Call to an asynchronous servlet on WebSphere 8 results in AsyncIllegalStateException

Question

I'm getting the following exception while calling a servlet:

com.ibm.ws.webcontainer.async.AsyncIllegalStateException: SRVE8010E: The current request does not support asynchronous servlet processing.

The servlet looks like this:

public class AsyncServlet extends HttpServlet {

  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

      try {
          AsyncContext async = req.startAsync();
          async.start(new Runnable(){
              @Override
              public void run() {
                System.out.println("Bazinga");
              }
          });
      } catch (Exception e) {
        e.printStackTrace();
      }

  }
}

I've tried to set it as asynchronous using annotations:

@WebServlet(urlPatterns = "/asyncServlet", asyncSupported = true)

And also in web.xml after reading a post in a forum:

<servlet>
    <display-name>AsyncServlet</display-name>
    <servlet-name>AsyncServlet</servlet-name>
    <servlet-class>com.lala.lala.AsyncServlet</servlet-class>
    <init-param>
        <param-name>com.ibm.ws.webcontainer.async-supported</param-name>
        <param-value>true</param-value>
    </init-param>
</servlet>
<servlet-mapping>
    <servlet-name>AsyncServlet</servlet-name>
    <url-pattern>/asyncServlet</url-pattern>
</servlet-mapping>

Still getting the AsyncIllegalStateException. How did you get async servlets run on WAS8?

The error which you are receiving is beacuse there must be some sync servlet or filter in between your called servlet http://pic.dhe.ibm.com/infocenter/wasinfo/v8r5/index.jsp?topic=/com.ibm.websphere.messages.doc/com.ibm.ws.webcontainer.resources.Messages.html check for your error code SRVE8010E — Meherzad, Feb 18 '13 at 06:19
Go through this tutorial of async servlet http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/async-servlet/async-servlets.html — Meherzad, Feb 18 '13 at 06:21

score 2 · Answer 1 · answered Feb 21 '13 at 22:24

I found something similar on one of the forums, maybe it will help:

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.AsyncContext;
import javax.servlet.ServletException;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(urlPatterns = "/AsyncServlet", asyncSupported = true)
public class AsyncServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;


protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {

    // Record the servlet's thread
    PrintWriter out = response.getWriter();
    out.printf("<h3>Servlet's thread: %s</h3>", Thread.currentThread());
    out.flush();

    // Put the request into asynchronous mode
    request.startAsync();

    // Run an asynchronous task via servlet 3.0's abstractions
    AsyncContext asyncCtx = request.getAsyncContext();
    MyTask mt = new MyTask(asyncCtx);
    asyncCtx.start(mt);

    // Run another asynchronous task via java's abstractions
    MyTask mt02 = new MyTask(asyncCtx);
    new Thread(mt02).start();

    out.printf("<h3>Servlet finishes its job</h3>");
}

public class MyTask implements Runnable {

    AsyncContext asyncContext;

    public MyTask(AsyncContext asyncContext) {
        this.asyncContext = asyncContext;
    }

    @Override
    public void run() {
        ServletResponse response = asyncContext.getResponse();
        try {
            // do the time-consuming job
            PrintWriter out = response.getWriter();
            for (int i = 0; i < 5; i++) {
                out.printf("<h2>Hello from thread: %s (%d)</h2>", Thread.currentThread(), i);
                out.flush();
                Thread.sleep(1 /* secs */ * 1000);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            asyncContext.complete();
        }
    }
}
}

found here

Call to an asynchronous servlet on WebSphere 8 results in AsyncIllegalStateException

1 Answers1