Posso usar a Collection Set num atributo de Tipo Enum?

Galera, não sei se isso é possível!

Mas como que eu posso usar a Collection Set num atributo de Tipo Enum?

Para ficar mais claro, vou postar o codigo e a Exception gerada. Segue abaixo:

Conta.java

[code]package br.com.financas.imperiumpecunia.dominio;

import java.io.Serializable;
import java.math.BigDecimal;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;

import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.EnumType;
import javax.persistence.Enumerated;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

import org.hibernate.annotations.NamedQuery;

@SuppressWarnings(“serial”)
@NamedQuery(name = “obterValorTotalTipoConta”, query = “SELECT c.valor FROM Conta c WHERE c.tiposDeContas = :tiposDeContas”)
@Entity
@Table
public class Conta implements Serializable {

@Id
@GeneratedValue
@Column(name = "idconta", unique = true, nullable = false)
private Long id;

@ManyToMany(fetch = FetchType.EAGER)
@JoinTable(name = "fornecedor_conta", joinColumns = { @JoinColumn(name = "idconta", nullable = false, updatable = false) }, inverseJoinColumns = { @JoinColumn(name = "idfornecedor", nullable = false, updatable = false) })
private Set<Fornecedor> fornecedores = new HashSet<Fornecedor>(0);

@Basic(fetch = FetchType.LAZY)
@Column(name = "descricao", nullable = false, length = 255)
private String descricao;

@Column(name = "valor", nullable = false)
private BigDecimal valor;

@Enumerated(value = EnumType.STRING)
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "idtipo")
private Set<TipoConta> tiposDeContas = new HashSet<TipoConta>(0);

@Temporal(TemporalType.DATE)
@Column(name = "datavencimento", nullable = false)
private Date dataVencimento;

@Temporal(TemporalType.DATE)
@Column(name = "databaixa")
private Date dataBaixa;

public Long getId() {
	return id;
}

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

public Set<Fornecedor> getFornecedores() {
	return fornecedores;
}

public void setFornecedores(Set<Fornecedor> fornecedores) {
	this.fornecedores = fornecedores;
}

public String getDescricao() {
	return descricao;
}

public void setDescricao(String descricao) {
	this.descricao = descricao;
}

public BigDecimal getValor() {
	return valor;
}

public void setValor(BigDecimal valor) {
	this.valor = valor;
}

public Set<TipoConta> getTiposDeContas() {
	return tiposDeContas;
}

public void setTiposDeContas(Set<TipoConta> tiposDeContas) {
	this.tiposDeContas = tiposDeContas;
}

public Date getDataVencimento() {
	return dataVencimento;
}

public void setDataVencimento(Date dataVencimento) {
	this.dataVencimento = dataVencimento;
}

public Date getDataBaixa() {
	return dataBaixa;
}

public void setDataBaixa(Date dataBaixa) {
	this.dataBaixa = dataBaixa;
}

@Override
public int hashCode() {
	final int prime = 31;
	int result = 1;
	result = prime * result + ((id == null) ? 0 : id.hashCode());
	return result;
}

@Override
public boolean equals(Object obj) {
	if (this == obj)
		return true;
	if (obj == null)
		return false;
	if (getClass() != obj.getClass())
		return false;
	Conta other = (Conta) obj;
	if (id == null) {
		if (other.id != null)
			return false;
	} else if (!id.equals(other.id))
		return false;
	return true;
}

}[/code]

TipoConta.java

[code]package br.com.financas.imperiumpecunia.dominio;

import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table
public enum TipoConta {

DESPESA(1, "DESPESA"), RECEITA(2, "RECEITA");

@Id
@GeneratedValue
@Column(name = "idtipo", unique = true, nullable = false)
private Integer id;

@Basic(fetch = FetchType.LAZY)
@Column(name = "descricao", nullable = false, length = 10)
private String descricao;

private TipoConta(Integer id, String descricao) {
	this.id = id;
	this.descricao = descricao;
}

public Integer getId() {
	return id;
}

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

public String getDescricao() {
	return descricao;
}

public void setDescricao(String descricao) {
	this.descricao = descricao;
}

}[/code]

A exception gerada é a seguinte:

[code]org.hibernate.AnnotationException: @OneToOne or @ManyToOne on br.com.financas.imperiumpecunia.dominio.Conta.tiposDeContas references an unknown entity: java.util.Set
at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPass.java:81)
at org.hibernate.cfg.AnnotationConfiguration.processEndOfQueue(AnnotationConfiguration.java:456)
at org.hibernate.cfg.AnnotationConfiguration.processFkSecondPassInOrder(AnnotationConfiguration.java:438)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:309)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1333)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
at br.com.financas.imperiumpecunia.test.ContaTest.executeAntesDeTodosOsTestes(ContaTest.java:32)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

java.lang.NullPointerException
at br.com.financas.imperiumpecunia.test.ContaTest.executeDepoisDeTodosOsTestes(ContaTest.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:37)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)[/code]

Se alguem puder me ajudar…