Spring Boot JPA One-to-One mapping generates StackOverflow Error

Question

Trying to run Spring-Boot JPA on MySQL and literally followed this tutorial here : https://spring.io/guides/gs/accessing-data-mysql/ All went well as expected.

However, moment I brought in a new Entity viz. Address of the User and established 1-to-1 unidirectional mapping, the Application starts to throw StackOverFlow error - even though the mapping is very basic that I have used without issues on App Servers (e.g GlassFish/Payara 5) several times.

Below is the mapping :

In User Entity

@OneToOne(mappedBy = "user", optional = false, cascade = CascadeType.ALL)
private Address address;

..the other side of the relationship i.e. in Address :

@OneToOne(fetch = FetchType.LAZY)
@JoinColumn(name="USER_ID")
private User user;

Expected : A single line : {"id":1,"name":"First","email":"[email protected]","address":{"id":2,"line1":"Line1","postcode":"PST CD","city":"City","state":"State","country":"IN"

Actual : The above line being printed on console countless times this there is a StackOverflow Error.

Answer 1

If you mean "Infinite recursion (StackOverflowError)".

You might need to add @JsonIgnore to the mapping parameters(Above your onetoone relationship) to stop looping.