我有一个返回JSON响应的servlet。如果我先执行response.getWriter，然后再执行response.reset()，然后设置标题并打印输出，则一切都很好。删除response.reset()后，尽管在浏览器中正确显示了输出，但在Jetty服务器上运行时却出现了异常。
SEVERE: Error while closing the output stream in order to commit response. java.lang.IllegalStateException: WRITER at org.eclipse.jetty.server.Response.getOutputStream(Response.java:917) at org.glassfish.jersey.servlet.internal.ResponseWriter.writeResponseStatusAndHeaders(ResponseWriter.java:176) at org.glassfish.jersey.server.ServerRuntime$Responder$1.getOutputStream(ServerRuntime.java:667) at org.glassfish.jersey.message.internal.CommittingOutputStream.commitStream(CommittingOutputStream.java:200) at org.glassfish.jersey.message.internal.CommittingOutputStream.flushBuffer(CommittingOutputStream.java:305) at org.glassfish.jersey.message.internal.CommittingOutputStream.commit(CommittingOutputStream.java:261) at org.glassfish.jersey.message.internal.CommittingOutputStream.close(CommittingOutputStream.java:276) at org.glassfish.jersey.message.internal.OutboundMessageContext.close(OutboundMessageContext.java:839) at org.glassfish.jersey.server.ContainerResponse.close(ContainerResponse.java:412) at org.glassfish.jersey.server.ServerRuntime$Responder.writeResponse(ServerRuntime.java:750) at org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:424) at org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:414) at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:311) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) at org.glassfish.jersey.internal.Errors.process(Errors.java:315) at org.glassfish.jersey.internal.Errors.process(Errors.java:297) at org.glassfish.jersey.internal.Errors.process(Errors.java:267) at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:291) at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1140) at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:403) at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:386) at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:334) at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:221) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:860) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650) at org.eclipse.jetty.servlets.GzipFilter.doFilter(GzipFilter.java:51) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1629) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) at org.eclipse.jetty.server.Server.handle(Server.java:530) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:347) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:256) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102) at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:247) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:140) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:382) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:708) at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:626) at java.lang.Thread.run(Thread.java:748)我检查了API Docs，但完全没有帮助。
工作代码（带有response.reset（））
public Response getData ( @Context HttpServletRequest request, @Context HttpServletResponse response) throws IOException, SQLException, ServletException { Writer out = null; try { request.setCharacterEncoding("UTF-8"); out = response.getWriter(); response.reset(); response.setCharacterEncoding("UTF-8"); response.setContentType("application/json"); response.addHeader("content-type", "gzip"); //Print the output in json format using out.write() } catch (Exception e) { return Response.status(400).entity("{\n\"Error Message\":\"" + StringEscapeUtils.escapeJson(e.getMessage().trim()) + "\"\n}").build(); } out.flush(); return Response.ok().entity("").build(); }我也尝试过设置标题，然后再执行getWriter，但这没有帮助。请提出确切的response.reset在这里做什么，有什么办法可以摆脱它。
使用Jetty版本9.4.8.v20180619
我有一个返回JSON响应的servlet。如果我执行response.getWriter，然后执行response.reset（）然后设置标题并打印输出，则一切都很好。我一移除...
java.lang.IllegalStateException: WRITER
at org.eclipse.jetty.server.Response.getOutputStream(Response.java:917)
at org.glassfish.jersey.servlet.internal.ResponseWriter.writeResponseStatusAndHeaders(ResponseWriter.java:176)