Using StringMatchFilter in Log4J XML Config. File?

Question

I'm trying to use the StringMatchFilter in an appender to determine based on the contents of the message when to send an email, when testing with single words it works great. For example if the message has "Here is a DEBUG" and my "StringToMatch" value is DEBUG then that message is correctly identified. However if I want to match on more specific string like "Here is DEBUG" for my "StringToMatch" value it will match on every message that has the word "Here" in it anywhere. So it would incorrectly match on "Here is a WARN" when the "StringToMatch" value specified is "Here is DEBUG". Below are my two files I'm using to run my test. How should I specify a string with embedded spaces for this to work? I've tried with single quotes inside the double quotes like this: "'Here is DEBUG'" but it still matched on 'Here'.
My XML Config. file looks like this:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
  <appender name="EMAIL"  class="org.apache.log4j.net.SMTPAppender">
          <param name="BufferSize" value="512" />
          <param name="SMTPHost" value="???" />
          <param name="From" value="???" />
          <param name="To" value="???" />
          <param name="Subject" value="Test LogMessage" />
          <layout class="org.apache.log4j.PatternLayout">
                  <param name="ConversionPattern" value="[%d{ISO8601}]%n%n%-5p%n%n%c%n%n%m%n%n" />
          </layout>
          <filter class="org.apache.log4j.varia.StringMatchFilter">
                  <param name="StringToMatch" value="Here is DEBUG" />
                  <param name="AcceptOnMatch" value="true" />
          </filter>
          <filter class="org.apache.log4j.varia.LevelRangeFilter">
                  <param name="LevelMax" value="FATAL"/>
                  <param name="LevelMin" value="DEBUG"/>
          </filter>
  </appender>
  <root>
    <appender-ref ref="EMAIL"/>
  </root>
</log4j:configuration>and my test java code looks like this:
import org.apache.log4j.Logger;
import org.apache.log4j.xml.DOMConfigurator;
public class Test{
   static Logger logger = Logger.getLogger(Test.class);
   public static void main(String args[]) {
      DOMConfigurator.configure("/home/agsteam/testing/log4j/Test.xml");
      logger.debug("Here is DEBUG");
      logger.info("Here is some INFO blah");
      logger.warn("Here is some WARN");
      logger.error("Here");
      logger.fatal("fatal here");
}In the above example code every logger message matches, the debug, info, warn, error and fatal all match because of the the 'here' that is found in the message, even though the filter StringToMatch values has "Here is DEBUG".
Thanks for any help.

Answer 1

There's an XML parser in the tomcat common diretories. Check out the documentation for XML parser on www.java.sun.com for descriptions.
Basically there's two levels of XML parsing, the first generates "events" for tags, attributes etc. the second comiples into a tree of Node objects.