Examples of org.apache.log4j.PropertyConfigurator

org.apache.log4j.PropertyConfigurator
Allows the configuration of log4j from an external file. See {@link #doConfigure(String,LoggerRepository)} for the expected format.
It is sometimes useful to see how log4j is reading configuration files. You can enable log4j internal logging by defining the log4j.debug variable.
As of log4j version 0.8.5, at class initialization time class, the file log4j.properties will be searched from the search path used to load classes. If the file can be found, then it will be fed to the {@link PropertyConfigurator#configure(java.net.URL)}method.
The PropertyConfigurator does not handle the advanced configuration features supported by the {@link org.apache.log4j.xml.DOMConfigurator DOMConfigurator} such assupport for {@link org.apache.log4j.spi.Filter Filters}, custom {@link org.apache.log4j.spi.ErrorHandler ErrorHandlers}, nested appenders such as the {@link org.apache.log4j.AsyncAppender AsyncAppender}, etc.
All option values admit variable substitution. The syntax of variable substitution is similar to that of Unix shells. The string between an opening "${" and closing "}" is interpreted as a key. The value of the substituted variable can be defined as a system property or in the configuration file itself. The value of the key is first searched in the system properties, and if not found there, it is then searched in the configuration file being parsed. The corresponding value replaces the ${variableName} sequence. For example, if java.home system property is set to /home/xyz, then every occurrence of the sequence ${java.home} will be interpreted as /home/xyz. @author Ceki Gülcü @author Anders Kristensen @since 0.8.1

    if(genericHierarchy == null) {
      File f = new File(dir, GENERIC+CONFIG_FILE_EXT);
      if(f.exists()) {
  genericHierarchy = new Hierarchy(new RootCategory(Priority.DEBUG));
  try {
    new PropertyConfigurator().doConfigure(f.toURL(),
                 genericHierarchy);
  } catch(MalformedURLException e) {
    cat.error("Could not convert"+f
        +" to a URL. Reverting to default hierarchy", e);    
    genericHierarchy = Category.getDefaultHierarchy();

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        // Check thr file name
        String filename = url.getFile().toLowerCase();
        if (filename.endsWith(".xml")) {
            return new DOMConfigurator();
        } else if (filename.endsWith(".properties")) {
            return new PropertyConfigurator();
        }


        // Check for <?xml in content
        if (connection != null) {
            try {
                BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                try {
                    String head = reader.readLine();
                    if (head.startsWith("<?xml")) {
                        return new DOMConfigurator();
                    }
                } finally {
                    reader.close();
                }
            } catch (IOException e) {
                log.warn("Failed to check content header; ignoring", e);
            }
        }


        log.warn("Unable to determine content type, using property configurator");
        return new PropertyConfigurator();
    }

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        // Check thr file name
        String filename = url.getFile().toLowerCase();
        if (filename.endsWith(".xml")) {
            return new DOMConfigurator();
        } else if (filename.endsWith(".properties")) {
            return new PropertyConfigurator();
        }


        // Check for <?xml in content
        if (connection != null) {
            try {
                BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                try {
                    String head = reader.readLine();
                    if (head.startsWith("<?xml")) {
                        return new DOMConfigurator();
                    }
                } finally {
                    reader.close();
                }
            } catch (IOException e) {
                log.warn("Failed to check content header; ignoring", e);
            }
        }


        log.warn("Unable to determine content type, using property configurator");
        return new PropertyConfigurator();
    }

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     if(configurator == null) {
       LogLog.error("Could not instantiate configurator ["+clazz+"].");
       return;
     }
   } else {
     configurator = new PropertyConfigurator();
   }


   configurator.doConfigure(url, hierarchy);
  }

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     if(configurator == null) {
       LogLog.error("Could not instantiate configurator ["+clazz+"].");
       return;
     }
   } else {
     configurator = new PropertyConfigurator();
   }


   configurator.doConfigure(url, hierarchy);
  }

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    @AfterClass public static void afterClassResetLogging() {
        // Unfortunately, this code "knows" how log4j was set up in testing
        // Thsi is fragile.
        URL configURL = Loader.getResource("log4j.properties");
        new PropertyConfigurator().doConfigure(configURL,
                                               LogManager.getLoggerRepository());
    }

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                {
                    waRootKey = LOG4J_CONFIG_WEB_APPLICATION_ROOT_KEY_DEFAULT;
                }
                p.setProperty(waRootKey,rootPath);
                isolatedHierarchy = new Hierarchy(new RootCategory(Level.INFO));
                new PropertyConfigurator().doConfigure(p,isolatedHierarchy);
                IsolatedLog4JLogger.setHierarchy(isolatedHierarchy);
                log = LogFactory.getLog(this.getClass());
                log.info("IsolatedLog4JLogger configured");
            }
            catch (IOException ioe)

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  } catch(NoClassDefFoundError e) {
    LogLog.warn("Could not find DOMConfigurator!", e);
    return;
  }
      } else {
  configurator = new PropertyConfigurator();
      }
    }


    configurator.doConfigure(url, hierarchy);
  }

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      File configFile = new File(dir, key+CONFIG_FILE_EXT);
      if(configFile.exists()) {
  Hierarchy h = new Hierarchy(new RootCategory(Priority.DEBUG));
  hierarchyMap.put(inetAddress, h);
  
  new PropertyConfigurator().doConfigure(configFile.getAbsolutePath(), h);


  return h;  
      } else {
  cat.warn("Could not find config file ["+configFile+"].");
  return genericHierarchy();

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  Hierarchy genericHierarchy() {
    if(genericHierarchy == null) {
      File f = new File(dir, GENERIC+CONFIG_FILE_EXT);
      if(f.exists()) {
  genericHierarchy = new Hierarchy(new RootCategory(Priority.DEBUG));
  new PropertyConfigurator().doConfigure(f.getAbsolutePath(), genericHierarchy);
      } else {
  cat.warn("Could not find config file ["+f+
     "]. Will use the default hierarchy.");
  genericHierarchy = Category.getDefaultHierarchy();
      }

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