4000b244ff
Prior to this commit, RestTemplate and HttpMessageConverterExtractor did not validate that the supplied HttpMessageConverter list contained no null elements, which can lead to a NullPointerException when the converters are accessed. This commit improves the user experience by failing immediately if the supplied HttpMessageConverter list contains a null element. This applies to constructors for RestTemplate and HttpMessageConverterExtractor as well as to RestTemplate#setMessageConverters(). Note, however, that RestTemplate#getMessageConverters() returns a mutable list. Thus, if a user modifies that list so that it contains null values, that will still lead to a NullPointerException when the converters are accessed. This commit also introduces noNullElements() variants for collections in org.springframework.util.Assert. Closes gh-23151
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