Question

I’m struggling to make this work but with no luck.

Below is sample code and when I call edit method in the jsp all values are filled, but when I want to save changes then get an exception in OGNL.
Maybe stuts2 doesn’t work well with generics. Any suggestion would be more than appreciated.

public abstract class ActionHelper<T> extends ActionSupport{

    protected T entity;
    protected Integer id;

    public void setId(Integer id){
        this.id=id;
    }

    public void setEntity(T entity){
        this.entity=entity;
    }

    public void getEntity(T entity){
        this.entity=entity;
    }

    public String edit(){
        this.entity=fillEntity();
        return "edit";
    }
    public String save(){
        genericDao.save(entity);

    }
    protected abstract T fillEntity();
}

public class PersonAction extends ActionHelper<Person>{
    Person fillEntity(){
        return genericDao.find(id,Person.class);   
    }
}

<s:form action="person_save" method="post">
<s:hidden name="entity.id">
<s:textfield name="entity.name">
<s:textfield name="entity.surname">
</form>

Answer 1

The start tag of the form is: s:form but the end tag is just an html form tag… probably a typo?

You’re using a default access specifier for fillEntity and not following java been naming conventions, try this:

public Person getEntity(){
    return genericDao.find(id,Person.class);   
}

Now OGNL will be able to find “entity” in PersonAction.