All my classes use a custom UserType for the ID. This works fine
with assigned identifers, but when I try to use generated identifiers
(uuid.hex) I get an IllegalArgumentException as Hibernate tries to
set the value directly, losing the benefit of the mapping performed
in the custom UserType.

Is my only way around this creating a custom PropertyAccessor?

Have you considered expanding UserType so that it could perform
the same mappings here as it does for result sets and statements?

thanks,

-r


Hibernate version:

2.1.6

Mapping documents:

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
<class
name="com.opi.domain.User"
table="user"
dynamic-update="true"
dynamic-insert="true"
>

<id
name="id"
column="id"
type="com.opi.common.hibernate.IdUserType"
unsaved-value= "null"
>
<generator class="uuid.hex" />
</id>

<version
name="version"
type="int"
column="version"
access="property"
unsaved-value="null"
/>

<property
name="firstName"
type="java.lang.String"
update="true"
insert="true"
access="property"
column="firstname"
length="256"
not-null="true"
/>

<property
name="lastName"
type="java.lang.String"
update="true"
insert="true"
access="property"
column="lastname"
length="256"
not-null="true"
/>

<property
name="middleName"
type="java.lang.String"
update="true"
insert="true"
access="property"
column="middlename"
length="256"
not-null="false"
/>
</class>
</hibernate-mapping>

Code between sessionFactory.openSession() and session.close():

Full stack trace of any exception that occurs:

com.opi.common.exception.DaoException: net.sf.hibernate.PropertyAccessException: IllegalArgumentException occurred while calling setter of com.opi.domain.User.id
at com.opi.common.hibernate.BaseHibernateDao.createObject(BaseHibernateDao.java:45)
at com.opi.domain.UserHibernateDaoImpl.createUser(UserHibernateDaoImpl.java:25)
at com.opi.domain.DomainHibernateDaosTest.testUserDao(DomainHibernateDaosTest.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:421)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:305)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:186)
Caused by: net.sf.hibernate.PropertyAccessException: IllegalArgumentException occurred while calling setter of com.opi.domain.User.id
at net.sf.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:68)
at net.sf.hibernate.persister.AbstractEntityPersister.setIdentifier(AbstractEntityPersister.java:330)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:844)
at net.sf.hibernate.impl.SessionImpl.saveWithGeneratedIdentifier(SessionImpl.java:779)
at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:738)
at com.opi.common.hibernate.BaseHibernateDao.createObject(BaseHibernateDao.java:41)
... 17 more
Caused by: java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at net.sf.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:38)
... 22 more


Name and version of the database you are using:

MySQL 4.1.3b

Debug level Hibernate log excerpt:

2004-09-20 18:11:05,878 [] DEBUG SessionImpl -generated identifier: 402828a4ff1e1bb500ff1e1cd2960001
2004-09-20 18:11:05,878 [] DEBUG SessionImpl -saving [com.opi.domain.User#402828a4ff1e1bb500ff1e1cd2960001]
2004-09-20 18:11:05,878 [] ERROR BasicPropertyAccessor -IllegalArgumentException in class: com.opi.domain.User, setter method of property: id
2004-09-20 18:11:05,888 [] ERROR BasicPropertyAccessor -expected type: com.opi.common.Id, actual value: java.lang.String

I have the same problem.
What was your solution?