public class TimerTest {

    public static void main(String[] args) {
        Timer timer = new Timer();
        timer.scheduleAtFixedRate(
                new TimerTask() {
                    int n = 0;
                    @Override
                    public void run() {
                        if (n==10)
                            throw new RuntimeException("task failed.");
                        System.out.print('.');
                        n++;
                    }
                },
                1000L,
                1000L
        );
    }
}

When the TimerTask runs 10 times it throws a RuntimeException, which cause the thread of Timer stopped. You will get the following output:

..........Exception in thread "Timer-0" java.lang.RuntimeException: task failed.
	at sync.test.TimerTest$1.run(TimerTest.java:16)
	at java.util.TimerThread.mainLoop(Timer.java:512)
	at java.util.TimerThread.run(Timer.java:462)

It is necessary to catch all exceptions in TimerTask. But the best way to schedule tasks is using Executor if you are working with JDK 5 or later. It is fast, with pooled thread, and more simple API to schedule tasks.

The source code can be downloaded or checked out from SVN. Please visit the project home page:

http://code.google.com/p/jexieditor/

The word "Jexi" is a combination of "Java" and "Lexi". See snapshot:

JOpenID supports sign on by OpenID 2.0 protocol, which enables user to sign on with their OpenID account without registration on your website. The well-known OpenID providers are Google account, Yahoo account, etc.

JOpenID is simple, fast and very small, about 50 KB including both binary and source code. You can download from:

http://code.google.com/p/jopenid/downloads/list

For more information about JOpenID, please visit the project home page:

http://code.google.com/p/jopenid/

JOpenID is now on the list of recommended libraries on OpenID official website:

This is really a good news, and for Java developers they can write some code to make the 3rd-part site to connect to Google. There are already lots of libaries that can be used in J2EE. However, after I do some evaluation of these libaries, I do not find a suitable libary. The well-known "OpenID4Java", is too large (46MB!), with dependencies on many other libaries. So I decided to write a small, but very lightweight libary to support OpenID 2.0 spec, called "JOpenID".

It is very small, about 50KB including both source & binary. You can download from:

http://code.google.com/p/jopenid/downloads/list.

It only depends commons-logging!

Sample code is provided:

http://code.google.com/p/jopenid/source/browse/trunk/JOpenId/src/com/javaeedev/openid/Main.java

It has been fully tested based on Google accounts. However, I think it also can support Yahoo! OpenID, but with little information provided by Yahoo! I do not test yet.

I have 5 years experiences in software development, especially Java and Python.