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java.lang.NullPointerException: null 	at java.util.LinkedList$ListItr.next(LinkedList.java:891)	at com.sun.jersey.spi.container.servlet.WebComponent$Writer.writeHeaders(WebComponent.java:339)	at com.sun.jersey.spi.container.servlet.WebComponent$Writer.finish(WebComponent.java:266)	at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:311)	at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1510)	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)	at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:540)	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:715)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)	at io.dropwizard.jetty.NonblockingServletHolder.handle(NonblockingServletHolder.java:49)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1515)	at org.eclipse.jetty.servlets.UserAgentFilter.doFilter(UserAgentFilter.java:83)	at org.eclipse.jetty.servlets.GzipFilter.doFilter(GzipFilter.java:295)	at io.dropwizard.jetty.BiDiGzipFilter.doFilter(BiDiGzipFilter.java:127)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1486)	at io.dropwizard.servlets.ThreadNameFilter.doFilter(ThreadNameFilter.java:29)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1486)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:519)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1097)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:448)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1031)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:136)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)	at com.codahale.metrics.jetty9.InstrumentedHandler.handle(InstrumentedHandler.java:173)	at io.dropwizard.jetty.RoutingHandler.handle(RoutingHandler.java:51)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)	at org.eclipse.jetty.server.handler.StatisticsHandler.handle(StatisticsHandler.java:162)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)	at org.eclipse.jetty.server.Server.handle(Server.java:446)	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:271)	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:246)	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.run(AbstractConnection.java:358)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:601)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:532)	at java.lang.Thread.run(Thread.java:745)