对象被标记为“ javax.validation.constraints.NotNull”，但未在此构造方法中初始化

Question

I have the following Object

import javax.validation.Valid;
import javax.validation.constraints.NotNull;

public class SomeObject {
    @Valid
    @NotNull
    private int someCount;

    public int getSomeCount() {
        return someCount;
    }

    public void setSomeCount(final int someCount) {
        this.someCount = someCount;
    }

    public SomeObject(final int someCount) {
        this.someCount = someCount;
    }
}

But I get

"someCount" is marked "javax.validation.constraints.NotNull" but is not initialized in this constructor.

and it's pointing to the constructor. I'm passing an item into the constructor. How do I fix this

Answer 1

You are having a primitive type int here. It can't be null. Rather I would suggest you using @Min(0) validator instead. If you really need to have null passed in as a value then use a wrapper Integer instead. For that you can have a null check as above. I don't recommend this approach though.

Answer 2

"javax.validation.constraints.NotNull" but is not initialized in this constructor

We have recently encountered this issue in our sonar build.

To fix this issue we initialized the non-null field at the time of deceleration itself.

Consider below code.

public class Dummy {

    @NotNull(message = "Dummy field cannot be null")
    private Integer dummyField = -1; // Any default value


    public Dummy(Integer dummyField) {
        this.dummyField = dummyField;
    }

    public Integer getDummyField() {
        return dummyField;
    }

    public void setDummyField(Integer dummyField) {
        this.dummyField = dummyField;
    }


}