Hi experts,

I am using a an xml document to configure the Log4j from apache.
However, I am seeing an class cast exception when I try to run my Java
program which configures the log4j through a xml document. The trace is
attached. I don't understand the following 2 errors:
1. java.lang.ClassCastException: org.apache.log4j.ConsoleAppender cannot
be cast to org.apache.log4j.Appender
2.log4j:ERROR Could not parse input source
[org.xml.sax.InputSource@(protected)].
java.lang.NullPointerException

I am sure that the xml is well-formed because I was able to use that xml
in an existing system. I have also attached the xml config file. If
anyone can provide some pointers, it'd be greatly appreciated!

StackTrace
***
log4j:ERROR Could not create an Appender. Reported error follows.
java.lang.ClassCastException: org.apache.log4j.ConsoleAppender cannot be
cast to org.apache.log4j.Appender
 at
org.apache.log4j.xml.DOMConfigurator.parseAppender (DOMConfigurator.java:165)

 at
org.apache.log4j.xml.DOMConfigurator.findAppenderByName (DOMConfigurator.java:140)

 at
org.apache.log4j.xml.DOMConfigurator.findAppenderByReference (DOMConfigurator.java:153)

 at
org.apache.log4j.xml.DOMConfigurator.parseChildrenOfLoggerElement (DOMConfigurator.java:415)

 at
org.apache.log4j.xml.DOMConfigurator.parseRoot (DOMConfigurator.java:384)
 at org.apache.log4j.xml.DOMConfigurator.parse (DOMConfigurator.java:783)
 at
org.apache.log4j.xml.DOMConfigurator.doConfigure (DOMConfigurator.java:666)
 at
org.apache.log4j.xml.DOMConfigurator.doConfigure (DOMConfigurator.java:616)
 at
org.apache.log4j.xml.DOMConfigurator.doConfigure (DOMConfigurator.java:584)
 at org.apache.log4j.xml.XMLWatchdog.doOnChange(DOMConfigurator.java:815)
 at
org.apache.log4j.helpers.FileWatchdog.checkAndConfigure (FileWatchdog.java:80)

 at org.apache.log4j.helpers.FileWatchdog.<init>(FileWatchdog.java:49)
 at org.apache.log4j.xml.XMLWatchdog.<init>(DOMConfigurator.java:807)
 at
org.apache.log4j.xml.DOMConfigurator.configureAndWatch (DOMConfigurator.java:574)

 at
org.apache.log4j.xml.DOMConfigurator.configureAndWatch (DOMConfigurator.java:557)

  ...
log4j:ERROR Could not parse input source [org.xml.sax.InputSource@(protected)].
java.lang.NullPointerException
 at java.util.Hashtable.put(Unknown Source)
 at
org.apache.log4j.xml.DOMConfigurator.findAppenderByName (DOMConfigurator.java:141)

 at
org.apache.log4j.xml.DOMConfigurator.findAppenderByReference (DOMConfigurator.java:153)

 at
org.apache.log4j.xml.DOMConfigurator.parseChildrenOfLoggerElement (DOMConfigurator.java:415)

 at
org.apache.log4j.xml.DOMConfigurator.parseRoot (DOMConfigurator.java:384)
 at org.apache.log4j.xml.DOMConfigurator.parse (DOMConfigurator.java:783)
 at
org.apache.log4j.xml.DOMConfigurator.doConfigure (DOMConfigurator.java:666)
 at
org.apache.log4j.xml.DOMConfigurator.doConfigure (DOMConfigurator.java:616)
 at
org.apache.log4j.xml.DOMConfigurator.doConfigure (DOMConfigurator.java:584)
 at org.apache.log4j.xml.XMLWatchdog.doOnChange(DOMConfigurator.java:815)
 at
org.apache.log4j.helpers.FileWatchdog.checkAndConfigure (FileWatchdog.java:80)

 at org.apache.log4j.helpers.FileWatchdog.<init>(FileWatchdog.java:49)
 at org.apache.log4j.xml.XMLWatchdog.<init>(DOMConfigurator.java:807)
 at
org.apache.log4j.xml.DOMConfigurator.configureAndWatch (DOMConfigurator.java:574)

 at
org.apache.log4j.xml.DOMConfigurator.configureAndWatch (DOMConfigurator.java:557)

 ...
***

XML Config file
***
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
<appender name="NullAppender" class="org.apache.log4j.varia.NullAppender">
</appender>

<appender name="AGENTFILE" class="org.apache.log4j.RollingFileAppender">
 <param name="File" value="./jagent/agent.log"/>
 <param name="Append" value="false"/>
 <param name="MaxFileSize" value="500KB"/>
 <param name="MaxBackupIndex" value="1"/>
 <param name="Threshold" value="DEBUG"/>
 <layout class="org.apache.log4j.PatternLayout">
  <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p
[%t][%c] %m%n"/>
 </layout>     </appender>

<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
 <param name="Threshold" value="DEBUG"/>
 <param name="Target" value="System.out"/>

 <layout class="org.apache.log4j.PatternLayout">
  <!-- The default pattern: Date Priority [Category] Message\n -->
  <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c{1}]
%m%n"/>
 </layout>
</appender>

<root>
 <priority value="WARN"/>
 <appender-ref ref="CONSOLE" />
</root>

</log4j:configuration>
***


Regards,
Tom