Java Community | Help. Code. Learn.•2y ago

Spring boot: unable to instantiate ConstraintValidator: Unsatisfied dependency

I've got the following DTO with its own custom constraint annotation and relative validator:

// ...

@Data
public class MyResource {
    private String foo;
    private Integer bar;

    @Constraint(validatedBy = MyValidator.class)
    @Target({ElementType.PARAMETER})
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    public @interface MyResConstraint {
        public String message() default "";
        public Class<?>[] groups() default {};
        public Class<? extends Payload>[] payload() default {};
    }

    public class MyValidator implements ConstraintValidator<MyResConstraint, Object> {
        @Override
        public boolean isValid(Object value, ConstraintValidatorContext context) {
            System.out.println(value);
            System.out.println(context);

            return false;
        }

    }
}

// ...

@Data
public class MyResource {
    private String foo;
    private Integer bar;

    @Constraint(validatedBy = MyValidator.class)
    @Target({ElementType.PARAMETER})
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    public @interface MyResConstraint {
        public String message() default "";
        public Class<?>[] groups() default {};
        public Class<? extends Payload>[] payload() default {};
    }

    public class MyValidator implements ConstraintValidator<MyResConstraint, Object> {
        @Override
        public boolean isValid(Object value, ConstraintValidatorContext context) {
            System.out.println(value);
            System.out.println(context);

            return false;
        }

    }
}

I've applied to a @Validated RestController class method, as follows:

    @PostMapping(path = "/", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public ResponseEntity<?> whatever(
        @RequestBody @ModelAttribute @MyResConstraint
        MyResource res
    ) {

    @PostMapping(path = "/", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public ResponseEntity<?> whatever(
        @RequestBody @ModelAttribute @MyResConstraint
        MyResource res
    ) {

When I try to call the POST mapping, I get the following error:

[Request processing failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'com.example.demo.MyResource$MyValidator': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.example.demo.MyResource' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}]

[Request processing failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'com.example.demo.MyResource$MyValidator': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.example.demo.MyResource' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}]

What am I doing wrong? Thanks!

1 Reply

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Spring boot: unable to instantiate ConstraintValidator: Unsatisfied dependency