No effective code change: Fixwarnings, overrides, generics etc. (#1285)

src/main/java/io/ebeaninternal/server/expression/NestedPathWrapperExpression.java

@@ -25,7 +25,7 @@ class NestedPathWrapperExpression implements SpiExpression {
   }
 
   @Override
-  public boolean naturalKey(NaturalKeyQueryData data) {
+  public boolean naturalKey(NaturalKeyQueryData<?> data) {
     // can't use naturalKey cache
     return false;
   }