Claude Code
api
Bean Validation Annotations Not Triggered
@NotNull, @NotBlank, @Size and other validation annotations are added to bean fields but validation never executes. Invalid data passes through without error. Validation was added but not wired up properly.
Annotations exist but validator isn't invoked on bean creation or API calls.
Error Messages You Might See
Validation not triggered
Invalid data accepted without error
@NotNull fields allowed to be null
Common Causes
- @Valid annotation missing on controller method parameter
- BindingResult not checked, validation runs but errors ignored
- Validator not registered as Spring bean
- Wrong validation library (have annotations but no validator)
- Validation only works on method parameters, not field access
How to Fix It
Add @Valid on parameter: @PostMapping public void save(@Valid @RequestBody User user). Check for errors: public void save(@Valid User user, BindingResult result). If result.hasErrors(), validation failed. Ensure validator configured: Spring auto-configures with spring-boot-starter-validation. Test: send invalid data, should return 400 Bad Request with error details.
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Get HelpFrequently Asked Questions
How to enable validation?
Add spring-boot-starter-validation dependency. Add @Valid on controller parameters. Spring auto-detects and validates.
How to check validation errors?
BindingResult parameter after @Valid parameter: if (result.hasErrors()) { handle errors }. Errors available in result object.
What validation annotations are available?
@NotNull (not null), @NotBlank (not empty), @Size(min=1), @Email (valid email), @Min/@Max (number range), @Pattern (regex).