Here, an Org object has a many-to-one reference to a User object, which is mapped as using an interface proxy. When the Org object is loaded, when Hibernate tries to call the setUser method on Org, it only has a proxy that implements IRep and IUser, but the setter method requires a User object, so Java throws IllegalArgumentException. I tried mapping the many-to-one to the interface -- IUser, but then I get a Hibernate startup error . Can you tell me what I'm doing wrong? Thanks!



Hibernate version: 2.1 (bundled with MyEclipse 3.8.2)

Mapping documents:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping package="com.xyz.newprod.bd">
<meta attribute="use-in-tostring">true</meta>

<!-- /////////////// Org ///////////////// -->

<class name="Org">
<id name="id" type="integer">
<meta attribute="scope-set">private</meta>
<meta attribute="scope-get">private</meta>
<generator class="native"/>
</id>
<property name="primaryKey"
type="com.xyz.newprod.hibernate.IntegerPrimaryKeyUT" formula="id">
<meta attribute="scope-set">private</meta>
</property>
<property name="name" type="string" length="30" not-null="true"/>
<many-to-one name="parent" column="parentId" outer-join="false"
class="com.xyz.newprod.bd.Org" cascade="none"/>
<many-to-one name="contact" column="contactId" outer-join="false"
class="com.xyz.newprod.common.Contact" cascade="all"
unique="true"/>
<many-to-one name="manager" column="managerId" outer-join="false"
class="com.xyz.newprod.user.User" cascade="none"/>
</class>

</hibernate-mapping>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">


<hibernate-mapping package="com.xyz.newprod.user">

<class name="User" proxy="com.xyz.newprod.user.IUser">

<id name="id" type="integer">
<meta attribute="scope-set">private</meta>
<meta attribute="scope-get">protected</meta>
<meta attribute="use-in-tostring">true</meta>
<generator class="native"/>
</id>
<timestamp name="updateDate"/>
<property name="primaryKey"
type="com.xyz.newprod.hibernate.IntegerPrimaryKeyUT" formula="id">
<meta attribute="scope-set">private</meta>
</property>
<property name="firstName" type="string" length="50"/>
<property name="lastName" type="string" length="50" not-null="true"/>
<property name="login" type="string" length="16" not-null="true" unique="true"/>
<property name="status"
type="com.xyz.newprod.hibernate.UserStatusUT">
<column name="StatusId" length="1" not-null="true" check="StatusId in ('A','I','T')"/>
</property>

<joined-subclass name="Rep" proxy="com.xyz.newprod.user.IRep">
<key column="userId"/>
<property name="ssn" type="string" length="11"/>
<property name="birthDate" type="date"/>
</joined-subclass>

</class>

</hibernate-mapping>

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

return getHibernateSession().load( Org.class, new Integer(2) );

Full stack trace of any exception that occurs:

com.xyz.foundation.exception.PersistenceException: net.sf.hibernate.PropertyAccessException: IllegalArgumentException occurred while calling setter of com.kingland.tapestre.bd.Org.manager
at com.xyz.newprod.bd.BdDaoImpl.find(BdDaoImpl.java:21)
at com.xyz.newprod.test.Test1.main(Test1.java:89)
Caused by: net.sf.hibernate.PropertyAccessException: IllegalArgumentException occurred while calling setter of com.xyz.newprod.bd.Org.manager
at net.sf.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:68)
at net.sf.hibernate.persister.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:221)
at net.sf.hibernate.impl.SessionImpl.initializeEntity(SessionImpl.java:2199)
at net.sf.hibernate.loader.Loader.doQuery(Loader.java:240)
at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:133)
at net.sf.hibernate.loader.Loader.loadEntity(Loader.java:836)
at net.sf.hibernate.loader.Loader.loadEntity(Loader.java:856)
at net.sf.hibernate.loader.EntityLoader.load(EntityLoader.java:59)
at net.sf.hibernate.loader.EntityLoader.load(EntityLoader.java:51)
at net.sf.hibernate.persister.EntityPersister.load(EntityPersister.java:419)
at net.sf.hibernate.impl.SessionImpl.doLoad(SessionImpl.java:2106)
at net.sf.hibernate.impl.SessionImpl.doLoadByClass(SessionImpl.java:1980)
at net.sf.hibernate.impl.SessionImpl.load(SessionImpl.java:1909)
at com.xyz.newprod.bd.BdDaoImpl.find(BdDaoImpl.java:18)
... 1 more
Caused by: java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at net.sf.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:38)
... 14 more
Exception in thread "main"

Name and version of the database you are using:

DB2 for I5 series, V5R3

The generated SQL (show_sql=true):

select org0_.id as id1_, org0_.name as name1_, org0_.level as level1_, org0_.parentId as parentId1_, org0_.contactId as contactId1_, org0_.managerId as managerId1_, org0_.id as f1_1_, orgconfig1_.level as level0_, orgconfig1_.singularName as singular2_0_, orgconfig1_.pluralName as pluralName0_, orgconfig1_.description as descript4_0_ from Org org0_ left outer join OrgConfig orgconfig1_ on org0_.level=orgconfig1_.level where org0_.id=?


Debug level Hibernate log excerpt:

I'm having a very similiar problem where my domain is defined using interfaces, including a number of setter methods for domain objects. Whenever Hibernate tries to use one of the setters, I get an IllegalArgumentException



I think this is because my setter method takes the interface as a parameter, not the bean.

Did you ever find a workaround?

Richard

looks like your setter method needs to accept the interface type

I went completely through the code with a fine tooth comb. In this particular case, the setter method was not part of the interface, so when the setter method was implemented, the wrong type for the parameter was used.

Thanks for your response.

Richard