do not strip generic type from Class (#3445)

Co-authored-by: judas <[email protected]>

Author: kostislav

src/main/java/com/fasterxml/jackson/databind/type/TypeFactory.java

@@ -104,14 +104,6 @@ public class TypeFactory // note: was final in 2.9, removed from 2.10
      */
     protected final static SimpleType CORE_TYPE_ENUM = new SimpleType(CLS_ENUM);
 
-    /**
-     * Cache {@link Class} because it is nominally parametric, but has no really
-     * useful information.
-     *
-     * @since 2.7
-     */
-    protected final static SimpleType CORE_TYPE_CLASS = new SimpleType(CLS_CLASS);
-
     /**
      * Cache {@link JsonNode} because it is no critical path of simple tree model
      * reading and does not have things to override
@@ -1594,9 +1586,6 @@ protected JavaType _fromParamType(ClassStack context, ParameterizedType ptype,
         if (rawType == CLS_COMPARABLE) {
             return CORE_TYPE_COMPARABLE;
         }
-        if (rawType == CLS_CLASS) {
-            return CORE_TYPE_CLASS;
-        }
 
         // First: what is the actual base type? One odd thing is that 'getRawType'
         // returns Type, not Class<?> as one might expect. But let's assume it is

src/test/java/com/fasterxml/jackson/databind/type/TestTypeFactory.java

@@ -660,4 +660,15 @@ public void testRawMapType()
         assertNotNull(type);
         assertEquals(Wrapper1297.class, type.getRawClass());
     }
+
+    // for [databind#3443]
+    public void testParameterizedClassType() {
+        TypeFactory tf = TypeFactory.defaultInstance();
+
+        JavaType t = tf.constructType(new TypeReference<Class<? extends CharSequence>>() { });
+
+        assertEquals(SimpleType.class, t.getClass());
+        assertEquals(1, t.containedTypeCount());
+        assertEquals(CharSequence.class, t.containedType(0).getRawClass());
+    }
 }