java.lang.NullPointerException

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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$DefaultBuilder.headers(ResponseEntity.java:384) at org.springframework.http.ResponseEntity$DefaultBuilder.headers(ResponseEntity.java:364) at ResponseEntityTest.createResponseEntity(ResponseEntityTest.java:33) at ResponseEntityTest.test(ResponseEntityTest.java:17)
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