Question

My TableX has reference to TableY.

@JoinColumn(name = "idTableY", referencedColumnName = "idTableY")
@ManyToOne(optional = false, fetch=FetchType.LAZY)
private TableY idTableY; 

and I get this error.

<openjpa-2.0.0-r422266:935683 fatal user error> org.apache.openjpa.persistence.ArgumentException 
"com.mycompany.entities.TableX.idTableY" has columns with targets, but OpenJPA does not support any joins on this mapping in this context.

Table Y has this code:

 @OneToMany(cascade = CascadeType.ALL, mappedBy = "idTableY")
    private Collection<TableX> tableXCollection;

This generated eclipse-link code is 100% normal ( all other entities/tables with similar code have no problems).

But a couple of these are giving such errors. Any idea why?

Answer 1

Try to remove the @JoinColumn definition it is unnecessary. The join column containing foreign key is generated automatically. Entity is not a table those are two different things. Entity is class mapped on db table(s).