UIMA pos tagger invalid output

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I gave two inputs to UIMA tagger. 1) JOHN IS VERY HAPPY TODAY. 2) john is very happy today.

in case 1) every thing turns out to be a Name and in second nothing turns out to be a name. Can some one please help me in the same?

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POS taggers tend to be a) case sensitive and b) fall back to noun. Thus what probably happens is this: for 1), it knows none of the words and falls back to noun. For 2) it does not recognize "John" as a name because it does not start with a capital letter and believes it to be something else.