Question

我有2个Webservlet，其中一个正在Asynch模式下运行：

@WebServlet(name="myServlet", urlPatterns={"/asyncprocess"}, asyncSupported=true)
@ConditionalOnProperty(name="app.processasynch", havingValue="true")
public class AsyncServletGW extends HttpServlet {

    @Autowired
    private Stage1WorkersPool wp;
    private static final Logger LOGGER = LoggerFactory.getLogger(ProcessBusinessLogicStage1Impl.class);

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException{

        AsyncContext aCtx = request.startAsync(request, response);

        int paymentId = (new Random()).nextInt(100000);
        WorkerThread workerThread = wp.getPool().get(paymentId % wp.getNumWorkingThreads());
        ThreadUnitWorkImpl py = new ThreadUnitWorkImpl();
        String msgBody;

        if ("POST".equalsIgnoreCase(request.getMethod())){
            msgBody = request.getReader().lines().collect(Collectors.joining(System.lineSeparator()));
            py.setXmlRequest(msgBody);
            py.setACtx(aCtx);
            aCtx.getResponse().setContentType("text/plain");
            py.setResponse(aCtx.getResponse());
        }else{
            LOGGER.error("Not a POST request");
        }


        LOGGER.debug("Servlet Processing : " + py.toString());
        workerThread.addUnitOfWork(py);
    }
}

另一个处于同步模式

@WebServlet(name="myServlet", urlPatterns={"/syncprocess"})
@ConditionalOnProperty(name="app.processasynch", havingValue="false")
public class SyncServletGW extends HttpServlet {

    @Autowired
    private ProcessInSynchStages synchP;
    private static final Logger LOGGER = LoggerFactory.getLogger(ProcessBusinessLogicStage1Impl.class);

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException{

        ThreadUnitWorkImpl py = new ThreadUnitWorkImpl();

        String msgBody;

        if ("POST".equalsIgnoreCase(request.getMethod())){
            msgBody = request.getReader().lines().collect(Collectors.joining(System.lineSeparator()));
            response.setContentType("text/plain");
            py.setXmlRequest(msgBody);
            py.setResponse(response);
        }else{
            LOGGER.error("Not a POST request");
        }

        ArrayList<ThreadUnitWorkImpl> tuwList = new ArrayList<>();
        tuwList.add(py);
        synchP.runInSynch(tuwList);
    }
}

调用异步时，我得到了臭名昭著的异常：已解决[org.springframework.web.HttpMediaTypeNotAcceptableException：找不到可接受的表示形式]

在调试时，我注意到第一次调用异步servlet之后，第二，第三等总是被延迟。 1-2秒后，将引发以上异常，并且正在处理servlet。但是，在同步模式下，一切运行顺利...有什么建议吗？

Answer 1

我的愚蠢错误...我忘了通过运行complete（）methoid来关闭AsyncContext。...

HttpMediaTypeNotAcceptableException：找不到可接受的表示形式发生在异步模式下，而不是在同步模式下

1 个答案: