src/main/java/org/apache/log4j/receivers/net/MulticastAppender.java [93:114]:
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  public void activateOptions() {
    try {
      hostname = InetAddress.getLocalHost().getHostName();
    } catch (UnknownHostException uhe) {
      try {
        hostname = InetAddress.getLocalHost().getHostAddress();
      } catch (UnknownHostException uhe2) {
        hostname = "unknown";
      }
    }

    //allow system property of application to be primary
    if (application == null) {
      application = System.getProperty(Constants.APPLICATION_KEY);
    } else {
      if (System.getProperty(Constants.APPLICATION_KEY) != null) {
        application = application + "-" + System.getProperty(Constants.APPLICATION_KEY);
      }
    }

    if(remoteHost != null) {
      address = getAddressByName(remoteHost);
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src/main/java/org/apache/log4j/receivers/net/UDPAppender.java [113:134]:
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  public void activateOptions() {
    try {
      hostname = InetAddress.getLocalHost().getHostName();
    } catch (UnknownHostException uhe) {
      try {
        hostname = InetAddress.getLocalHost().getHostAddress();
      } catch (UnknownHostException uhe2) {
        hostname = "unknown";
      }
    }

    //allow system property of application to be primary
    if (application == null) {
      application = System.getProperty(Constants.APPLICATION_KEY);
    } else {
      if (System.getProperty(Constants.APPLICATION_KEY) != null) {
        application = application + "-" + System.getProperty(Constants.APPLICATION_KEY);
      }
    }

    if(remoteHost != null) {
      address = getAddressByName(remoteHost);
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