Hibernate version:
2.1.6
Mapping documents:
<hibernate-mapping
>
<class
name="com.araujo.convenios.model.persistence.medico.Medico"
table="MEDICO"
dynamic-update="false"
dynamic-insert="false"
select-before-update="false"
optimistic-lock="version"
mutable="false"
>

<composite-id
name="pk"
class="com.araujo.convenios.model.persistence.medico.MedicoPK"
>
<key-property
name="codigoCrm"
type="java.lang.Integer"
column="MEDI_CD_CRM"
/>

<key-property
name="siglaUfCrm"
type="java.lang.String"
column="MEDI_SG_UF_CRM"
/>

<key-property
name="tipoPrescritor"
type="com.araujo.convenios.model.enum.TipoPrescritorEnum"
column="MEDI_TP_PRESCRITOR"
/>

</composite-id>

<property
name="nome"
type="java.lang.String"
update="true"
insert="true"
access="property"
column="MEDI_NM_MEDICO"
/>

<!--
To add non XDoclet property mappings, create a file named
hibernate-properties-Medico.xml
containing the additional properties and place it in your merge dir.
-->

</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
>
<class
name="com.araujo.convenios.model.persistence.empresamedico.EmpresaMedico"
table="EMPRESA_MEDICO"
dynamic-update="false"
dynamic-insert="false"
select-before-update="false"
optimistic-lock="version"
>

<composite-id
name="pk"
class="com.araujo.convenios.model.persistence.empresamedico.EmpresaMedicoPk"
>

<key-many-to-one
name="empresa"
class="com.araujo.convenios.model.persistence.empresa.Empresa"
column="EMPR_CD_EMPRESA"
/>

<key-many-to-one
name="medico"
class="com.araujo.convenios.model.persistence.medico.Medico"
column="medico"
/>

</composite-id>

<!--
To add non XDoclet property mappings, create a file named
hibernate-properties-EmpresaMedico.xml
containing the additional properties and place it in your merge dir.
-->

</class>

</hibernate-mapping>

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

Full stack trace of any exception that occurs:

net.sf.hibernate.MappingException: Foreign key (EMPRESA_MEDICO [elt])) must have same number of columns as the referenced primary key (MEDICO [MEDI_CD_CRM,MEDI_SG_UF_CRM,MEDI_TP_PRESCRITOR])
at net.sf.hibernate.mapping.ForeignKey.setReferencedTable(ForeignKey.java:60)
at net.sf.hibernate.cfg.Configuration.secondPassCompileForeignKeys(Configuration.java:691)
at net.sf.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:666)
at net.sf.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:784)
at org.jboss.hibernate.jmx.Hibernate.buildSessionFactory(Hibernate.java:583)
at org.jboss.hibernate.jmx.Hibernate.startService(Hibernate.java:551)
at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:272)
at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:222)
at sun.reflect.GeneratedMethodAccessor38.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:144)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:249)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:891)
at $Proxy0.start(Unknown Source)
at org.jboss.system.ServiceController.start(ServiceController.java:416)
at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:144)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:249)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy4.start(Unknown Source)
at org.jboss.deployment.SARDeployer.start(SARDeployer.java:261)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:964)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:956)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:956)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:775)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:738)
at sun.reflect.GeneratedMethodAccessor46.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:144)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:122)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:131)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:249)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy8.deploy(Unknown Source)
at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:305)
at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:481)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:204)
at org.jboss.deployment.scanner.AbstractDeploymentScanner.startService(AbstractDeploymentScanner.java:277)
at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:272)
at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:222)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:144)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:249)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:891)
at $Proxy0.start(Unknown Source)
at org.jboss.system.ServiceController.start(ServiceController.java:416)
at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:144)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:249)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy4.start(Unknown Source)
at org.jboss.deployment.SARDeployer.start(SARDeployer.java:261)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:964)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:775)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:738)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:722)
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 org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:144)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:122)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:131)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:249)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy5.deploy(Unknown Source)
at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:413)
at org.jboss.system.server.ServerImpl.start(ServerImpl.java:310)
at org.jboss.Main.boot(Main.java:162)
at org.jboss.Main$1.run(Main.java:423)
at java.lang.Thread.run(Thread.java:534)

Well I'm sure that the second mapping is wrong. But it was generated by hibernatedoclet...

What I have is a entity that has a composite-id which one of the keys is another entity with a composite-id. Is it possible? how?

/**
* @return Returns the medico.
* @hibernate.many-to-one class = "com.araujo.convenios.model.persistence.medico.Medico"
*
* @hibernate.column name = "MEDI_CD_CRM"
* @hibernate.column name = "MEDI_SG_UF_CRM"
* @hibernate.column name = "MEDI_TP_PRESCRITOR"
*
*/
public Medico getMedico() {
return medico;
}