zookeeper-contrib/zookeeper-contrib-loggraph/src/main/java/org/apache/zookeeper/graph/Log4JSource.java [240:247]:
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    public LogIterator iterator(long starttime, long endtime) throws IllegalArgumentException {
	try {
	    return iterator(starttime, endtime, null);
	} catch (FilterException fe) {
	    assert(false); //"This should never happen, you can't have a filter exception without a filter");
	    return null;
	}
    }
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zookeeper-contrib/zookeeper-contrib-loggraph/src/main/java/org/apache/zookeeper/graph/TxnLogSource.java [275:282]:
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    public LogIterator iterator(long starttime, long endtime) throws IllegalArgumentException {
	try {
	    return iterator(starttime, endtime, null);
	} catch (FilterException fe) {
	    assert(false); // should never ever happen
	    return null;
	}
    }
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