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This exception has no message.
java.lang.NullPointerException at java.util.ArrayList.<init>(ArrayList.java:177)[rt.jar:1.8.0_92] at io.undertow.servlet.spec.HttpServletResponseImpl.getHeaders(HttpServletResponseImpl.java:248)[undertow-servlet-1.0.15.Final.jar:1.0.15.Final] at javax.servlet.http.HttpServletResponseWrapper.getHeaders(HttpServletResponseWrapper.java:303)[jboss-servlet-api_3.1_spec-1.0.0.Final.jar:1.0.0.Final] at org.springframework.http.server.ServletServerHttpResponse$ServletResponseHttpHeaders.get(ServletServerHttpResponse.java:160)[spring-web-4.2.7.RELEASE.jar:4.2.7.RELEASE] at org.springframework.http.server.ServletServerHttpResponse$ServletResponseHttpHeaders.containsKey(ServletServerHttpResponse.java:142)[spring-web-4.2.7.RELEASE.jar:4.2.7.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.addContentDispositionHeader(AbstractMessageConverterMethodProcessor.java:346)[spring-webmvc-4.2.7.RELEASE.jar:4.2.7.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:238)[spring-webmvc-4.2.7.RELEASE.jar:4.2.7.RELEASE]