Hibernate: many-to-many e atributos na tabela de associação.

Olá, estou tentando fazer um relacionamento many-to-many com um atributo na tabela de join e há um erro me perseguindo. Segui a doc do Hibernate e fiz o seguinte:
Classe que representa o relacionamento com um atributo:

public class RelationshipPurchaseGoods implements Serializable {
   
    /**
     *
     */
    private Goods goods;

/**
     *
     */
    private int quantity;

/**
     * Returns the value of {@link #goods goods} to this object.
     *
     * @hibernate.many-to-one cascade="none"
     *                        class="br.ufpe.scacin.model.Goods"
     *                        column = "FK_GOODS_ID"
     *                        not-null="true"
     *
     * @return Returns the goods.
     */
    public Goods getGoods() {
        return this.goods;
    }

/**
     * Sets the value of {@link #goods} to this object.
     *
     * @param goods The goods to set.
     */
    public void setGoods(Goods goods) {
        this.goods = goods;
    }

/**
     * Returns the value of {@link #quantity} to this object.
     *
     * @hibernate.property column="GOODS_QUANTITY"
     *                     not-null="true"
     *                     type="int"
     *                     update="true"
     *
     * @return Returns the quantity.
     */
    public int getQuantity() {
        return this.quantity;
    }

/**
     * Sets the value of {@link #quantity} to this object.
     *
     * @param quantity The quantity to set.
     */
    public void setQuantity(int quantity) {
        this.quantity = quantity;
    }

/**
     *
     * @param obj
     * @return
     *
     * @see java.lang.Object#equals(java.lang.Object)
     */
    public boolean equals(Object obj) {
        boolean result = false;

if (obj instanceof RelationshipPurchaseGoods) {
            result = EqualsBuilder.reflectionEquals(this, obj);
        }

return result;
    }

/**
     * @return
     *
     * @see java.lang.Object#hashCode()
     */
    public int hashCode() {
        return HashCodeBuilder.reflectionHashCode(this);
    }

/**
     * @return
     *
     * @see java.lang.Object#toString()
     */
    public String toString() {
        ToStringStyle style = ToStringStyle.MULTI_LINE_STYLE;

return ToStringBuilder.reflectionToString(this, style);
    }
}

Como o relacionamento é bidirecional, não precisei colocar um atributo Purchase nessa classe. Em Purchase, eu tenho o seguinte:

O que vai gerar o seguinte arquivo para mapeamento:

<?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="br.ufpe.scacin.model.Purchase"
        table="SCACIN_PURCHASE"
        dynamic-update="false"
        dynamic-insert="false"
    >

<many-to-one
            name="costumer"
            class="br.ufpe.scacin.model.User"
            cascade="none"
            outer-join="auto"
            update="true"
            insert="true"
            access="property"
            column="USER_ID"
            not-null="true"
        />

<composite-element
                  class="br.ufpe.scacin.model.RelationshipPurchaseGoods"
              >

<many-to-one
            name="goods"
            class="br.ufpe.scacin.model.Goods"
            cascade="none"
            outer-join="auto"
            update="true"
            insert="true"
            access="property"
            column="FK_GOODS_ID"
            not-null="true"
        />

</composite-element>

</bag>
    </class>
</hibernate-mapping>

O erro é o seguinte, o hibernate simplesmente não consegue relacionar Goods ao objeto de relacionamento e então quando tento salvar o Purchase tenho o seguinte log com o erro:

Hibernate: insert into JOIN_PURCHASE_GOODS (FK_PURCHASE_ID, FK_GOODS_ID, JOIN_PURCHASE_GOODS_QUANTITY) values (?, ?, ?)
04/08/2004 19:35:42 net.sf.hibernate.util.JDBCExceptionReporter logExceptions
WARNING: SQL Error: 1048, SQLState: S1000
04/08/2004 19:35:42 net.sf.hibernate.util.JDBCExceptionReporter logExceptions
SEVERE: General error, message from server: "Column 'FK_GOODS_ID' cannot be null"
04/08/2004 19:35:42 net.sf.hibernate.util.JDBCExceptionReporter logExceptions
WARNING: SQL Error: 1048, SQLState: S1000
04/08/2004 19:35:42 net.sf.hibernate.util.JDBCExceptionReporter logExceptions
SEVERE: General error, message from server: "Column 'FK_GOODS_ID' cannot be null"
04/08/2004 19:35:42 net.sf.hibernate.JDBCException <init>
SEVERE: Could not execute JDBC batch update
java.sql.BatchUpdateException: General error, message from server: "Column 'FK_GOODS_ID' cannot be null"
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1367)
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeBatch(DelegatingPreparedStatement.java:231)
at net.sf.hibernate.impl.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:54)
at net.sf.hibernate.impl.BatcherImpl.executeBatch(BatcherImpl.java:122)
at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2417)
at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2371)
at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2236)
at net.sf.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:61)
at org.springframework.orm.hibernate.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:386)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:316)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:211)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:13
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:14
at $Proxy2.insert(Unknown Source)
at br.ufpe.scacin.manager.PurchaseManager.insert(PurchaseManager.java:95)
at br.ufpe.scacin.SCACInFacade.insert(SCACInFacade.java:314)

at br.ufpe.scacin.SCACInFacade.main(SCACInFacade.java:506)
04/08/2004 19:35:42 net.sf.hibernate.impl.SessionImpl execute
SEVERE: Could not synchronize database state with session
net.sf.hibernate.JDBCException: Could not execute JDBC batch update
at net.sf.hibernate.impl.BatcherImpl.executeBatch(BatcherImpl.java:129)
at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2417)
at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2371)
at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2236)
at net.sf.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:61)
at org.springframework.orm.hibernate.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:386)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:316)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:211)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:13
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:14
at $Proxy2.insert(Unknown Source)
at br.ufpe.scacin.manager.PurchaseManager.insert(PurchaseManager.java:95)
at br.ufpe.scacin.SCACInFacade.insert(SCACInFacade.java:314)
at br.ufpe.scacin.SCACInFacade.main(SCACInFacade.java:506)
Caused by: java.sql.BatchUpdateException: General error, message from server: "Column 'FK_GOODS_ID' cannot be null"
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1367)
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeBatch(DelegatingPreparedStatement.java:231)
at net.sf.hibernate.impl.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:54)
at net.sf.hibernate.impl.BatcherImpl.executeBatch(BatcherImpl.java:122)
... 13 more
04/08/2004 19:35:42 org.springframework.jdbc.support.SQLStateSQLExceptionTranslator translate
INFO: Translating SQLException with SQLState 'S1000' and errorCode '1048' and message [General error, message from server: "Column 'FK_GOODS_ID' cannot be null"]; SQL was [null] for task [HibernateTemplate]
org.springframework.jdbc.UncategorizedSQLException: (HibernateTemplate): encountered SQLException [General error, message from server: "Column 'FK_GOODS_ID' cannot be null"]; nested exception is java.sql.BatchUpdateException: General error, message from server: "Column 'FK_GOODS_ID' cannot be null"
java.sql.BatchUpdateException: General error, message from server: "Column 'FK_GOODS_ID' cannot be null"
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1367)
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeBatch(DelegatingPreparedStatement.java:231)
at net.sf.hibernate.impl.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:54)
at net.sf.hibernate.impl.BatcherImpl.executeBatch(BatcherImpl.java:122)
at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2417)
at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2371)
at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2236)
at net.sf.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:61)
at org.springframework.orm.hibernate.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:386)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:316)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:211)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:13
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:14
at $Proxy2.insert(Unknown Source)
at br.ufpe.scacin.manager.PurchaseManager.insert(PurchaseManager.java:95)
at br.ufpe.scacin.SCACInFacade.insert(SCACInFacade.java:314)
at br.ufpe.scacin.SCACInFacade.main(SCACInFacade.java:506)

Mais detalhes:
Hibernate 2.1.4
MySQL 4.0
Windows 2000
A DDL da tabela de join:

Qualquer sugestão é muito bem vinda.

valeuz...

Pois é, recado para mim mesmo: vai aprender a escrever casos de teste direito, seu burro!

valeuz...

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