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reactjsspring-bootjpanullentities
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Reputation: 21

React/Spring-boot cannot display @ManyToOne relation when some are null

I have 3 entities : project, userProject and standardProject, both userProject and standardProject are a @ManyToOne relationship with entity project.

I want to display these entities in my Project view, to do so I implemented for both entities the following in my Project.java :

@OneToMany(mappedBy = "projet", fetch = FetchType.EAGER)
private Set<UtilisateurProjet> utilisateurs = new HashSet<>();

@OneToMany(mappedBy = "projet")
private Set<StandardProjet> standardProjets = new HashSet<>();

And added the @JoinColumn in both entities .java files :

@ManyToOne
@JoinColumn(name = "projet_id")
@JsonIgnoreProperties(value = "utilisateurs", allowSetters = true)
private Projet projet;

I display them in my React file. Important point, these relationships can be NULL, sometimes a Project do not have any user or standard related so the following column is empty in my view. However, this is working correctly for userProject but not for standardProject which throw me :

TypeError: Cannot read property 'map' of null

When I try to display them.

Any guess ?

Upvotes: 1

Views: 450

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