Hello guys, I am a newbie in Hibernate.
Currently I am facing with such problem:

I have such bean:

public class DbInstance {

private String name = null;

private String guid = null;

public DbInstance() {
}

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

public String getGuid() {
return guid;
}

public void setGuid(String guid) {
this.guid = guid;
}

public String getName() {
return name;
}

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

@Override
public String toString() {
return "DbInstance [name=" + name + "]";
}

}

mapping:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="***">
<class name="DbInstance" table="Admin_DatabaseInstance">
<id name="guid" column="DatabaseInstanceId">
<generator class="guid"/>
</id>
<property name="name" />
</class>
</hibernate-mapping>

I want to map mentioned class to already existed table in data base.
I can't modify schema of the database.

Table script:

USE [CMTAdmin]
GO
/****** Object: Table [dbo].[Admin_DatabaseInstance] Script Date: 10/05/2009 14:24:33 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Admin_DatabaseInstance](
[DatabaseInstanceId] [uniqueidentifier] ROWGUIDCOL NOT NULL,
[Name] [nvarchar](50) NOT NULL,
[InstancePreferences] [ntext] NOT NULL,
[PublisherInsName] [ntext] NULL,
[PublisherAdminInsName] [ntext] NULL,
CONSTRAINT [PK_DatabaseInstance] PRIMARY KEY CLUSTERED
(
[DatabaseInstanceId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]


The problem is, when I try to get all records of the DbInstance (for this I have created simple DAO class) I get an exception:

Initial SessionFactory creation failed.org.hibernate.HibernateException: Wrong column type in CMTAdmin.dbo.Admin_DatabaseInstance for column DatabaseInstanceId. Found: uniqueidentifier, expected: varchar(255)

So, there is a problem in mapping of SQL SERVER 2005 uniqueidentifier data type to Java String.
Also tried to use UUID -- outcome is the same.

I need a tip - what could be wrong in this situation, any help will be appreciated.
Thanks a lot.