Threads (webservices etc)

Question

hi,
i'm writing webservices, portal components etc which use a custom-base-class which starts a thread and listens on a given port. so far so good. everything works fine etc etc.
but my problem is, when i re-deploy the application or i stop it within the visual administrator's deploy feature, the webservice or portalcomponent stops successful (cant open it using the portal or the webservice navigator), but the thread is still running and i dont know why. i even abstracted the finalize() function to kill my sub-threads, but that doesnt work either.
any help or suggestions? i just want to have my applications clean, so if i stop them, all subthreads will die... or even better, a function call.. like finalize() would ne the best damn thing for me.
thanks,
constantin

Answer 1

hi, this is a very simple code, just to demonstrate what i want to do.
this is a simple sap webservice, which i simply deploy and test the webservice using the "web services navigator" (function which is public to the service is "test(String)". so far so good. everything works as expected. but when i stop the web service with the deploy service using the visual administrator. the application and/or thread is still running... printing "zzz ZZZ zzz" in my debug log. even the simple checks in "run()" doesn't work. is there any work around? i COULD implement a function/service in my portal administration app which starts/stops applications using the sap deploy-service using the deploy.jar to start and stop the applications.. but let the application know that they are about to stop before, so they can shutdown their threads, open sockets etc...
package de.wsa.test;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class Test {
     private static final Log LOG = LogFactory.getLog(Test.class);
     private TestThread thread;
     public Test() {
          LOG.debug("TEST");
          thread = new TestThread(this);
     public String test(String test) {
          LOG.debug("test");
          return test;
     protected void finalize() throws Throwable {
          LOG.debug("finalize");
          thread.setStop(true);
          super.finalize();
     public static class TestThread extends Thread {
          private static final Log LOG = LogFactory.getLog(TestThread.class);
          private Test test;
          private boolean stop = false;
          public TestThread(Test test) {
               LOG.debug("TestThread");
               this.test = test;
               start();
          public void setStop(boolean stop) {
               LOG.debug("setStop");
               this.stop = stop;
          public void run() {
               LOG.debug("run");
               while (true) {
                    if (stop) {
                         LOG.warn("stop");
                         break;
                    if (Thread.currentThread().isInterrupted()) {
                         LOG.warn("Thread.currentThread().isInterrupted()");
                         break;
                    if (isInterrupted()) {
                         LOG.warn("isInterrupted()");
                         break;
                    if (test == null) {
                         LOG.warn("test == null");
                         break;
                    LOG.debug("zzz ZZZ zzz");
                    try {
                         Thread.sleep(5000);
                    } catch (Exception e) {
                         //swallow silently
Edited by: Constantin Wildförster on Apr 23, 2010 11:46 AM