src/main/java/org/apache/log4j/receivers/net/MulticastAppender.java [224:231]:
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  InetAddress getAddressByName(String host) {
    try {
      return InetAddress.getByName(host);
    } catch (Exception e) {
      LogLog.error("Could not find address of [" + host + "].", e);
      return null;
    }
  }
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src/main/java/org/apache/log4j/receivers/net/UDPAppender.java [248:255]:
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  InetAddress getAddressByName(String host) {
    try {
      return InetAddress.getByName(host);
    } catch (Exception e) {
      LogLog.error("Could not find address of [" + host + "].", e);
      return null;
    }
  }
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