Customer implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    @NaturalId
    @NotNull
    @Length(min = 6, max = 6)
    private String customerNumber;

    @Audited
    @OneToMany(mappedBy = "customer")
    private Collection<Account> accounts = new ArrayList();

    @Size(max = 10, message = "{Size.customer.devices}")
    @OneToMany(mappedBy = "customer", cascade = CascadeType.ALL)
    private Set<Device> devices = new HashSet();

}

import javax.persistence.Entity;
import javax.persistence.ForeignKey;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.validation.constraints.NotNull;

import org.hibernate.envers.Audited;

import lombok.Data;

@Data
@Entity
@Audited
public class Account {


    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Audited
    @ManyToOne
    @JoinColumn(
            name = "customer_customernumber",
            referencedColumnName = "customerNumber",
            columnDefinition = "VARCHAR(6)",
            foreignKey = @ForeignKey(name = "fk_acc_cust_custnumber")

    )
    @NotNull
    private Customer customer;

}

import javax.persistence.Entity;
import javax.persistence.ForeignKey;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;

import org.hibernate.envers.Audited;

import lombok.Data;

@Data
@Entity
@Audited
public class Device {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Audited
    @ManyToOne
    @JoinColumn(name = "customer_id",
            foreignKey = @ForeignKey(name = "fk_dev_cust_id")
    )
    private Customer customer;

}

        Customer customer = new Customer();
        customer.setCustomerNumber("123457");
        entityManager.getTransaction().begin();
        entityManager.persist(customer);
        entityManager.getTransaction().commit();

        Device device = new Device();
        device.setCustomer(customer);

        Account account = new Account();
        account.setCustomer(customer);
        entityManager.getTransaction().begin();
        entityManager.persist(account);
        entityManager.getTransaction().commit();
        entityManager.getTransaction().begin();
        entityManager.remove(account);
        entityManager.getTransaction().commit();

propertyData = {PropertyData@6977} 
name = {String@6983} "_co_fingerprintsoft_spring_hibernate_audit_Account_customer"
beanName = null
accessType = {String@6984} "property"
store = {ModificationStore@6908} "FULL"
usingModifiedFlag = false
modifiedFlagName = {String@6985} "customerNumber_MOD"