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public class CollectorsTest {

@Test
public void collectorsTest() {
List params = Arrays.asList(
new AbstractMap.SimpleEntry("key1", 1),
new AbstractMap.SimpleEntry("key2", null)
);
Map paramMap = toParamMap(params); // throws NPE
}

private static Map toParamMap(List params) {
Map paramMap = params.stream().collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
return paramMap;
}
}