What does the @Valid annotation indicate in Spring?

Question

In the following example, the ScriptFile parameter is marked with an @Valid annotation.

What does @Valid annotation do?

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Answer 1

public String create(@Valid @NotNull ScriptFile scriptFile, BindingResult result, ModelMap modelMap) {    
    if (scriptFile == null) throw new IllegalArgumentException("A scriptFile is required");        

I guess this @NotNull annotation is valid therefore if condition is not needed.