spring - modelMap.put() v/s modelMap.addAttribute() -

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in spring, difference between 

modelmap.put("key",value);

and

modelmap.addattribute("key",value);

addattributes implies check not null in attribute name -> see sources

 /**      * add supplied attribute under supplied name.      * @param attributename name of model attribute (never <code>null</code>)      * @param attributevalue model attribute value (can <code>null</code>)      */     public modelmap addattribute(string attributename, object attributevalue) {         assert.notnull(attributename, "model attribute name must not null");         put(attributename, attributevalue);         return this;     }

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