提交Set集合出错? 400 报错

提交Set集合出错? 400 报错

package oshop.entity;

import java.util.Set;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

/**
 * 产品品牌
 * 
 * @author sky
 * 
 */
@Entity
@org.hibernate.annotations.Entity(dynamicUpdate = true)
@Table(name = "brand")
public class Brand extends BaseEntity {

    /**
	 * 
	 */
    private static final long serialVersionUID = -982632398252926845L;
    /**
     * 产品类型
     */

    private Set<ProductType> productTypes;
    private String name;
    private String siteUrl;

    @Column(unique = true, nullable = false)
    public String getName() {
        return name;
    }

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

    public String getSiteUrl() {
        return siteUrl;
    }

    public void setSiteUrl(String siteUrl) {
        this.siteUrl = siteUrl;
    }

    @ManyToMany(fetch = FetchType.LAZY)
    public Set<ProductType> getProductTypes() {
        return productTypes;
    }

    public void setProductTypes(Set<ProductType> productTypes) {
        this.productTypes = productTypes;
    }

}

package oshop.entity;

import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;

/**
 * 产品类型
 * 
 * @author sky
 * 
 */
@Entity
@Table(name = "product_type")
public class ProductType extends BaseEntity {

    private static final long serialVersionUID = 4500336342773347538L;

    private ProductCategory parentCategory; // 商品分类

    private String name;// 商品类型名称

    private Set<ProductTypeAttribute> productTypeAttributes; // 商品属性

    private Set<Brand> brands;// 商品类型可选的品牌

    private String priceRange;// 价格区间

    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    public ProductCategory getParentCategory() {
        return parentCategory;
    }

    public void setParentCategory(ProductCategory parentCategory) {
        this.parentCategory = parentCategory;
    }

    @Column(nullable = false)
    public String getName() {
        return name;
    }

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

    @OneToMany(cascade = CascadeType.REMOVE, fetch = FetchType.LAZY, mappedBy = "productType")
    public Set<ProductTypeAttribute> getProductTypeAttributes() {
        return productTypeAttributes;
    }

    public void setProductTypeAttributes(
            Set<ProductTypeAttribute> productTypeAttributes) {
        this.productTypeAttributes = productTypeAttributes;
    }

    public String getPriceRange() {
        return priceRange;
    }

    public void setPriceRange(String priceRange) {
        this.priceRange = priceRange;
    }

    @ManyToMany(fetch = FetchType.LAZY)
    public Set<Brand> getBrands() {
        return brands;
    }

    public void setBrands(Set<Brand> brands) {
        this.brands = brands;
    }

}

<tr>
	<th class="label">可选品牌：</th>
	<td><#if (brandList?size > 0)> <#list brandList as brand>
		<ul class="checkboxList">
		<li>
<input id="brand_${brand.id}" type="checkbox" name="productType.brands.makeNew[${brand_index}].id" value="${brand.id}" />
<label for="brand_${brand.id}" title="${(brand.siteUrl)!}">
${brand.name}
</label>
</li>
</ul>
</#list> </#if>
	<div class="cb"></div>
	</td>
</tr>

properites:

KeyProperty_brands=id
Element_brands=oshop.entity.Brand
CreateIfNull_brands=true

提交表单报错是：

2011-3-11 10:37:58 com.opensymphony.xwork2.util.logging.commons.CommonsLogger warn
警告: Error setting expression 'productType.brands.makeNew[0].id' with value '[Ljava.lang.String;@472ebf9a'
ognl.OgnlException: Error getting property descriptor: null
    at com.opensymphony.xwork2.ognl.accessor.XWorkCollectionPropertyAccessor.getProperty(XWorkCollectionPropertyAccessor.java:126)
    at com.opensymphony.xwork2.ognl.accessor.XWorkListPropertyAccessor.getProperty(XWorkListPropertyAccessor.java:80)

找了一上午了，网上说要写properties文件和makeNew也写了。就是提交不上去。Set new 过了也是这个错误。Brand里面有getId,setId