[COLLECTIONS-692] Replace use of deprecated Class#newInstance() #49.

src/changes/changes.xml

@@ -27,6 +27,9 @@
     <action issue="COLLECTIONS-689" dev="ggregory" type="update" due-to="Richard Walker">
       Link to Javadoc API broken.
     </action>
+    <action issue="COLLECTIONS-692" dev="ggregory" type="update" due-to="Gary Gregory, ">
+      Replace use of deprecated Class#newInstance() #49.
+    </action>
   </release>
   <release version="4.2" date="2018-07-11" description="Update from Java 6 to Java 7, bug fixes, and small changes.">
     <action issue="COLLECTIONS-681" dev="kinow" type="add" due-to="Stephan Fuhrmann">

src/main/java/org/apache/commons/collections4/list/SetUniqueList.java

@@ -16,6 +16,8 @@
  */
 package org.apache.commons.collections4.list;
 
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashSet;
@@ -327,21 +329,20 @@ public class SetUniqueList<E> extends AbstractSerializableListDecorator<E> {
      * @return a new {@link Set} populated with all elements of the provided
      *   {@link List}
      */
-    @SuppressWarnings("unchecked")
     protected Set<E> createSetBasedOnList(final Set<E> set, final List<E> list) {
         Set<E> subSet;
         if (set.getClass().equals(HashSet.class)) {
             subSet = new HashSet<>(list.size());
         } else {
             try {
-                subSet = set.getClass().newInstance();
-            } catch (final InstantiationException ie) {
-                subSet = new HashSet<>();
-            } catch (final IllegalAccessException iae) {
+                subSet = set.getClass().getDeclaredConstructor(set.getClass()).newInstance(set);
+            } catch (final InstantiationException
+                    | IllegalAccessException
+                    | InvocationTargetException
+                    | NoSuchMethodException ie) {
                 subSet = new HashSet<>();
             }
         }
-        subSet.addAll(list);
         return subSet;
     }
 

src/main/java/org/apache/commons/collections4/map/MultiValueMap.java

@@ -560,7 +560,7 @@ public class MultiValueMap<K, V> extends AbstractMapDecorator<K, Object> impleme
         @Override
         public T create() {
             try {
-                return clazz.newInstance();
+                return clazz.getDeclaredConstructor().newInstance();
             } catch (final Exception ex) {
                 throw new FunctorException("Cannot instantiate class: " + clazz, ex);
             }