Not true. Marking a thread as a daemon simply tells the JVM how to handle the thread at shutdown. Once the JVM gets to a state where the only threads running are ALL daemon threads, it will shut down. The thread which calls main() is NOT a daemon thread, so this situation can only occur once main() has returned. Essentially, once main() has returned, the JVM waits for all NON-daemon threads to complete before terminating all the remaining daemon threads and then exiting.
A thread can be stopped regardless of whether it is a daemon or not. (Strictly, a thread cannot be forcibly stopped - it must stop itself by returning from its run() method). Besides, Harm does do setDaemon(true) immediately before starting the thread. Dan. -- Danny Yates -----Original Message----- From: Andreas Mecky [mailto:[EMAIL PROTECTED] Sent: 25 September 2003 11:20 To: [EMAIL PROTECTED] Subject: Re: [JBoss-user] mbean question You must use setDaemon(true); Now your thread is generated as a child process of your thread and can be stopped by the JVM. Default is false and then the thread just lives on. HTH Andreas ----- Original Message ----- From: <[EMAIL PROTECTED]> To: "jboss mailing list " <[EMAIL PROTECTED]> Sent: Thursday, September 25, 2003 10:08 AM Subject: [JBoss-user] mbean question > Hi all, > > I'm trying to write a basic MBean. > This Mean runs a Thread which checks the file system for new files. If a > new file is found it should perform some action. > > My problem however is that whenever I undeploy, or stop the MBean using > the jmx-console application, the MBean keeps running. > > I have no idea what I'm doing wrong here. > > Below is my code. Could somebody please tell me what it is that I'm doing > wrong here? > > Thanks a lot, > > Harm de Laat > Informatiefabriek > The Netherlands > > > package nl.informatiefabriek.jmxlizard; > > import java.io.File; > import java.io.FileInputStream; > import java.io.FileOutputStream; > import java.io.IOException; > import java.util.Vector; > > import org.jboss.system.ServiceMBeanSupport; > > /** > * @author harm > */ > public class JBossLizard > extends ServiceMBeanSupport > implements JBossLizardMBean, Runnable { > > private Thread lizard; > > public JBossLizard() { > } > > public String getName() { > return "JBossJMXLizard"; > } > > /* (non-Javadoc) > * @see java.lang.Runnable#run() > */ > public void run() { > > boolean running = true; > while (running) { > /* wait for interval milliseconds */ > sleep(interval); > > /* do some checking */ > File checkDir = new File(absoluteCheckPath); > if (!checkDir.exists()) { > log.warn( > "Directory does not exist: " + > checkDir.getAbsolutePath()); > sleep(1000 * 5); > // we wait for five seconds to avoid a > huge system load > continue; > } > > if (!checkDir.isDirectory()) { > log.warn( > "Directory: " > + > checkDir.getAbsolutePath() > + "is not a directory."); > sleep(1000 * 5); > continue; > } > > /* retrieve the listing */ > String[] dirlist1 = checkDir.list(); > for (int i = 0; i < dirlist1.length; i++) { > /* don't touch hidden files */ > if (dirlist1[i].startsWith(".")) { > // System.out.println("Hidden > file... Leaving it untouched: " + dirlist1[i]); > break; > } > > /* get file extension */ > int index = dirlist1[i].lastIndexOf('.'); > String checkFileExtension = > dirlist1[i] > .substring(index + 1, > dirlist1[i].length()) > .toLowerCase(); > System.out.println( > "File extension is: " + > checkFileExtension); > /* see if it is a file we should process > */ > if (checkFileExtension > .equals(this > .getFileExtension().toLowerCase())) { > System.out.println( > "This is the correct file > extension."); > /* Create a file handler */ > File f = new File(checkDir, > dirlist1[i]); > > // process the file here! > } > > } > } > System.out.println("Lizard stopped..."); > } > > private void sleep(long howlong) { > try { > Thread.sleep(howlong); > } catch (Exception e) { > } > } > > /* MBean methods */ > protected void startService() throws Exception { > // Create a new thread with this monitor > lizard = new Thread(this, "JBossMonitor"); > // Set it as a daemon > lizard.setDaemon(true); > // start the thread > lizard.start(); > } > > protected void stopService() { > lizard.interrupt(); > } > } > > > ------------------------------------------------------- > This sf.net email is sponsored by:ThinkGeek > Welcome to geek heaven. > http://thinkgeek.com/sf > _______________________________________________ > JBoss-user mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/jboss-user ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user _____________________________________________________________________ Notice to recipient: The information in this internet e-mail and any attachments is confidential and may be privileged. 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