java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.springframework.util.LinkedCaseInsensitiveMap.putAll(LinkedCaseInsensitiveMap.java:101)
at org.springframework.http.HttpHeaders.putAll(HttpHeaders.java:907)
at org.springframework.http.ResponseEntity$DefaultBuilder.headers(ResponseEntity.java:384)
at undefined.ResponseEntityTest.createResponseEntity(ResponseEntityTest.java:33)
at undefined.ResponseEntityTest.test(ResponseEntityTest.java:17)

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