Hi Curt,
Thanks for the suggestion. I am not familiar with class loaders so did
not think it would be needed info.
Indeed, I am in an environment where multiple classloaders are probably
used. Possibly since I am starting my main java program through
Eclipse's equinox. Equinox provides a sophisticated bundling system
which uses custom classloader for sure. With your pointer, I will have
to dig further into Equinox bundle loading to see if a the log4j.jar is
being loaded twice.
I am starting running the code through eclipse, and the main looks like
this:
public static void main(String[] args) {
System.getProperties().put("JavaAgentLogConfigFile",
"C:\\prototype\\log4j.xml");
String[] launcherArgs = {
"-configuration",
"C:\\prototype\\configuration",
"-install",
"C:\\prototype",
"-DJavaAgentLogConfigFile=C:\\OracleATS2\\OFT\\jagent\\log4j-commandline.xml"};
org.eclipse.core.launcher.Main.main(launcherArgs);
}
The directory point to an instance of eclipse install. I am configuring
this one since the eclipse environment has all the required plugins
including the log4j bundles.
If anyone has some pointer on how to debug a environment like this,
please let me know. I am just running this in eclipse debug mode.
Regards,
Tom
Curt Arnold wrote:
On Nov 4, 2008, at 1:32 PM, Tom Hsu wrote:
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
[EMAIL 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!
You don't mention the environment that you are running the code in,
but it would appear that you have multiple class loaders and that is
causing the cast from ConsoleAppender to Appender to fail. The
ClassCastException results in the NullPointerException that occurs
later. Please check if you have multiple log4j.jar's in your
installation.
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