为了更加清楚的了解JSF请求在每一个生命周期中的执行情况，我们有时候需要打开JSF本身的log，查看log 输出情况。本文以Sun的JSF RI 1.2为例，说明如何打开log。
通过源码可以看出， Sun JSF RI 1.2使用的日志是Java.util.Logging，这个与Apache的Log4J略有不同，是JVM级别的log，但是在Tomcat 6中对这个Log进行了扩展，详细的扩展信息可以参考http://tomcat.apache.org/tomcat-6.0-doc/logging.html，这里我们仅仅介绍如何使用。
打开方法很简单，在我们单独的Web应用的src目录下，添加一个logging.properties文件，文件内容如下：
Java代码
1. handlers = org.apache.juli.FileHandler, java.util.logging.ConsoleHandler
2.
3. ############################################################
4. # Handler specific properties.
5. # Describes specific configuration info for Handlers.
6. ############################################################
7.
8. org.apache.juli.FileHandler.level = FINE
9. org.apache.juli.FileHandler.directory = ${catalina.base}/logs
10. org.apache.juli.FileHandler.prefix = sample.
11.
12. java.util.logging.ConsoleHandler.level = FINE
13. java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter
14.
15. javax.enterprise.resource.webcontainer.jsf.level=FINE
16. javax.enterprise.resource.webcontainer.jsf.lifecycle.level=FINE
handlers = org.apache.juli.FileHandler, java.util.logging.ConsoleHandler
############################################################
# Handler specific properties.
# Describes specific configuration info for Handlers.
############################################################
org.apache.juli.FileHandler.level = FINE
org.apache.juli.FileHandler.directory = ${catalina.base}/logs
org.apache.juli.FileHandler.prefix = sample.
java.util.logging.ConsoleHandler.level = FINE
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter
javax.enterprise.resource.webcontainer.jsf.level=FINE
javax.enterprise.resource.webcontainer.jsf.lifecycle.level=FINE
这样就会打开Sun中所有的JSF log日志，记录在Tomcat/logs/sample.xxx.log文件中。如果只需要生命周期的，把倒数第二行去掉即可。
Sun的这些日志信息记录在Util类中，相关信息如下：
Java代码
1. public static final String FACES_LOGGER = "javax.enterprise.resource.webcontainer.jsf";
2.
3. public static final String FACES_LOG_STRINGS =
4. "com.sun.faces.LogStrings";
5.
6. // Log instance for this class
7. private static final Logger LOGGER = getLogger(FACES_LOGGER);
8.
9. // README - make sure to add the message identifier constant
10. // (ex: Util.CONVERSION_ERROR_MESSAGE_ID) and the number of substitution
11. // parameters to test/com/sun/faces/util/TestUtil_messages (see comment there).
12.
13. // Loggers
14. public static final String RENDERKIT_LOGGER = ".renderkit";
15. public static final String TAGLIB_LOGGER = ".taglib";
16. public static final String APPLICATION_LOGGER = ".application";
17. public static final String CONTEXT_LOGGER = ".context";
18. public static final String CONFIG_LOGGER = ".config";
19. public static final String LIFECYCLE_LOGGER = ".lifecycle";
20. public static final String TIMING_LOGGER = ".timing";
From: http://hintcnuie.iteye.com/blog/193500