java jmx monitoring

The first step is to find out the Java process PID: Grep-v "awk ' {print $2} ' The second step is to find the most CPU -Consuming threads : PS-MP pid-o Thread,tid,sort-rn-k9The third step is to convert the TID to a three- input system : printf "%x\n" tidThe fourth step is to dump the JVM stack information : Jstack PIDthe NID in jstack corresponds to the preceding octal tid, thus finding the most CPU-consuming thread code. To get a thread usi

Versions earlier than Java 7 do not have native support. Let's talk about the solution of JDK 1.7 and earlier:Event-driven approach, without having to perform directory scans, but related to the platformThread round-robin scanning, implemented in java only, perfect cross-platform, but with a large number of listening files, the scanning volume is too large, and the response is not very timely, depending

intWatchid = Jnotify.addwatch (path, mask, Watchsubtree,NewListener ()); //sleep a little, the application would exit if you//don ' t (watching is asynchronous), depending on your//application, this could not be requiredThread.Sleep (1000000); //To remove watch the watch Booleanres =Jnotify.removewatch (Watchid); if(!Res) { //Invalid watch ID specified. } } classListenerImplementsJnotifylistener { Public voidFilerenamed (intWD, String RootPath, String oldna

", Baseutil.getextensionstate (Extensionstatus.getstatus ()));New WebSocket (). Broadcastall (Jsono);Call hold event for the time being}else if (event instanceof Parkedcallevent) {Parkedcallevent parkcall= (parkedcallevent) event;String Key=baseutil.getnumber (Parkcall.getfrom ());Key+=baseutil.channelpark_centent;Mapcache.put (Key, Parkcall.getexten ());Get Database Data Events}else if (event instanceof Dbgetresponseevent) {Dbgetresponseevent dbget= (dbgetresponseevent) event;}else if (event in

(file.length) After getting a long byte number, 1mb=1024kb,1kb=1024b, it is best to use this notation:BigDecimal megabyte = new BigDecimal (1024 * 1024);Float returnvalue = Filesize.divide (megabyte, 2, bigdecimal.round_up). Floatvalue ();More accurate accuracy !about how to make a jar package and run it in a timed way:Due to the use of three additional jar packages, all packaging methods are as follows:The first step:Step Two:The third step: Choose your own project, storage path, choose to joi

Getting event snooping requires a way to implement the ActionListener interface.public class SimpleEvent extends jframe{Private JButton jb=new JButton ("I am the button, click on Me");Public SimpleEvent () {SetLayout (NULL);SetVisible (TRUE);SetSize (200, 100);Setdefaultcloseoperation (Windowconstants.exit_on_close);Container C=getcontentpane ();C.add (JB);Jb.setbounds (10, 10, 300, 30);Jb.addactionlistener (New Jbaction ());}Class Jbaction implements actionlistener{@Overridepublic void actionpe

An action event occurs when the mouse clicks and releases;Method Summary:actionPerformed(ActionEvente)Called when an action occurs.Column:public class Shijian extends Frame{public static void Main (string[] args){Frame f = new frame ();F.setlayout (New FlowLayout (flowlayout.left,20,5));Button B1 = New button ("Stand-alone");Button B2 = New button ("Double-click");Button B3 = New button ("A3");Creating listenersMyactionlistener m = new Myactionlistener ();B1.addactionlistener (m);//Register the

lightweight processes in the running queueUS: User-State CPU utilizationSY: System State CPU usageID:CPU Idle Rate2. Toptop-09:42:04 up 3 days, 3 min, 1 user, load average:0.00, 0.01, 0.05tasks:108 Total, 3 running, sleeping, 0 Stopped, 0 zombie%cpu (s): 0.0 us, 0.0 sy, 0.0 ni,100.0 ID, 0.0 wa, 0.0 hi, 0.0 si, 0.0 stkib mem:1015472 Total , 104568 free, 84224 used, 826680 Buff/cachekib swap:0 Total, 0 free, 0 used.

(MouseEvent E) { the //System.out.println ("click event"); - //System.out.println (e.getclickcount ());//and the mouse lifted up almost - } - @Override + public voidmousepressed (MouseEvent E) { - //System.out.println ("mouse down"); + } a @Override at public voidmousereleased (MouseEvent E) { - //System.out.println ("mouse lift"); - } - @Override - public voidmouseentered (MouseEvent E) { -System.out.println ("the Mouse is coming in");

Packagecom.at221;ImportJava.awt.event.KeyAdapter;Importjava.awt.event.KeyEvent;ImportJavax.swing.JFrame; Public classTestKey { Public Static voidMain (string[] args) {JFrame F=NewJFrame (); F.addkeylistener (NewMykeylistener ()); F.setvisible (true); F.setsize (300, 300); } }classMykeylistenerextendskeyadapter{ Public voidkeytyped (KeyEvent e) {//The event that occurs when the keyboard strikes a key:System.out.println (E.getkeychar ()); } Public voidkeypressed (KeyEvent e) {//The event th

getconnection (String connectiondescription)throwsIOException, timeoutexception {connectionfactory connectionfactory=getconnectionfactory (); returnconnectionfactory.newconnection (connectiondescription); } Public Staticconnectionfactory getconnectionfactory () {connectionfactory connectionfactory=NewConnectionFactory (); Connectionfactory.sethost ("192.168.1.111"); Connectionfactory.setport (5672); Connectionfactory.setvirtualhost ("/"); Connectionfactory.setusername ("DRS"); Connectionfac

Test thread deadlock, run the following code: public class Test1 { private static Object O1 = new Object (); private static Object O2 = new Object (); public static void Main (string[] args) {for (int i = 0;ipublic void Run () { synchronized (O1) { synchronized (O2) { System.out.println ("AM O1"); } } }). Start (); New Thread (New Runnable () { @Override public void Run () { synchronized (O2) { synchronized (O1) { C19/>system.out.print

Linux lower port and service is corresponding, the Java process starts by default listening on 8080 port, if the service is hung up, 8080 port is not.The lsof-i:8080 port, if there is no output, indicates that the port is not working.Want to monitor the Java process 8080 port on the Zabbix platform, if the port hangs up can send an email or send a text message!Implementation method:1. Create a template firs

The JDK itself has a lot of monitoring tools, such as Jconsole.The tool we are going to talk about today is VISUALVM, which is one of them. But this tool is only in JDK1.6.07 and above. It is a good free monitoring tool to monitor the JVM heap, thread, class loading situation and JVM GC condition of Java programs.Monitoring range: JDK1.4 and above versions of the

= new Servicetask ();Stask.setid ("Sid");Stask.setname (name);Stask.setimplementation ("Activititest.printvariables");String implementationtype = implementationtype.implementation_type_delegateexpression;Stask.setimplementationtype (Implementationtype);return stask;}}------------Listener Class--------Package com.travesky.bluesky.activiti.utils;Import Java.util.Arrays;Import Org.activiti.bpmn.model.ActivitiListener;Import Org.activiti.engine.delegate.DelegateTask;Import Org.activiti.engine.deleg

"; System. out. println (count); S= S+count; if(Count = =1) {System. out. println ("1 start sleeping for 5 seconds"); Thread.Sleep ( the); System. out. println ("1 after sleeping,"); } System. out. println (count+"End of execution"); returns; } }}As the test code shows, the thread is not finished and will pass through the System. Out.println (f.get()); Blocking, this method does not end, and it can be used to monitor the execution time of the thread.If you remove System. This method ends

The path class of nio.2 provides a way to listen for changes to the file system.Register (watcherservice Watcher,watchevent.kindWatchservice has three methods to listen for file change events in the directory.Watchkey poll (): Gets the next Watchkey and returns null immediately if no watchkey occurs;Watchekey Poll (Long timeout,timeunit unit): Try to wait for timeout time to get the next watchkey;Watchkey take (): Gets the next Watchkey and waits if it doesn't happen;If the program needs to be m

codekeyevent.vk_9)) {System.out.println ("Must be a number"); E.consume (); } } }); //Add form EventF.addwindowlistener (NewWindowadapter () {@Override Public voidwindowclosing (windowevent e) {//TODO auto-generated Method StubSystem.exit (0); } }); //Adding mouse eventsBut.addmouselistener (NewMouseadapter () {@Override Public voidmouseclicked (MouseEvent e) {if(E.getclickcount () ==1) {T

Java Web concurrency: for update practices, monitoring and solving ., Javawebupdate Writer: BYSocket) Weibo: BYSocket Douban: BYSocket I. Preface We have been talking about concurrency. At present, there are two common practices: Lock Mechanism: 1. pessimistic lock; 2. Optimistic lock. However, this article is mainly used to record my processing experience. In addition, I hope to see the great gods, Daniel,

());7Frame.setvisible (true);8 }9 }Ten classMywindowlistenerImplementsWindowListener One { A @Override - Public voidwindowopened (windowevent e) { - } the //Click on the fork on the top of the window to call - @Override - Public voidwindowclosing (windowevent e) { -SYSTEM.OUT.PRINTLN ("World"); + //method of program exit -System.exit (0); + } A //when calling the Dispose method at @Override - Public voidwindowclosed (windowevent e) - { -System.out.