java - Servlet seems to handle multiple concurrent browser requests synchronously -

as far know java servlets handling multiple requests concurrently , i've searched through stackoverflow google, , confirmed thought. quite confused right now, wrote simple servlets seem show blocking behaviour.

so have simple servlet:

public class myservlet extends httpservlet  {     private static final long serialversionuid = 2628320200587071622l;      private static final logger logger = logger.getlogger(myservlet.class);      @override     protected void doget(httpservletrequest req, httpservletresponse resp) throws servletexception, ioexception      {         logger.info("[doget] test before");          try {             thread.sleep(60000);         } catch (interruptedexception e) {             // todo auto-generated catch block             e.printstacktrace();         }         logger.info("[doget] test after");      resp.setcontenttype("text/plain");     resp.getwriter().write("ok");      } } 

then have 2 browser windows, opened @ ~same time hit servlet. , result first request blocking 2nd one. log shows:

10:49:05,088 [http-8383-processor14]  info myservlet - [doget] test before 10:50:05,096 [http-8383-processor14]  info myservlet - [doget] test after 10:50:05,106 [http-8383-processor22]  info myservlet - [doget] test before 10:51:05,112 [http-8383-processor22]  info myservlet - [doget] test after 

i feel missing ... servlets supposed able handle concurrent request, doesnt seem doing it. did same above on service method instead of doget , same thing.

any pointers?

thanks

your browser apparently using same http connection in different windows. servlet container uses single thread per http connection, not per http request. should run 2 physically different webbrowsers test properly. e.g. 1 firefox , 1 chrome.