> From: Yongqin Xu [mailto:yong...@hotmail.com] 
> Subject: RE: tomcat 7: is it possible to config tomcat common classloader to 
> point to other location?

> I mean, can I define my own placeholder there?

It's not a placeholder, it's a reference to a system property, evaluated when 
the .xml or .properties file is scanned.  Read the doc:

"Apache Ant-style variable substitution is supported; a system property with 
the name propname may be used in a configuration file using the syntax 
${propname}. All system properties are available including those set using the 
-D syntax, those automatically made available by the JVM and those configured 
in the $CATALINA_BASE/conf/catalina.properties file."

http://tomcat.apache.org/tomcat-7.0-doc/config/index.html

 - Chuck


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