Add missing javadoc/tests for some null arguments (#869)

src/main/java/org/apache/commons/lang3/ArrayUtils.java

@@ -3772,6 +3772,7 @@ public class ArrayUtils {
      * @param comparator the {@link Comparator} to compare over
      * @param <T> the datatype of the array
      * @return whether the array is sorted
+     * @throws NullPointerException if {@code comparator} is {@code null}
      * @since 3.4
      */
     public static <T> boolean isSorted(final T[] array, final Comparator<T> comparator) {

src/main/java/org/apache/commons/lang3/Range.java

@@ -274,6 +274,7 @@ public class Range<T> implements Serializable {
      *
      * @param element  the element to check for, not null
      * @return -1, 0 or +1 depending on the element's location relative to the range
+     * @throws NullPointerException if {@code element} is {@code null}
      */
     public int elementCompareTo(final T element) {
         // Comparable API says throw NPE on null
@@ -329,6 +330,7 @@ public class Range<T> implements Serializable {
      * </pre>
      * @param element the element to check for, not null
      * @return the minimum, the element, or the maximum depending on the element's location relative to the range
+     * @throws NullPointerException if {@code element} is {@code null}
      * @since 3.10
      */
     public T fit(final T element) {

src/main/java/org/apache/commons/lang3/builder/ToStringBuilder.java

@@ -907,6 +907,7 @@ public class ToStringBuilder implements Builder<String> {
      *
      * @param srcObject  the {@link Object} whose class name and id to output
      * @return this
+     * @throws NullPointerException if {@code srcObject} is {@code null}
      * @since 2.0
      */
     public ToStringBuilder appendAsObjectToString(final Object srcObject) {

src/main/java/org/apache/commons/lang3/reflect/TypeUtils.java

@@ -1543,6 +1543,7 @@ public class TypeUtils {
      * @param rawClass the raw class to create a parameterized type instance for
      * @param typeVariableMap the map used for parameterization
      * @return {@link ParameterizedType}
+     * @throws NullPointerException if either {@code rawClass} or {@code typeVariableMap} is {@code null}
      * @since 3.2
      */
     public static final ParameterizedType parameterize(final Class<?> rawClass,
@@ -1559,6 +1560,7 @@ public class TypeUtils {
      * @param rawClass the raw class to create a parameterized type instance for
      * @param typeArguments the types used for parameterization
      * @return {@link ParameterizedType}
+     * @throws NullPointerException if {@code rawClass} is {@code null}
      * @since 3.2
      */
     public static final ParameterizedType parameterize(final Class<?> rawClass, final Type... typeArguments) {
@@ -1607,6 +1609,8 @@ public class TypeUtils {
      * @param rawClass the raw class to create a parameterized type instance for
      * @param typeVariableMap the map used for parameterization
      * @return {@link ParameterizedType}
+     * @throws NullPointerException if either {@code rawClass} or {@code typeVariableMap}
+     *  is {@code null}
      * @since 3.2
      */
     public static final ParameterizedType parameterizeWithOwner(final Type owner, final Class<?> rawClass,
@@ -1625,6 +1629,7 @@ public class TypeUtils {
      * @param typeArguments the types used for parameterization
      *
      * @return {@link ParameterizedType}
+     * @throws NullPointerException if {@code rawClass} is {@code null}
      * @since 3.2
      */
     public static final ParameterizedType parameterizeWithOwner(final Type owner, final Class<?> rawClass,

src/test/java/org/apache/commons/lang3/builder/ToStringBuilderTest.java

@@ -609,6 +609,13 @@ public class ToStringBuilderTest extends AbstractLangTest {
                 new ToStringBuilder(base).appendAsObjectToString(objectToAppend3).toString());
     }
 
+    @Test
+    public void testAppendAsObjectToStringNullPointerException() {
+        ToStringBuilder builder = new ToStringBuilder(1);
+        assertThrows(NullPointerException.class, () -> builder.appendAsObjectToString(null));
+        builder.toString();
+    }
+
     @Test
     public void testAppendBooleanArrayWithFieldName() {
         final boolean[] array = { true, false, false };

src/test/java/org/apache/commons/lang3/reflect/TypeUtilsTest.java

@@ -20,6 +20,7 @@ import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.awt.Insets;
@@ -947,6 +948,18 @@ public class TypeUtilsTest<B> extends AbstractLangTest {
         assertEquals(TypeUtils.parameterize(ArrayList.class, String.class), unrolled);
     }
 
+    @Test
+    public void testParameterizeNullPointerException() {
+        assertThrows(NullPointerException.class, () -> TypeUtils.parameterize(null, Collections.emptyMap()));
+        final Map<TypeVariable<?>, Type> nullTypeVariableMap = null;
+        assertThrows(NullPointerException.class, () -> TypeUtils.parameterize(String.class, nullTypeVariableMap));
+    }
+
+    @Test
+    public void testParameterizeVarArgsNullPointerException() {
+        assertThrows(NullPointerException.class, () -> TypeUtils.parameterize(null));
+    }
+
     @Test
     public void testParameterizeWithOwner() throws Exception {
         final Type owner = TypeUtils.parameterize(TypeUtilsTest.class, String.class);
@@ -954,6 +967,20 @@ public class TypeUtilsTest<B> extends AbstractLangTest {
         assertTrue(TypeUtils.equals(getClass().getField("dat2").getGenericType(), dat2Type));
     }
 
+    @Test
+    public void testParameterizeWithOwner3ArgsNullPointerException() {
+        final Type owner = TypeUtils.parameterize(TypeUtilsTest.class, String.class);
+        assertThrows(NullPointerException.class, () -> TypeUtils.parameterizeWithOwner(owner, null, String.class));
+        final Map<TypeVariable<?>, Type> nullTypeVariableMap = null;
+        assertThrows(NullPointerException.class, () -> TypeUtils.parameterizeWithOwner(owner, That.class, nullTypeVariableMap));
+    }
+
+    @Test
+    public void testParameterizeWithOwnerVarArgsNullPointerException() {
+        final Type owner = TypeUtils.parameterize(TypeUtilsTest.class, String.class);
+        assertThrows(NullPointerException.class, () -> TypeUtils.parameterizeWithOwner(owner, null));
+    }
+
     @Test
     public void testToLongString() {
         assertEquals(getClass().getName() + ":B", TypeUtils.toLongString(getClass().getTypeParameters()[0]));

src/test/java/org/apache/commons/lang3/time/DurationUtilsTest.java

@@ -143,6 +143,11 @@ public class DurationUtilsTest extends AbstractLangTest {
         assertEquals(Integer.MAX_VALUE, DurationUtils.toMillisInt(Duration.ofNanos(Long.MAX_VALUE)));
     }
 
+    @Test
+    public void testToMillisIntNullDuration() {
+        assertThrows(NullPointerException.class, () -> DurationUtils.toMillisInt(null));
+    }
+
     @Test
     public void testZeroIfNull() {
         assertEquals(Duration.ZERO, DurationUtils.zeroIfNull(null));