Is Composition possible with Hibernate? --------------------------------------- Key: HHH-1235 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1235 Project: Hibernate Core Issue Type: Task Components: core Affects Versions: 3.0.5 Environment: Oracle 9i,Hibernate 3.0.5, Eclipse 3.1 Reporter: chaitanya sanjay karmarakr Original Estimate: 24h Remaining Estimate: 24h I have a POJO Client.java.I want this class to compose an object of another class ClientAddress; which is a POJO class too. A *.hbm.xml is present for both. package com.hibernate.tutorial.classes; public class Client{ private Long clientNo; private String clientName; private Long clientOfficeId; private String clientStatusCode; private String clientFundCode; private ClientAddressUsage clientAddressUsagePOC; public ClientAddressUsage getClientAddressUsage() { return clientAddressUsage; } public void setClientAddressUsage(ClientAddressUsage clientAddressUsage) { this.clientAddressUsage = clientAddressUsage; } public String getClientFundCode() { return clientFundCode; } public void setClientFundCode(String clientFundCode) { this.clientFundCode = clientFundCode; } public String getClientName() { return clientName; } public void setClientName(String clientName) { this.clientName = clientName; } public Long getClientNo() { return clientNo; } public void setClientNo(Long clientNo) { this.clientNo = clientNo; } public Long getClientOfficeId() { return clientOfficeId; } public void setClientOfficeId(Long clientOfficeId) { this.clientOfficeId = clientOfficeId; } public String getClientStatusCode() { return clientStatusCode; } public void setClientStatusCode(String clientStatusCode) { this.clientStatusCode = clientStatusCode; } } Now, for acheiving composition is the Client.hbm.xml correct: <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name="com.tutorial.hibernate.classes.ClientPOC" table="CLIENT_POC" > <composite-id > <key-property name="clientNo" type="java.lang.Long" column="CLIENT_NO"/> <key-property name="clientOfficeId" type="java.lang.Long" column="CLIENT_OFFICE_ID"/> </composite-id> <property name="clientName" type="java.lang.String"> <column name="CLIENT_NAME" length="40" /> </property> <property name="clientStatusCode" type="java.lang.String"> <column name="CLIENT_STATUS_CODE" length="1" /> </property> <property name="clientFundCode" type="java.lang.String"> <column name="CLIENT_FUND_CODE" length="3" /> </property> <property name="clientAddressUsagePOC" type="java.lang.Object" access="com.tutorial.hibernate.classes.ClientAddressUsagePOC" > </property> </class> </hibernate-mapping>