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Redirect question

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I have a question regarding redirect. I have noticed that when I do a redirect some (NOT ALL) of my model attributes are passed in the URL. I can't quite understand why. I have some attributes that I want to maintain throughout my controllers so I added the annotation @SessionAttributes with the name of the model attributes. In all my controllers, I use at least two of those session attributes but I can only see this particular one always being passed. If I update one of those session attributes, it gets passed on the URL as well. The one that ALWAYS gets passed in my URL is a String. Other types of objects don't get passed in my URL. Is that the reason? If it's a string and/or if I just updated the attributes that is a string, will it get passed in my URL? I redirect using strings. I also use Apache Tiles.

Thanks in advance for the clarification.

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By default all model attributes are considered to be exposed as URI template variables in the redirect URL. Of the remaining attributes those that are primitive types or collections/arrays of primitive types are automatically appended as query parameters.

Take a look at RedirectAttributes I commented on them a bit here


and here


You can find the java doc here:

Unlike other redirect attributes, which end up in the target redirect URL, flash attributes are saved in the HTTP session (and hence do not appear in the URL). The model of the controller serving the target redirect URL automatically receives these flash attributes after which they are removed from the session.

See more in the documentation here:

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