Hello,
I know that PropertyConfigurator support placeholders
and will resolve them using System properties or properties in the
configuration file
being parsed.
But what if I would like to supply properties (for the placeholders)
at runtime ?
suppose I have this in my config file:
log4j.appender.RollingFile.File = /var/log/${webapp.name}.log
and I want to set the value for the placeholder in a ServletContextListener.
option (a)
String webappName = servletContext.getServletContextName();
System.setProperty("webapp.name", webappName);
PropertyConfigurator.configure(url);
=> possible race condition since in Tomcat the system properties are
shared by all webapps (unfortunately)
option (b):
File configFile = ...
Properties properties = new Properties();
properties.load(new FileInputStream(configFile));
properties.setProperty("webapp.name", webappName);
PropertyConfigurator.configure(properties);
=> haven't tried this yet but I guess it would work.
option (c)
add these methods to PropertyConfigurator:
public static void configure(URL configURL, Properties placeholders);
public static void configure(String configFilename), Properties placeholders);
What do you think ?
Maarten
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