i encountered an strange problem , i have degubed many times but i cannot deal with it.

why it always says duplicate import: CosmeticBrand
(a class to be pesisted!) when i use the hibernat.cfg.xml and Configuration().configure() to initialze
but when i tried to use Configuration.add(CosmeticBrand.class).add(Product).add(ProductProfile) to initialize instead , no exception was thrown and it could aslo export correct schema!

hibernate.cfg.xml
<hibernate-configuration>
<session-factory>
<mapping resource="com/sirius/webapps/shoppingmall/products/entity/brand/CosmeticBrand.hbm.xml"/>
<mapping resource="com/sirius/webapps/shoppingmall/products/entity/product/CosmeticProduct.hbm.xml"/>
<mapping resource="com/sirius/webapps/shoppingmall/products/ProductProfile.hbm.xml"/>
</session-factory>
</hibernate-configuration>

CosmeticProduct.hbm.xml
here is some xmls
<?xml version="1.0"?>

<hibernate-mapping>
<class
name="com.sirius.webapps.shoppingmall.products.CosmeticProduct"
table="Cosmetic_Products"
dynamic-update="false"
>
<id
name="productID"
column="productID"
type="string"
unsaved-value="any"
>
<generator class="assigned"/>
</id>

<property
name="productName"
type="string"
update="true"
insert="true"
column="Productname"
/>
<one-to-one
name="productProfile"
class="com.sirius.webapps.shoppingmall.products.ProductProfile"
cascade="none"
outer-join="auto"
constrained="false"
/>

<many-to-one name="brand"
class="com.sirius.webapps.shoppingmall.products.CosmeticBrand"
cascade="none"
outer-join="auto"
update="true"
insert="true"
column="brand_id"
/> </class>
</hibernate-mapping>

CosmeticBrand.hbm.xml<?xml version="1.0"?>

<hibernate-mapping>
<class
name="com.sirius.webapps.shoppingmall.products.CosmeticBrand"
table="Cosmetic_Brand"
dynamic-update="false">

<id
name="brandID"
column="brandID"
type="string"
unsaved-value="any"
>
<generator class="assigned"/>
</id>
<property
name="brandName"
type="string"
update="true"
insert="true"
column="brand_name"


<set name="products"
table="Cosmetic_Products"
lazy="false"
cascade="all"
sort="unsorted"
>
<key column="brand_id"/>
<one-to-many
class="com.sirius.webapps.shoppingmall.products.CosmeticProduct"/>
</set>



</class>
</hibernate-mapping>

ProductProfile.hbm.xml
<?xml version="1.0"?>

<hibernate-mapping>
<class
name="com.sirius.webapps.shoppingmall.products.ProductProfile"
table="Products_Profile"
dynamic-update="false">

<id
name="id"
column="ID"
type="string"
unsaved-value="any"
>
<generator class="assigned"/>
</id>
<property
name="quantity"
type="integer"
update="true"
insert="true"
column="Quantity"
/>

</class>
</hibernate-mapping>

CosmeticProduct and CosmeticBrand has a many to one relationship
and an one to one between CosmeticProduct and ProductProfile

when i eliminated
<set name="products"
table="Cosmetic_Products"
lazy="false"
cascade="all"
sort="unsorted"
>
<key column="brand_id"/>
<one-to-many
class="com.sirius.webapps.shoppingmall.products.CosmeticProduct"/>
</set>

in CosmeticBrand.hbm.xml, no exception was found but an incorrect shema was created. i donnot what on earth was wrong ! plz help me
THX!!!!!
log4j:WARN No appenders could be found for logger (net.sf.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
net.sf.hibernate.MappingException: Error reading resource: com/sirius/webapps/shoppingmall/products/entity/brand/CosmeticBrand.hbm.xml
at net.sf.hibernate.cfg.Configuration.addResource(Configuration.java:307)
at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:957)
at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:909)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:845)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:831)
at test.GenerateSchema.main(GenerateSchema.java:23)
Caused by: net.sf.hibernate.MappingException: duplicate import: CosmeticBrand
at net.sf.hibernate.cfg.Mappings.addImport(Mappings.java:82)
at net.sf.hibernate.cfg.Binder.bindClass(Binder.java:126)
at net.sf.hibernate.cfg.Binder.bindRootClass(Binder.java:217)
at net.sf.hibernate.cfg.Binder.bindRoot(Binder.java:1204)
at net.sf.hibernate.cfg.Configuration.add(Configuration.java:247)
at net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:281)
at net.sf.hibernate.cfg.Configuration.addResource(Configuration.java:304)
... 5 more

Start by configuring Log4J properly and you will many more messages before your stacktrace.... Sure they will help you to understand what's going on.

Moreover, your log prints:

Looks like hibernate has problem to read the file (wrong name?)...

You're mapping the 2 one-to-many mapping to CosmeticProduct in the same brand_id. This is unexpected.