Warnings (wrt JDK 11) cleanup

Author: cowtowncoder

src/test/java/com/fasterxml/jackson/databind/deser/creators/TestCreators.java

@@ -315,7 +315,7 @@ public void testNoArgsFactory() throws Exception
 
     public void testSimpleDoubleConstructor() throws Exception
     {
-        Double exp = new Double("0.25");
+        Double exp = Double.valueOf("0.25");
         DoubleConstructorBean bean = MAPPER.readValue(exp.toString(), DoubleConstructorBean.class);
         assertEquals(exp, bean.d);
     }

src/test/java/com/fasterxml/jackson/databind/deser/creators/TestValueInstantiator.java

@@ -128,7 +128,7 @@ public CreatorProperty[] getFromObjectArguments(DeserializationConfig config) {
         public Object createFromObjectWith(DeserializationContext ctxt, Object[] args) {
             try {
                 Class<?> cls = (Class<?>) args[0];
-                return cls.newInstance();
+                return cls.getDeclaredConstructor().newInstance();
             } catch (Exception e) {
                 throw new RuntimeException(e);
             }

src/test/java/com/fasterxml/jackson/databind/jsontype/deftyping/TestDefaultForScalars.java

@@ -17,7 +17,7 @@ public class TestDefaultForScalars
 {
     static class Jackson417Bean {
         public String foo = "bar";
-        public java.io.Serializable bar = new Integer(13);
+        public java.io.Serializable bar = Integer.valueOf(13);
     }
 
     // [databind#1395]: prevent attempts at including type info for primitives

src/test/java/com/fasterxml/jackson/failing/TestUnknownProperty426.java

@@ -18,7 +18,7 @@ static class User {
         public void setUserId(CharSequence id) {
             // 21-Dec-2015, tatu: With a fix in 2.7, use of String would not
             //   trigger the problem, so use CharSequence...
-            setUserId(new Integer(id.toString()));
+            setUserId(Integer.valueOf(id.toString()));
         }
 
         public Integer getUserId() {