Spring boot - How to validate Multipartfile in rest application

Question

I want to validate extension of Multipartfile object. I added @Valid and my custon annotation to parameter @ImageFileValid but it doesn't work.

@PutMapping("/{id}")
ProductDto updateProduct(@RequestPart @Valid ProductDto product, @PathVariable Long id,@RequestPart @Valid @ImageFileValid MultipartFile image) {
    return productMapper.productToProductDto(productService.update(productMapper.productDtoToProduct(product),id));
}

@xerx593 This is not question about difference between valid and validation — Mateusz Sobczak
– Mateusz Sobczak, Commented Dec 8, 2021 at 20:41

xerx593 · Accepted Answer · 2021-12-12 20:09:44Z

3

Very short but clear reference from Spring-Boot, Validation:

The method validation feature supported by Bean Validation 1.1 is automatically enabled as long as a JSR-303 implementation (such as Hibernate validator) is on the classpath. This lets bean methods be annotated with javax.validation constraints on their parameters and/or on their return value. Target classes with such annotated methods need to be annotated with the @Validated annotation at the type level for their methods to be searched for inline constraint annotations.

So, please annotate (the containing) controller class with @Validated & report if any issues.

A sample repo at github.

edited Dec 12, 2021 at 20:09

answered Dec 8, 2021 at 21:09

xerx593

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2 Comments

Jedupont Over a year ago

Hi @xerx593 , i'm using Spring boot 2.7 and i can't get to work. Do you have any idea please? I'm sending the multipart file with a json using mixed content-type.

xerx593 Over a year ago

..the easier in this scenario, @Jedupont: We want (he wanted) to validate the json "inside", in our new scenario, we want to validate the content type(/length/"file name"...) of a (multi)"part" which can/should be json...

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