自定义Usertype不能更新的问题(特殊情况）

问题解决，是deepCopy方法没写好。

数据库是mysql5.0。
由于用户表有很多跟用户相关的数据，但是平时查询不作为条件使用，所以我设置了一个text字段Properties用于记录用户的一些信息，比如电话号码身份证等等。

public class ApplicationUserProperties implements Serializable
{
    private String identityName = null;

    private String identityCode = null;

    private boolean identityHidden = false;

    private boolean identityVeirified = false;

    private String phoneNumber = null;

    private boolean phoneNumberVerified = false;

    private boolean phoneNumberHidden = false;

    private String mobileNumber = null;

    private boolean mobileNumberVerified = false;

    private boolean mobileNumberHidden = false;

    /*---get and set methods--*/
}

写了一个自定义类型，用于把各个属性使用json方式存储，比如{"mobileNumber":1234567,“mobileNumber":false}

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;

import net.sf.json.JSONObject;

import org.hibernate.HibernateException;
import org.sothis.util.JsonUtils;

import com.bangyo.user.ApplicationUserProperties;

public class ApplicationUserPropertiesUserType extends AbstractMutableUserType
{
    private final static int[] SQL_TYPES =
    {
        Types.VARCHAR
    };

    public Object deepCopy(Object value) throws HibernateException
    {
        if (value==null)
            return null;

        return (ApplicationUserProperties)value;
    }

    public Object nullSafeGet(ResultSet rs, String[] names, Object owner)
        throws HibernateException, SQLException
    {
        if (rs.wasNull())
            return null;

        String props = rs.getString(names[0]);

        if (null==props)
            return null;

        ApplicationUserProperties properties = new ApplicationUserProperties();
        JsonUtils.toBean(properties, JSONObject.fromString(props));
        return properties;
    }

    public void nullSafeSet(PreparedStatement st, Object value, int index)
        throws HibernateException, SQLException
    {
        if (value==null)
        {
            st.setNull(index, Types.VARCHAR);
        }
        else
        {
            ApplicationUserProperties userInfo = (ApplicationUserProperties)value;
            Object jsonObject = JsonUtils.fromBean(userInfo);
            st.setString(index, jsonObject.toString());
        }
    }

    public Class<?> returnedClass()
    {
        return ApplicationUserProperties.class;
    }

    public int[] sqlTypes()
    {
        return SQL_TYPES;
    }
}

自定义类型的父类：

import java.io.Serializable;

import org.hibernate.HibernateException;
import org.hibernate.usertype.UserType;

public abstract class AbstractMutableUserType implements UserType
{
    public Object assemble(Serializable cached, Object owner)
        throws HibernateException
    {
        return deepCopy(cached);
    }

    public Serializable disassemble(Object value) throws HibernateException
    {
        return (Serializable)deepCopy(value);
    }

    public boolean equals(Object x, Object y) throws HibernateException
    {
        if (x==y)
            return true;
        if (x==null||y==null)
            return false;
        return x.equals(y);
    }

    public int hashCode(Object x) throws HibernateException
    {
        if (x==null)
            return 0;

        return x.hashCode();
    }

    public Object replace(Object original, Object target, Object owner)
        throws HibernateException
    {
        return deepCopy(original);
    }

    public boolean isMutable()
    {
        return true;
    }
}

ApplicationUser.hbm.xml中的引用

        <property name="properties" column="Properties"
            type="ApplicationUserPropertiesUserType"
            not-null="false" />

接着问题就是，insert操作的时候这个字段的值可以被插入，但是update操作的时候，这个值无论怎么设都无法更新，似乎是hibernate不知道这个值被更新了。
更新时的代码

        applicationUser.setGender(Gender.MALE);

        applicationUser.getProperties().setLastProductPoin(product.getPoin());
        applicationUser.getProperties().setLastProductTitle(product.getTitle());
        applicationUser.getProperties().setLastProductTagRootPoin(
            product.getTagRootPoin());
        applicationUser.getProperties()
            .setLastProductTagRootTitle(tagRootTitle);
        applicationUser.getProperties().setLastProductDateTime(
            "2007-01-01 11:00:00");
        applicationUserPersister.update(applicationUser);

其他类型可以，比如性别的，直接user.setGender(Gender.MALE),接着update就可以更新，可是上面那个就是不行，请大家帮我看看是为什么。谢谢