I have this situation:
@Entity
@Table(name = "project_leader")
public class ProjectLeader {
@ManyToOne
@JoinColumn(name = "projectId")
@JsonBackReference(value = "project")
private Project project;
...
and related entity
@Entity
@Table(name = "project")
public class Project {
@OneToMany(fetch = FetchType.EAGER, mappedBy = "project", orphanRemoval = true)
@Cascade(CascadeType.ALL)
@JsonManagedReference(value = "project")
private Set<ProjectLeader> projectLeaders = new HashSet<ProjectLeader>();
In situation for example
Project_A with ProjectLeader_1 and Project_B with ProjectLeader_2
and when I try to add ProjectLeader_1 to Project_B also I get ProjectLeader_1 completely moved from Project_A to Project_B, so I have a following situation:
Project_A with -No leader- and Project_B with ProjectLeader_2 ProjectLeader_1
The desirable result should be:
Project_A with ProjectLeader_1 and Project_B with ProjectLeader_2 ProjectLeader_1
Here is the method used for assigning leaders to project:
private Project initializeProject(@Nonnull ProjectDto projectDto) {
Project project = null;
if (projectDto.getId() != null) {
project = projectRepository.findOne(projectDto.getId());
} else {
project = new Project();
}
project.setName(projectDto.getName());
project.setProjectType(projectDto.getProjectType());
project.setFinancedBy(projectDto.getFinancedBy());
Set<ProjectLeader> projectLeaders = new HashSet<ProjectLeader>();
for (ProjectLeaderDto projectLeaderDto : projectDto.getProjectLeaderDtos()) {
ProjectLeader projectLeader = new ProjectLeader();
Professor professor = null;
if (projectLeaderDto.getId() != null && projectLeaderDto.getId() > 0L) {
projectLeader = projectLeaderRepository.findOne(projectLeaderDto.getId());
}
if (projectLeaderDto.getProfessorId() != null && projectLeaderDto.getProfessorId() > 0L) {
professor = professorRepository.findOne(projectLeaderDto.getProfessorId());
}
projectLeader.setName(projectLeaderDto.getName());
projectLeader.setSurname(projectLeaderDto.getSurname());
projectLeader.setProject(project);
projectLeader.setProfessor(professor);
projectLeaders.add(projectLeader);
}
// If collection from Dto miss some element from original collection, we
// remove it from original
Iterator<ProjectLeader> currentLeadersIterator = project.getProjectLeaders().iterator();
while (currentLeadersIterator.hasNext()) {
ProjectLeader projectLeader = currentLeadersIterator.next();
if (!projectLeaders.contains(projectLeader)) {
currentLeadersIterator.remove();
projectLeader.setProject(null);
}
}
// If original collection miss some element from Dto collection, we add
// it to original
Iterator<ProjectLeader> newLeadersIterator = projectLeaders.iterator();
while (newLeadersIterator.hasNext()) {
ProjectLeader projectLeader = newLeadersIterator.next();
if (!project.getProjectLeaders().contains(projectLeader)) {
project.getProjectLeaders().add(projectLeader);
projectLeader.setProject(project);
}
}
return project;
}
What can be potential reason for this?
I'm new here so please post me a link if there is similar question elsewhere. Thank you.
I think there is an issue in inserting, please note each project has one project leader, so if you put another leader to project, the old one will be deleted and new one will be inserted, I wrote small program about your issue:
ProjectLeader class:
and Test class