Grails - creation of inheritor domain class - grails

Question

I have created two domain classes like below:
Component:
class Component {
String name;
Integer orderOfComponent;
Boolean limitedAccess;
Date dateCreated;
String alignment;
String type;
static belongsTo = [subpage: Subpage]
static constraints = {
name nullable: false, blank: false;
orderOfComponent nullable:false, blank: false;
limitedAccess nullable: true, blank: true;
alignment nullable: true, blank: true, inList: ["left", "right", "center", ""];
type nullable: false, blank: false, inList: ["text", "image", "document", "html"];
subpage nullable: false, blank: false;
}
}
Text:
class Text extends Component {
String text;
String color;
String additionalStyle;
String textType;
String link;
static constraints = {
text nullable: true, blank: true;
color nullable: true, blank: true;
additionalStyle nullable: true, blank: true;
textType nullable: true, blank: true, inList: ["p", "h1", "h2", "h3", ""];
link nullable: true, blank: true;
}
}
Everything is fine when I create instance of Component class:
new Component(name: "component" + i, orderOfComponent: i, limitedAccess: new Boolean(false), alignment: "right", type: "text", subpage: Subpage.get(1)).save(flush:true, failOnError:true);
But I get Error when I try to do similar for Text class:
new Text(name: "componentText",
orderOfComponent: 0,
limitedAccess: new Boolean(false),
alignment: "right",
type: "text",
subpage: Subpage.get(1),
text: "asdasdasdasd",
color: "#0F0C0A",
additionalStyle: "",
textType: "p",
link: "http://google.pl").save(flush:true, failOnError:true);
Error:
Error 2014-01-28 02:27:10,453 [localhost-startStop-1] ERROR context.GrailsContextLoader - Error initializing the application: Validation Error(s) occurred during save():
- Field error in object 'adminpanel.component.Text' on field 'type': rejected value [null]; (...)
And also very similar "Message".
Does someone know why I cannot create an instance of the Text class or how to use constructor of inheritor class properly? Thanks in advance.