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

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

@@ -10,7 +10,7 @@ import io.ebeaninternal.api.NaturalKeyQueryData;
 abstract class NonPrepareExpression implements SpiExpression {
 
   @Override
-  public boolean naturalKey(NaturalKeyQueryData data) {
+  public boolean naturalKey(NaturalKeyQueryData<?> data) {
     // can't use naturalKey cache
     return false;
   }