Commit 2e667a32 authored by R.W.Majeed's avatar R.W.Majeed
Browse files

more verbose NPE

parent 53a3967d
......@@ -10,6 +10,7 @@ import java.time.Instant;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.function.Function;
import java.util.logging.Logger;
......@@ -168,6 +169,7 @@ public class I2b2ExtractorFactory implements AutoCloseable, ObservationExtractor
Iterator<Visit> vi = vl.iterator();
for( int i=0; i<nums.length; i++ ){
Visit v =;
Objects.requireNonNull(v, "null visit in argument list");
int num;
if( v instanceof I2b2Visit ){
num = ((I2b2Visit) v).getNum();
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