Hi, I try to use a 1:N read-only immutable mapping.

The class LoginUser has a method getAuthorities() which returns an immutable array of Authority objects. I tried several mapping settings.

First I set the mutable flag to false and the cache usage to read-only in the target class Authorities. But that had no effect to the update mechanism. Hibernate tried to update the Authorities when saving LoginUser and it results in a database error.

Next I tried to set the cache usage in the LoginUser mapping. But then I got an exception from hibernate, that i tried to save a read-only cache.

After that i thought declaring the getter as mutable="false" will solve the problem, but with this version i got the following error.

Is it impossible to prevent hibernate from updating an array?

Thanks for your help!


Hibernate version:
3.0.5

Mapping documents:

<hibernate-mapping default-lazy="false">
<class name="LoginUser" table="login_user">

....

<array name="authorities"
cascade="none"
mutable="true">

<key column="loginuser_id" />
<index column="the_index" />
<one-to-many class="Authorities"
/>

</array>

....

</class>
</hibernate-mapping>

<hibernate-mapping default-lazy="false" >
<class name="Authorities" mutable="false">

<subselect>
select distinct r.name, l.id as loginuser_id, r.the_index
from right r, User_Base_Data u, Login_User l
where r.node_id=u.rights_node_id AND u.id=l.user_base_data_id
</subselect>

<cache usage="read-only"/>

<synchronize table="login_user"/>
<synchronize table="user_base_data"/>
<synchronize table="rights_node"/>
<synchronize table="right"/>

<id name="authority"
column="name"
type="string" >

<generator class="native" />
</id>

</class>
</hibernate-mapping>



Full stack trace of any exception that occurs:

Caused by: org.xml.sax.SAXParseException: Attribute "mutable" must be declared for element type "array".
at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.dtd.XMLDTDValidator.addDTDDefaultAttrsAndValidate(Unknown Source)
at org.apache.xerces.impl.dtd.XMLDTDValidator.handleStartElement(Unknown Source)
at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(Unknown Source)

I did a workaround. When using a set instead of an array then variant 1 works. So I use a set and convert it in the original getter method to an array. But nevertheless it would be interesting if an array can´t be immutable.

Thx,
Andi