Constraint Violation when persisting One To Many relation

Question

In a spring mvc application using hibernate and MySQL, I am getting the following constraint violation exception:

Caused by: com.mysql.jdbc.exceptions.jdbc         


        

Answer 1

Change this:

@OneToMany(mappedBy = "providertype")
private Set documententities;

To this:

@OneToMany(fetch = FetchType.LAZY)
@JoinTable(name = "Link_Documents", joinColumns = {@JoinColumn(name = "codePk", unique = true)}, inverseJoinColumns = {@JoinColumn(name = "change_this_with_primary_key_variable_name_from_HL7DocumentEntity")})
 private Set documententities;

And in HL7DocumentEntity change as follows:

This

@ManyToOne
    @JoinColumns({ @JoinColumn(name = "ptcode", referencedColumnName = "code"),
        @JoinColumn(name = "ptcodesystem", referencedColumnName = "codesystem")
    })
    private HL7GeneralCode providertype;

Change to this:

@ManyToOne(fetch = FetchType.LAZY)
  @JoinTable(name = "Link_Documents", joinColumns = {@JoinColumn(name = "change_this_with_primary_key_variable_name_from_HL7DocumentEntity")}, inverseJoinColumns = {@JoinColumn(name = "codePk")})
  private HL7GeneralCode providertype;

I think you have to change "change_this_with_primary_key_variable_name_from_HL7DocumentEntity" with "id" like it is in BaseEntity but take a look at your sql table, you willsee there the correct name.

I hope you notice How I told JPA to use the same "Link_Documents" table for linking the 2 tables. I think this is were your mistake is. Just make sure to change where I told you with the correct variable name and I think it should work