我在类似的情况下找到了正确的映射（并在广泛的情况下使用JUnit进行了测试）。我认为我不会发布测试代码，因为适应该示例会花费很长时间。无论如何，关键是：
以OP为例
@ManyToMany(fetch = FetchType.LAZY,
cascade =
{
CascadeType.DETACH,
CascadeType.MERGE,
CascadeType.REFRESH,
CascadeType.PERSIST
},
targetEntity = Course.class)
@JoinTable(name = "XTB_STUDENTS_COURSES",
inverseJoinColumns = @JoinColumn(name = "COURSE_ID",
nullable = false,
updatable = false),
joinColumns = @JoinColumn(name = "STUDENT_ID",
nullable = false,
updatable = false),
foreignKey = @ForeignKey(ConstraintMode.CONSTRAINT),
inverseForeignKey = @ForeignKey(ConstraintMode.CONSTRAINT))
private final Set<Course> courses = new HashSet<>();
@ManyToMany(fetch = FetchType.LAZY,
cascade =
{
CascadeType.DETACH,
CascadeType.MERGE,
CascadeType.REFRESH,
CascadeType.PERSIST
},
targetEntity = Student.class)
@JoinTable(name = "XTB_STUDENTS_COURSES",
joinColumns = @JoinColumn(name = "COURSE_ID",
nullable = false,
updatable = false),
inverseJoinColumns = @JoinColumn(name = "STUDENT_ID",
nullable = false,
updatable = false),
foreignKey = @ForeignKey(ConstraintMode.CONSTRAINT),
inverseForeignKey = @ForeignKey(ConstraintMode.CONSTRAINT))
private final Set<Student> students = new HashSet<>();
广泛的JUnit测试证明：
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