Exception [EclipseLink-7220] (Eclipse Persistence Services - 2.0.1.v20100213-r6600): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The @JoinColumns on the annotated element [method getChildSet] from the entity class [class Parent] is incomplete. When the source entity class uses a composite primary key, a @JoinColumn must be specified for each join column using the @JoinColumns. Both the name and the referencedColumnName elements must be specified in each such @JoinColumn.

@Entity
public class Parent {
   

   @OneToMany(cascade=CascadeType.ALL, fetch=FetchType.EAGER, orphanRemoval=true, targetEntity=Child.class)
   @JoinColumns({
        @JoinColumn(name="col1", referencedColumnName="col1", updatable=false),
        @JoinColumn(name="col2", referencedColumnName="col2", updatable=false) })
   public Set<Child> getChildSet() {
       return this.childSet;
   }

}

@Entity
@Table(name = "ClassA")
@Cacheable
public class ClassA implements Serializable{
	private static final long serialVersionUID = -1535466991451378483L;
	private Map<Object, Object> fieldMap = new HashMap<Object, Object>();
	
	public void setId(String value) {
		fieldMap.put("id", value);
	}
	
	@Id
	@Column(name = "id")
	public String getId() {
		return (String) fieldMap.get("id");
	}
	
	public void setCode(String value) {
		fieldMap.put("code", value);
	}
	
	@Column(name = "code")
	public String getCode() {
		return (String) fieldMap.get("code");
	}
	
	public void setName(String value) {
		fieldMap.put("name", value);
	}
	
	@Column(name = "name")
	public String getName() {
		return (String) fieldMap.get("name");
	}
	
	@OneToMany(cascade=CascadeType.ALL, fetch=FetchType.EAGER, orphanRemoval=true, targetEntity=ClassB.class)
	@JoinColumns({
        @JoinColumn(name="id", referencedColumnName="id", updatable=false) })
	public List<ClassB> getListClassB() {
		return (List<ClassB>) fieldMap.get("listClassB");
	}
	
	public void setListClassB(List<ClassB> value) {
		fieldMap.put("listClassB", value);
	}
}

@Entity
@Table(name = "ClassB")
@Cacheable
public class ClassB implements Serializable {
	private static final long serialVersionUID = -7306594226829492246L;
	private Map<Object, Object> fieldMap = new HashMap<Object, Object>();
	
	public void setId(String value) {
		fieldMap.put("id", value);
	}
	
	@Id
	@Column(name = "id")
	public String getId() {
		return (String) fieldMap.get("id");
	}
	
	public void setCoName(String value) {
		fieldMap.put("coName", value);
	}
	
	@Id
	@Column(name = "co_name")
	public String getCoName() {
		return (String) fieldMap.get("coName");
	}
	
	public void setPrice(BigDecimal value) {
		fieldMap.put("price", value);
	}
	
	@Column(name = "price")
	public BigDecimal getPrice() {
		return (BigDecimal) fieldMap.get("price");
	}
}

	@JoinColumns({
        @JoinColumn(name="id", referencedColumnName="id", updatable=false),
        @JoinColumn(name="id", referencedColumnName="id", updatable=false) })
	public List<ClassB> getListClassB() {
		return (List<ClassB>) fieldMap.get("listClassB");
	})

java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
	at foo.bar.TesterMain.init(TesterMain.java:70)
	at foo.bar.TesterMain.main(TesterMain.java:98)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mainEmf' defined in class path resource [data-config.xml]: Invocation of init method failed; nested exception is Exception [EclipseLink-30005] (Eclipse Persistence Services - 2.1.2.v20101206-r8635): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: sun.misc.Launcher$AppClassLoader@11b86e7
Internal Exception: javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.1.2.v20101206-r8635): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [mainPU] failed.
Internal Exception: Exception [EclipseLink-7220] (Eclipse Persistence Services - 2.1.2.v20101206-r8635): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The @JoinColumns on the annotated element [method getListClassB] from the entity class [foo.bar.dao.ClassA] is incomplete. When the source entity class uses a composite primary key, a @JoinColumn must be specified for each join column using the @JoinColumns. Both the name and the referencedColumnName elements must be specified in each such @JoinColumn.
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1412)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:574)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
	at foo.bar.SampleTester.<init>(SampleTester.java:56)
	... 6 more
Caused by: Exception [EclipseLink-30005] (Eclipse Persistence Services - 2.1.2.v20101206-r8635): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: sun.misc.Launcher$AppClassLoader@11b86e7
Internal Exception: javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.1.2.v20101206-r8635): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [mainPU] failed.
Internal Exception: Exception [EclipseLink-7220] (Eclipse Persistence Services - 2.1.2.v20101206-r8635): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The @JoinColumns on the annotated element [method getListClassB] from the entity class [class foo.bar.dao.ClassA] is incomplete. When the source entity class uses a composite primary key, a @JoinColumn must be specified for each join column using the @JoinColumns. Both the name and the referencedColumnName elements must be specified in each such @JoinColumn.
	at org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:126)
	at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:136)
	at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:65)
	at foo.bar.AbstractEntityManagerFactoryWrapper.initEntityManagerFactory(AbstractEntityManagerFactoryWrapper.java:238)
	at foo.bar.AbstractEntityManagerFactoryWrapper.afterPropertiesSet(AbstractEntityManagerFactoryWrapper.java:258)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1469)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1409)
	... 23 more

public class ClassBPK implements Serializable {
	private static final long serialVersionUID = -1151412779028898293L;
	private String id;
	private String coName;
	
	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getCoName() {
		return coName;
	}

	public void setCoName(String coName) {
		this.coName = coName;
	}
}