@Entity
    @Table(name = "Address")
    public class Address implements Serializable
    {
       private static final long serialVersionUID = 1L;
   
       @EmbeddedId
       private AddressPK id = new AddressPK();
   
                   @OneToOne(mappedBy = "address")
       private Insurance_Detail insuranceDetail;
   
    }

    @Embeddable
    public class AddressPK implements Serializable
    {
       // default serial version id, required for serializable classes.
       private static final long serialVersionUID = 1L;
   
       @Column(unique = false, nullable = false, length = 45)
       private String customer_EmailAddress;
   
       @Column(unique = true, nullable = false)
       @GeneratedValue(strategy = GenerationType.IDENTITY)
       private int address_Id;
   
    }

    @Entity
    @Table(name = "Insurance_Detail")
    public class Insurance_Detail implements Serializable
    {
       private static final long serialVersionUID = 1L;
   
       @EmbeddedId
       private AddressPK id;
   
@OneToOne
   @JoinColumns({
           @JoinColumn(name = "address_Id", referencedColumnName = "address_Id", nullable = false, insertable = false, updatable = false),
           @JoinColumn(name = "customer_EmailAddress", referencedColumnName = "customer_EmailAddress", nullable = false, insertable = false, updatable = false) })
   
    }

    Address address= new Address(data1,data2);
   
    address.getId().setCustomer_EmailAddress(
                   currentCustomer.getEmailAddress());
   
    entityManager.persist(address);

    Insurance_Detail insuranceDetail = new Insurance_Detail(address.getId(), data3,data4);
    entityManager.persist(insuranceDetail);

javax.servlet.ServletException: org.springframework.orm.jpa.JpaSystemException: org.hibernate.exception.ConstraintViolationException: Duplicate entry 'test@msn.com' for key 'customer_EmailAddress'; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: Duplicate entry 'test@msn.com' for key 'customer_EmailAddress'
       javax.faces.webapp.FacesServlet.service(FacesServlet.java:606)
       org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
       org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
       org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
       org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
       org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
       org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
       org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
       org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
       org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
       org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
       org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
       org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
       org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
       org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
       org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
       org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
       org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
       org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:183)
       org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
       org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
       org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
       org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
       org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
       org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
       org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
       org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
       org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)