tomcat-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Apache Wiki <>
Subject [Tomcat Wiki] Update of "HowTo" by hotmaz
Date Fri, 14 May 2010 23:53:32 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Tomcat Wiki" for change notification.

The "HowTo" page has been changed by hotmaz.
The comment on this change is: added a new method for loading properties from WebApp by Maz.


  See AntDeploy
  == How do I load a properties file? ==
- Here are the two most popular ways::
+ Here are the three most popular ways::
+  * Use a classloader's getResource to get an url to the properties file and load it into
the Properties. The properties file must be located within the webapp classpath (i.e. either
WEB-INF/classes/... or in a jar.
+ A challenge is to get the classloader when you are in a static initializer:
+ {{{
+   public class Config {
+      private static java.util.Properties prop = new java.util.Properties();
+      private static loadProperties() {
+           // get class loader
+           ClassLoader loader = Config.class.getClassLoader();
+           if(loader==null)
+ 	    loader = ClassLoader.getSystemClassLoader();
+           // assuming you want to load located in WEB-INF/classes/conf/
+           String propFile = "conf/";
+  url = loader.getResource(propFile);
+ 	  try{prop.load(url.openStream());}catch(Exception e){Syste,.err.println("Could not load
configuration file: " + propFile);}
+      }
+   }
+ }}}
+ This method even works in a standalone java application. So it is my preferred way.
   * Use a `ResourceBundle`. See the Java docs for the specifics of how the `ResourceBundle`
class works. Using this method, the properties file must go into the `WEB-INF/classes` directory
or in a jar file contained in the `WEB-INF/lib` directory.

To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message