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long[] studentIds = 。。。
List<Student> list = new ArrayList<Student>();
for(long id : studentIds){
list.add(em.find(Student.class,id);
}
teacher.setStudents(list);
@ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
@JoinTable(name = "T_POST_ATTACHMENT", joinColumns = @JoinColumn(name = "POST_ID", referencedColumnName = "ID"), inverseJoinColumns = @JoinColumn(name = "ATTACHMENT_ID", referencedColumnName = "ID"))
private List<Attachment> attachments;