Java – jetty: stopping programmatically causes “1 thread cannot be stopped”

I have an embedded jetty 6.1 26 examples

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

 resp.setStatus(202,"Shutting down.");
 resp.setContentType("text/plain");
 ServletOutputStream os = resp.getOutputStream();
 os.println("Shutting down.");
 os.close();
 resp.flushBuffer();

 // Stop the server.
 try {
    log.info("Shutting down the server...");
    server.stop();
 } catch (Exception ex) {
    log.error("Error when stopping Jetty server: "+ex.getMessage(),ex);
 }

However, when I send a request, jetty doesn't stop - a thread has been hanging with this Org. On the line of wait() mortbay. thread. In queuedthreadpool:

// We are idle
   // wait for a dispatched job
   synchronized (this)
   {
       if (_job==null)
          this.wait(getMaxIdleTimeMs());
       job=_job;
       _job=null;
   }

…

2011-01-10 20:14:20,375 INFO  org.mortbay.log jetty-6.1.26
2011-01-10 20:14:34,756 INFO  org.mortbay.log Started SocketConnector@0.0.0.0:17283
2011-01-10 20:25:40,006 INFO  org.jboss.qa.mavenhoe.MavenHoeApp Shutting down the server...
2011-01-10 20:25:40,006 INFO  org.mortbay.log Graceful shutdown SocketConnector@0.0.0.0:17283
2011-01-10 20:25:40,006 INFO  org.mortbay.log Graceful shutdown org.mortbay.jetty.servlet.Context@1672bbb{/,null}
2011-01-10 20:25:40,006 INFO  org.mortbay.log Graceful shutdown org.mortbay.jetty.webapp.WebAppContext@18d30fb{/jsp,file:/home/ondra/work/Mavenhoe/trunk/target/classes/org/jboss/qa/mavenhoe/web/jsp}
2011-01-10 20:25:43,007 INFO  org.mortbay.log Stopped SocketConnector@0.0.0.0:17283
2011-01-10 20:25:43,009 WARN  org.mortbay.log 1 threads Could not be stopped
2011-01-10 20:26:43,010 INFO  org.mortbay.log Shutdown hook executing
2011-01-10 20:26:43,011 INFO  org.mortbay.log Shutdown hook complete

It will block for a minute and then turn off I added graceful shutdown, which should allow me to shut down the server from the servlet; However, it cannot be seen from the log

I solved this:

Server server = new Server( PORT );
server.setGracefulShutdown( 3000 );
server.setStopAtShutdown(true);
...
server.start();

if( server.getThreadPool() instanceof QueuedThreadPool ){
   ((QueuedThreadPool) server.getThreadPool()).setMaxIdleTimeMs( 2000 );
}

You need to call setMaxIdleTimeMs () after start (), because threadPool. is created in start (). However, threads have been created and wait, so it only applies after all threads have been used at least once

Except interrupt all threads or system I don't know what else to do besides some terrible things like exit ()

Any ideas? Is there a good way?

Solution

Graceful doesn't do what you want - it allows the server to shut down normally, but it doesn't allow you to shut down from within the servlet

The problem is described in the mailing list post you linked to - you are trying to stop the server while you are still processing the connection inside the server

You should try to change the servlet implementation to:

// Stop the server.
new Thread()
{
   public void run() {
     try {
        log.info("Shutting down the server...");
        server.stop();
        log.info("Server has stopped.");
     } catch (Exception ex) {
        log.error("Error when stopping Jetty server: "+ex.getMessage(),ex);
     }
   }
}.start();

In this way, the servlet can complete processing when the server shuts down without blocking the shutdown process