[Xdoclet-user] Exception "Composite ID property of type void is invalid. It has to be serializable and reimplement equals(Object)"

[Fenderbosch, Eric]

I'm getting an "xdoclet.XDocletException: Composite ID property of type void is 
invalid. It has to be serializable and reimplement equals(Object)" on this object 
graph.  I can't figure out why.  CategoryState extends State, which has an Identity.  
Identity is Serializable and its concrete sub-classes do implement equals and 
hashCode.  Specifically, CategoryState's Identity is the concrete sub-class 
CategoryIdentity.  I specify the hibernate id tag on the setId() method.  I've 
simplified my classes quite a bit, but here's the code.  Any help would be 
appreciated.  If I use my manually created mapping.xml, everything works correctly, so 
it isn't a Hibernate issue.


public abstract class Identity implements Serializable {  
    public abstract boolean equals(Object obj);
    public abstract int hashCode();
    public abstract String toString();
}

public abstract class State implements Serializable {
    protected Identity id;

    public Identity getId() {
        return id;
    }

    public abstract void setId(Identity identity);
    public abstract String toString();
}

public class CategoryIdentity extends Identity {
    private String categoryCode;

    public CategoryIdentity() {
    }

    public CategoryIdentity(String categoryCode) {
        this.categoryCode = categoryCode;
    }

    /**
     * @hibernate.property
     *     column="category_code"
     *     type="com.*****.cc.hibernate.type.TrimStringType"
     *     length="2"
     */
    public String getCategoryCode() {
        return categoryCode;
    }

    public void setCategoryCode(String categoryCode) {
        this.categoryCode = categoryCode;
    }

    public boolean equals(Object obj) {
        if (obj instanceof CategoryIdentity) {
            CategoryIdentity other = (CategoryIdentity) obj;
            return (categoryCode.equals(other.categoryCode);
        } else {
            return false;
        }
    }
    
    public int hashCode() {
        return categoryCode.hashCode();
    }

    public String toString() {
        return categoryCode;
    }
}

/**
 * @hibernate.class
 *     table="category"
 *     schema="ias"
 */
public class CategoryState extends State {
    private String description;

    public CategoryState() {
        id = new CategoryIdentity();
    }

    public CategoryState(CategoryIdentity identity) {
        id = identity;
    }

    public String getCategoryCode() {
        return ((CategoryIdentity) id).getCategoryCode();
    }

    /**
     * @hibernate.property
     *     column="description"
     *     type="com.*****.cc.hibernate.type.TrimStringType"
     *     length="50" 
     */
    public String getDescription() {
        return description;
    }

    public void setCategoryCode(String categoryCode) {
        ((CategoryIdentity) id).setCategoryCode(categoryCode);
    }

    public void setDescription(String description) {
        this.description = description;
    }

    /**
     * @hibernate.id
     *     column="id"
     *     type="com.*****.cc.objectlib.CategoryIdentity"
     *     unsaved-value="null"
     *     generator-class="assigned"
     */
    public void setId(Identity identity) {
        if (identity instanceof CategoryIdentity) {
            id = identity;
        }
    }

    public String toString() {
        StringBuffer temp = new StringBuffer();
        temp
            .append(id)
            .append(" description=")
            .append(description)
        return temp.toString();
    }
}


Eric



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