IllegalArgumentException in calling getter method!

pblack9455 · **Joined:** Wed Nov 03, 2004 5:27 am **Posts:** 5

Hi everyone!

I've been looking at hibernate to improve productivity - ie. less SQL code. I'm newbie and can't find the cause of a seemingly very simple exception.

I'm trying to persist an object that represents a [Page] in a web site. Each page has various people working on it the Role class and each [role] is associated with 0 or more [User]. I'm using ANT to automate the generation of the Objects Page, Role and User etc everything seemed fine until I tried to 'save' the PageRoleUser(s). I get the stack trace below. Has anyone else seen this find of stacktrace and know what I could be looking for? I've scanned through this forum and google but can find anything close to this. Any help appreciated. If I do find a solution myself will post to help anyone else that falls into this problem...

I just don't seem to understand why hibernate throws the IllegalArgumentException on a getter method

Thanks

Hibernate version: 2

Mapping documents:

--- PageRole.hbm.xml ---

<?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="dsys.prototype.cms.wmt.gen.PageRole" table="wmt_PAGE_ROLE" lazy="false">

<id name="id" type="int" column="ROLE_ID">
<meta attribute="scope-set">protected</meta>
<generator class="native"/>
</id>

<property name="title" type="string">
<meta attribute="use-in-tostring">true</meta>
<column name="TITLE" not-null="true" index="ROLE_TITLE"/>
</property>

<property name="narrative" type="string" column="NARRATIVE">
</property>

<set name="pages" table="wmt_PAGE_ROLES" lazy="false">
<key column="ROLE_ID"></key>
<many-to-many class="dsys.prototype.cms.wmt.gen.Page" column="PAGE_ID"/>
</set>



<list name="users" table="wmt_PAGE_ROLE_USERS" lazy="false" >
<key column="ROLE_ID"></key>
<index column="POSITION"></index>

<composite-element class="dsys.prototype.cms.wmt.gen.PageRoleUser" >
<many-to-one class="dsys.prototype.cms.wmt.gen.User" name="user">
<meta attribute="use-in-string">true</meta>
<column name="user_id"/>
</many-to-one>
<property name="narrative" type="string" length="500"/>
<property name="narrative2" type="string" length="500"/>

</composite-element>
</list>

</class>

</hibernate-mapping>

-- user.hbm.xml
<?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="dsys.prototype.cms.wmt.gen.User" table="users_TMP" lazy="false" mutable="false">
<meta attribute="class-description">@author P Black</meta>

<id name="id" type="int" column="user_id">
<meta attribute="scope-set">protected</meta>
<generator class="assigned"/>
</id>

<property name="name" column="name" type="string" update="false"/>
<property name="jobTitle" type="string" column="job_title" update="false"/>
<property name="department" type="string" column="department" update="false" />
<property name="email" type="string" column="email" update="false" />
<property name="userType" type="int" column="user_type" update="false" />

</class>
</hibernate-mapping>

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

try {

sess = getSession();

tx = sess.beginTransaction();

for(Iterator iter = aPage.getRoles().iterator();iter.hasNext();) {
PageRole aRole = (PageRole) iter.next();

sess.saveOrUpdate(aRole);

if(aRole.getUsers()!=null) {
// new bit here
for(Iterator loop = aRole.getUsers().iterator();loop.hasNext();) {
User aUser = (User) loop.next();
sess.saveOrUpdate(aUser);
}

}

}
sess.saveOrUpdate(aPage);
sess.flush();
tx.commit();
success = true;
}
catch(Exception e) {
e.printStackTrace();
rollback(tx);
}
finally {
closeSession(sess);
}

Full stack trace of any exception that occurs:

09:50:52,265 ERROR BasicPropertyAccessor:106 - IllegalArgumentException in class
: dsys.prototype.cms.wmt.gen.PageRoleUser, getter method of property: user
09:50:52,281 ERROR SessionImpl:2379 - Could not synchronize database state with
session
net.sf.hibernate.PropertyAccessException: IllegalArgumentException occurred call
ing getter of dsys.prototype.cms.wmt.gen.PageRoleUser.user
at net.sf.hibernate.property.BasicPropertyAccessor$BasicGetter.get(Basic
PropertyAccessor.java:110)
at net.sf.hibernate.type.ComponentType.getPropertyValue(ComponentType.ja
va:179)
at net.sf.hibernate.type.ComponentType.getPropertyValues(ComponentType.j
ava:205)
at net.sf.hibernate.type.ComponentType.nullSafeGetValues(ComponentType.j
ava:164)
at net.sf.hibernate.type.ComponentType.nullSafeSet(ComponentType.java:15
1)
at net.sf.hibernate.collection.AbstractCollectionPersister.writeElement(
AbstractCollectionPersister.java:384)
at net.sf.hibernate.collection.List.writeTo(List.java:299)
at net.sf.hibernate.collection.AbstractCollectionPersister.insertRows(Ab
stractCollectionPersister.java:607)
at net.sf.hibernate.impl.ScheduledCollectionUpdate.execute(ScheduledColl
ectionUpdate.java:49)
at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2418)
at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2374)
at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2240)
at dsys.prototype.cms.wmt.dao.WMTDAO.updatePage(WMTDAO.java:272)
at dsys.prototype.cms.wmt.rmi.WMTServer.updatePage(WMTServer.java:147)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
at sun.rmi.transport.Transport$1.run(Transport.java:148)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:4
60)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport
.java:701)
at java.lang.Thread.run(Thread.java:534)
Caused by: java.lang.IllegalArgumentException: object is not an instance of decl
aring class
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at net.sf.hibernate.property.BasicPropertyAccessor$BasicGetter.get(Basic
PropertyAccessor.java:96)
... 24 more

Name and version of the database you are using: MS SQL Server 2k

The generated SQL (show_sql=true):

Debug level Hibernate log excerpt:

pblack9455 · **Joined:** Wed Nov 03, 2004 5:27 am **Posts:** 5

Okay, I put my hand up!!!

I was trying to store [Users] in the users property of the [PageRole] object. But what I really should do it store [PageRoleUser] objects there instead... the [User] object is a property of [PageRoleUser].

Thanks all those folks who looked at this and sorry to waste your time, but hope fully next time someone get that message they will check they are storing the correct object in their collections...

Thanks All

Paul