src/main/java/org/apache/log4j/xml/UtilLoggingXMLDecoder.java [403:440]:
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            if (additionalProperties.size() > 0) {
                if (properties == null) {
                    properties = new Hashtable(additionalProperties);
                }
                for (Object o : additionalProperties.entrySet()) {
                    Map.Entry e = (Map.Entry) o;
                    properties.put(e.getKey(), e.getValue());
                }
            }

            LocationInfo info;
            if ((fileName != null)
                || (className != null)
                || (methodName != null)
                || (lineNumber != null)) {
                info = new LocationInfo(fileName, className, methodName, 
                        Integer.parseInt(lineNumber));
            } else {
                info = null;
            }

//            ThrowableInformation throwableInfo = null;
//            if (exception != null) {
//                throwableInfo = new ThrowableInformation(exception);
//            }

            builder.clear();
            builder.setLogger(logger)
                    .setTimestamp(Instant.ofEpochMilli(timeStamp))
                    .setLevelFromString(level)
                    .setMessage(message)
                    .setThreadName(threadName)
                    .setMDC(properties)
                    .setNDC(ndc)
                    .setLocationInfo(info);


            events.add(builder.create());
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src/main/java/org/apache/log4j/xml/XMLDecoder.java [420:457]:
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                if (additionalProperties.size() > 0) {
                    if (properties == null) {
                        properties = new Hashtable(additionalProperties);
                    }
                    for (Object o : additionalProperties.entrySet()) {
                        Map.Entry e = (Map.Entry) o;
                        properties.put(e.getKey(), e.getValue());
                    }
                }
            }

            LocationInfo info;
            if ((fileName != null)
                || (className != null)
                || (methodName != null)
                || (lineNumber != null)) {
                info = new LocationInfo(fileName, className, methodName, 
                        Integer.parseInt(lineNumber));
            } else {
                info = null;
            }
//            ThrowableInformation throwableInfo = null;
//            if (exception != null) {
//                throwableInfo = new ThrowableInformation(exception);
//            }

            builder.clear();
            builder.setLogger(logger)
                    .setTimestamp(Instant.ofEpochMilli(timeStamp))
                    .setLevelFromString(level)
                    .setMessage(message)
                    .setThreadName(threadName)
                    .setMDC(properties)
                    .setNDC(ndc)
                    .setLocationInfo(info);


            events.add(builder.create());
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