src/main/java/org/apache/sling/commons/log/logback/internal/MaskingMessageUtil.java [222:229]:
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        @Override
        public void process(Context context, Converter<ILoggingEvent> head) {
            if (head == null) {
                // this should never happen
                throw new IllegalArgumentException("cannot process empty chain");
            }
            if (!chainHandlesThrowable(head)) {
                Converter<ILoggingEvent> tail = ConverterUtil.findTail(head);
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src/main/java/org/apache/sling/commons/log/logback/internal/stacktrace/OSGiAwareExceptionHandling.java [45:52]:
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    @Override
    public void process(Context context, Converter<ILoggingEvent> head) {
        if (head == null) {
            // this should never happen
            throw new IllegalArgumentException("cannot process empty chain");
        }
        if (!chainHandlesThrowable(head)) {
            Converter<ILoggingEvent> tail = ConverterUtil.findTail(head);
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