[Bug 58505] getParameter but null

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=58505

--- Comment #1 from ArLi Weng <arliw...@gmail.com> ---
this's p.java:

package j2eetest;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(name = "p", urlPatterns = {"/p"})
public class p extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
        this.doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
        resp.setContentType("text/plain");
//        InputStream in = req.getInputStream();
//        byte[] bs = StreamReader.readAllBytes(in, false);
//        resp.getWriter().write(String.valueOf(bs.length));
//        resp.getWriter().write('\n');
//        resp.getWriter().write(new String(bs)); // here is work fine

        resp.getWriter().write('\n');
        try {
            resp.getWriter().write(req.getParameter("_mn")); //here i got null
            resp.getWriter().write('\n');
           
resp.getWriter().write(String.valueOf(req.getParameterMap().size()));
        } catch (Exception e) {
            e.printStackTrace(new PrintWriter(resp.getWriter()));
        }
    }
}

this's 8.0.28(last test version) response:

java.lang.NullPointerException
    at org.apache.catalina.connector.CoyoteWriter.write(CoyoteWriter.java:180)
    at j2eetest.p.doPost(p.java:30)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:217)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
    at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
    at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
    at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673)
    at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
    at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

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