log4j-core/src/main/java/org/apache/logging/log4j/core/impl/MutableLogEvent.java [369:378]:
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    public StackTraceElement getSource() {
        if (source != null) {
            return source;
        }
        if (loggerFqcn == null || !includeLocation) {
            return null;
        }
        source = StackLocatorUtil.calcLocation(loggerFqcn);
        return source;
    }
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log4j-core/src/main/java/org/apache/logging/log4j/core/impl/Log4jLogEvent.java [689:698]:
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    public StackTraceElement getSource() {
        if (source != null) {
            return source;
        }
        if (loggerFqcn == null || !includeLocation) {
            return null;
        }
        source = StackLocatorUtil.calcLocation(loggerFqcn);
        return source;
    }
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