Java EE Servlet/JSP tutorial : Adding an error page, logging, and other forms of debugging

In progress....

Background on logging

Background information on logging

http://www.vogella.com/articles/Logging/article.html

http://onjava.com/onjava/2002/06/19/log.html

http://tutorials.jenkov.com/java-logging/index.html

http://docs.oracle.com/javase/7/docs/api/java/util/logging/SimpleFormatter.html

Common problem with logging

http://stackoverflow.com/questions/6315699/why-are-my-level-fine-logging-messages-not-showing

Understandng the outptut for logging

http://docs.oracle.com/javase/7/docs/technotes/guides/logging/index.html

http://docs.oracle.com/javase/7/docs/technotes/guides/logging/overview.html

http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html#syntax

http://docs.oracle.com/javase/7/docs/api/java/util/logging/SimpleFormatter.html#format(java.util.logging.LogRecord)

Resin and logging

Logging in Resin

http://www.caucho.com/resin-4.0/admin/logging.xtp

http://www.caucho.com/resin-4.0/admin/resin-admin-command-line.xtp#loglevelsettingloglevel

Changing log levels in Resin:

~/workspace/javaee/Servers/Resin 4.0 at localhost-config/resin.xml

...
  <!-- Logging configuration for the JDK logging API -->
  <log-handler name="" level="all" path="stdout:"
               timestamp="[%y-%m-%d %H:%M:%S.%s]"
               format=" {${thread}} ${log.message}"/>

...

  <!--
     - level='info' for production
     - 'fine' or 'finer' for development and troubleshooting
    -->
  <logger name="" level="${log_level?:'info'}"/>

  <logger name="com.caucho.java" level="config"/>
  <logger name="com.caucho.loader" level="config"/>

Changing log levels in Resin:

~/workspace/javaee/Servers/Resin 4.0 at localhost-config/resin.properties

# log_level : info
# app-0.log_level : finest