validate constructor arguments or method parameters with annotations, and let them throw an exceptio

Posted by marius on Stack Overflow See other posts from Stack Overflow or by marius
Published on 2010-06-12T10:20:18Z Indexed on 2010/06/12 10:22 UTC
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I am validating constructor and method arguments, as I want to the software, especially the model part of it, to fail fast.

As a result, constructor code often looks like this

public MyModelClass(String arg1, String arg2, OtherModelClass otherModelInstance) {
    if(arg1 == null) {
        throw new IllegalArgumentsException("arg1 must not be null");
    }
    // further validation of constraints...
    // actual constructor code...
}

Is there a way to do that with an annotation driven approach? Something like:

public MyModelClass(@NotNull(raise=IllegalArgumentException.class, message="arg1 must not be null") String arg1, @NotNull(raise=IllegalArgumentException.class) String arg2, OtherModelClass otherModelInstance) {

    // actual constructor code...
}

In my eyes this would make the actual code a lot more readable.

In understand that there are annotations in order to support IDE validation (like the existing @NotNull annotation).

Thank you very much for your help.

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