Could not write JSON: Infinite recursion (StackOverflowError); nested exception spring boot

Question

This is my District Controller, when I try to fetch data after saving I get the error, even when I try get object form getDistrict(Long id) the same strikes ple

Answer 1

That's because for Statemaster in json the set of Districtmaster's is put. And each Districtmaster has the Statemaster in itself, so it's also put into the json. So that you get the infinite recursion

    @JsonIgnore
    @OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY, 
    mappedBy="statemaster")
    public Set getDistrictmasters() {
        return this.districtmasters;
    }

Adding @JsonIgnore annotation on Set will prevent that recursion. You can put the @JsonIgnore at public Statemaster getStatemaster() either.