Spring: metodo onSubmit() não é chamdo na submissão do formulário

public class CategoryValidator implements Validator{

	@Override
	public boolean supports(Class clazz) {
		return Category.class.equals(clazz);
	}

	@Override
	public void validate(Object obj, Errors errors) {
	   	System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> validate()");
		Category category = (Category) obj;
        if (category == null) {
            errors.rejectValue("name", "error.not-specified", null, "Value required.");
        }
	}
}

@Override
	protected void onBindAndValidate(HttpServletRequest request,
			Object command, BindException errors) throws Exception {
	 	System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> onBindAndValidate()");
		Category category = (Category) command;
        if (category == null) {
            errors.rejectValue("name", "error.not-specified", null, "Value required.");
        }
	}

@Entity
@Table(name = "category", schema = "public")
public class Category implements java.io.Serializable {
	private static final long serialVersionUID = -6908769737731206565L;

	private Long id;
	private Category category;
	private String name;
	private Set<Category> categories = new HashSet<Category>(0);
	private Set<Product> products = new HashSet<Product>(0);

	public Category() {
	}

	public Category(String name) {
		this.name = name;
	}

	public Category(Category category, String name, Set<Category> categories,
			Set<Product> products) {
		this.category = category;
		this.name = name;
		this.categories = categories;
		this.products = products;
	}

	@SequenceGenerator(name = "generator", sequenceName = "seq_category", allocationSize=1)
	@Id
	@GeneratedValue(strategy = SEQUENCE, generator = "generator")
	@Column(name = "id", unique = true, nullable = false)
	public Long getId() {
		return this.id;
	}

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

	@ManyToOne(fetch = FetchType.LAZY)
	@JoinColumn(name = "parent_id")
	public Category getCategory() {
		return this.category;
	}

	public void setCategory(Category category) {
		this.category = category;
	}

	@Column(name = "name", nullable = false, length = 30)
	public String getName() {
		return this.name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@OneToMany(fetch = FetchType.LAZY, mappedBy = "category")
	public Set<Category> getCategories() {
		return this.categories;
	}

	public void setCategories(Set<Category> categories) {
		this.categories = categories;
	}

	@OneToMany(fetch = FetchType.LAZY, mappedBy = "category")
	public Set<Product> getProducts() {
		return this.products;
	}

	public void setProducts(Set<Product> products) {
		this.products = products;
	}

}

<bean name="/categoryForm.htm" class="com.braview.sbce.controller.CategoryFormController">  
     <property name="sessionForm" value="true"/>  
     <property name="commandName" value="category"/>  
     <property name="commandClass" value="com.braview.sbce.dataaccess.entity.Category"/>  
     <property name="validator">  
         <bean class="com.braview.sbce.validator.CategoryValidator"/>  
     </property>  
     <property name="formView" value="categoryForm"/>  
     <property name="successView" value="hello.htm"/>  
     <property name="categoryDAO" ref="categoryDAO"/>   
     <property name="propertyEditorRegistrars">
         <list>
              <ref bean="categoryEditor"/>
         </list>
     </property>
 </bean>

<bean id="categoryEditor" class="com.sistema.editores.CategoryEditor"/>

public class CategoryEditor extends PropertyEditorSupport implements PropertyEditorRegistrar {

    private CategoryDAO categoryDAO; 

    public void setAsText(final String value) {
    	if(	(value == null) ||
    		(value.equals("0"))	){
            super.setValue(null);
    	} else {
            try {
            	Category category = this.categoryDAO.get(value);
                super.setValue(category);
            } catch (final Exception e) {
                super.setValue(null);
            }
    	}

    }

    @Override
    public String getAsText() {
    	Category category = (Category) this.getValue();

    	if(	(category == null) ||
    		(category.getId() == null)	){
    		return super.getAsText();
    	} else {
        	return category.getId().toString();
    	}

    }

	public void registerCustomEditors(PropertyEditorRegistry propertyEditorRegistry) {
		propertyEditorRegistry.registerCustomEditor(Category.class, this);
	}

}