Occurred while calling setter of Bean.Aluno.disciplinas

Pessoal tenho duas tabelas relacionada entre si sao elas : aluno e disciplina o relacionamento e muitos para muitos o que faz surgi a terceira tabela aluno_disciplina, como voces vere os scripts:
aluno;

public class Aluno   {


     private Integer idaluno;
     private String nome;
     private String endereco;
     private String sexo;
     private String nomepai;
     private String nomemae;
     private String resposavel;
     private String nacionalidade;
     private String naturalidade;
     private String uf;
     private String municipio;
     private Escola escola;
     private String datanascimento;
     private Integer telefone;
     private String resistro;
     private Turma turma;
    private Disciplina disciplina;
     private List<Disciplina> disciplinas;
//gettes / setteres

Aluno.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 06/10/2011 07:17:14 by Hibernate Tools 3.2.1.GA -->
<hibernate-mapping>
    <class name="Bean.Aluno" table="aluno" catalog="sge">
        <id name="idaluno" type="java.lang.Integer">
            <column name="idaluno" />
            <generator class="native" />
        </id>
  
        <property name="nome" type="string">
            <column name="nome" length="45" />
        </property>
        <property name="endereco" type="string">
            <column name="endereco" length="45" />
        </property>
        <property name="sexo" type="string">
            <column name="sexo" length="1" />
        </property>
        <property name="nomepai" type="string">
            <column name="nomepai" length="45" />
        </property>
        <property name="nomemae" type="string">
            <column name="nomemae" length="45" />
        </property>
        <property name="resposavel" type="string">
            <column name="resposavel" length="45" />
        </property>
        <property name="nacionalidade" type="string">
            <column name="nacionalidade" length="45" />
        </property>
        <property name="naturalidade" type="string">
            <column name="naturalidade" length="45" />
        </property>
        <property name="uf" type="string">
            <column name="uf" length="2" />
        </property>
        <property name="municipio" type="string">
            <column name="municipio" length="45" />
        </property>
        <property name="datanascimento" type="string">
            <column name="datanascimento" length="8" />
        </property>
        <property name="telefone" type="int">
            <column name="telefone" length="10" />
        </property>
        <property name="resistro" type="string">
            <column name="resistro" length="20" />
        </property>
        
      <set name="disciplinas" inverse="false" table="aluno_disciplina">
            <key>
                <column name="idaluno" not-null="true" />
            </key>
            <many-to-many entity-name="Bean.Disciplina">
                <column name="iddisciplina" not-null="true" />
            </many-to-many>
        </set> 
       
    </class>
</hibernate-mapping>

discipina:

public class Disciplina {
	private Integer iddisciplina;
	private String nome;
	private String descricao;
	private List<Aluno> alunos;
	//getteres / setteres

Disciplina.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 06/10/2011 07:17:14 by Hibernate Tools 3.2.1.GA -->
<hibernate-mapping>
<class name="Bean.Disciplina" table="disciplina" catalog="sge">
<id name="iddisciplina" type="java.lang.Integer">
<column name="iddisciplina"></column>
<generator class="native">
</generator>
</id>
<property name="nome" type="string">
<column name="nome" length="40"></column>
</property>
<property name="descricao" type="string">
<column name="descricao" length="50"></column>
</property>
    
        <set name="alunos" inverse="true" table="aluno_disciplina">
            <key>
                <column name="iddisciplina" not-null="true" />
            </key>
            <many-to-many entity-name="Bean.Aluno">
                <column name="idaluno" not-null="true" />
            </many-to-many>
        </set>
</class>

</hibernate-mapping>

Na mina pagina jsp para cadastro de aluno quero um o select ja venha carregado com as disciplinas to usando o jsl assim:

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
     <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Cadastro Aluno</title>
</head>
<body>

<div id="container">
<div id="top">
<h1>Cadastror Aluno</h1>
<h3>${mensagem}</h3>
</div>

<div id="leftSide">
<fieldset>
<legend>Aluno</legend>
<form action="Controlador" method="post" class="form"/>
<input type="hidden" name="cmd" id="cmd" value="cadastrarAluno"/>


<label for="nome"> Nome</label>
<div class="div_texbox">
<input type="text" name="nome" id="nome" value="${aluno.nome }"/>
</div>

<label for="endereco">Endereco</label>
<div class="div_texbox">
<input type="text" name="endereco" id="endereco" value="${aluno.endereco}"/>
</div>

<label for="municipio">Municipio</label>
<div class="div_texbox">
<input type="text" name="municipio" id="municipio" value="${aluno.municipio }"/>
</div>
<label for="naturalidade">Naturalidade</label>
<div class="div_texbox">
<input type="text" name="naturalidade" id="naturalidade" value="${aluno.naturalidade}"/>
</div>

<label for="nacionalidade">Nacionalidade</label>
<div class="div_texbox">
<select>
<option  name="nacionalidade" selected="selected">Brasileira</option>
<option name="nacionalidade">Estrangeira</option>
</select>
</div>
<label for="nomemae">Nomemae</label>
<div class="div_texbox">
<input type="text" name="nomemae" id="nomemae" value="${aluno.nomemae}"/>
</div>
<label for="nomepai">Nome Pai</label>
<div class="div_texbox">
<input type="text" name="nomepai" id="nomepai" value="${aluno.nomepai}"/>
</div>
<label for="resposavel">Resposavel</label>
<div class="div_texbox">
<input type="text" name="resposavel" id="resposavel" value="${aluno.resposavel}"/>
</div>
<label for="telefone">Telefone</label>
<div class="div_texbox">
<input type="text" name="telefone" id="telefone" value="${aluno.telefone}"/>
</div>

<label for="resistro">Registro Nº</label>
<div class="div_texbox">
<input type="text" name="resistro" id="resistro" value="${aluno.resistro}"/>
</div>


<label for="datanascimento">Data.Nasc</label>
<div class="div_texbox">
<input type="text" name="datanascimento" id="datanascimento" value="${aluno.datanascimento}"/>
</div>




<label for="iddisciplina">Disciplina</label>
<div class="div_texbox">
<select name="iddisciplina">
<c:forEach var="aluno_disciplina" items="${disciplinas}">
<option value="${aluno_disciplina.iddisciplina.disciplina}" ${aluno_disciplina.iddisciplina.disciplina eq disciplina.aluno_disciplina.iddisciplina.disciplina ? "SELECTED" : ""}>${disciplina.nome}</option>
</c:forEach>
</select>
</div>


<label for="sexo">Sexo</label>
<div class="div_texbox">
<option>M</option>
<input type="radio" name="sexo" id="sexo" value="${aluno.sexo}" />
<option>F</option>
<input type="radio" name="sexo" id="sexo" value="${aluno.sexo}"/>



</div>

<label for="uf">Uf</label>
<div class="div_texbox">
<input type="text" name="uf" id="uf" value="${aluno.uf}"/>
</div>

<div class="button_div">
<input type="submit" name="cadastrar" id="cadastrar" value="Cadastrar"  class="botao"/>
</div>

</form>
</fieldset>
</div>

</div>
</body>
</html>

na hora chamo a minha pagina acontece o seguite:

alunos2_.nome as nome0_0_,
        alunos2_.endereco as endereco0_0_,
        alunos2_.sexo as sexo0_0_,
        alunos2_.nomepai as nomepai0_0_,
        alunos2_.nomemae as nomemae0_0_,
        alunos2_.resposavel as resposavel0_0_,
        alunos2_.nacionalidade as naciona10_0_0_,
        alunos2_.naturalidade as natural11_0_0_,
        alunos2_.uf as uf0_0_,
        alunos2_.municipio as municipio0_0_,
        alunos2_.datanascimento as datanas14_0_0_,
        alunos2_.telefone as telefone0_0_,
        alunos2_.resistro as resistro0_0_,

O erro e esse

[code]org.hibernate.PropertyAccessException: IllegalArgumentException occurred while calling setter of Bean.Aluno.disciplinas
	at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:104)
	at org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:337)
	at org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:200)
	at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3571)
	at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:133)
	at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:854)
	at org.hibernate.loader.Loader.doQuery(Loader.java:729)

[/code]

Alguem poderia me ajudar???

Mudei para o annotation :
mas o select no cadastro do aluno na vem carregado com os dados da dsiciplina do banco:

disciplina:

@Entity  
@Table(name = "disciplina")  
public class Disciplina {
    @Id  
    @GeneratedValue
	private Integer iddisciplina;
	private String nome;
	private String descricao;
        @JoinTable(name = "aluno_disciplina", joinColumns = {  
            @JoinColumn(name = "iddisciplina", referencedColumnName = "iddisciplina")}, inverseJoinColumns = {  
            @JoinColumn(name = "idaluno", referencedColumnName = "idaluno")})  
    @ManyToMany(fetch = FetchType.LAZY)  
	private List<Aluno> alunos;

aluno:

@Entity  
@Table(name = "aluno")  
public class Aluno   {

 @Id  
    @GeneratedValue 
     private Integer idaluno;
     private String nome;
     private String endereco;
     private String sexo;
     private String nomepai;
     private String nomemae;
     private String resposavel;
     private String nacionalidade;
     private String naturalidade;
     private String uf;
     private String municipio;
     private String datanascimento;
     private Integer telefone;
     private String resistro;
   
    @ManyToOne
    private Disciplina disciplina;
    @ManyToMany(mappedBy = "alunos", fetch = FetchType.LAZY) 
     private List<Disciplina> disciplinas;

arquivo de configuraçao:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost/sge</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password"/>
    <property name="hibernate.c3p0.min_size">1</property>
    <property name="hibernate.c3p0.max_size">5</property>
    <property name="hibernate.c3p0.timeout">300</property>
    <property name="hibernate.c3p0.max_statements">500</property>
    <property name="hibernate.c3p0.idle_test_period">300</property>
    <property name="hibernate.current_session_context_class">thread</property>
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.format_sql">true</property>
    
   
  
    <!--
    <mapping resource="Bean/Aluno.hbm.xml"/>
    <mapping resource="Bean/Escola.hbm.xml"/>
    <mapping resource="Bean/Turma.hbm.xml"/>
    <mapping resource="Bean/Disciplina.hbm.xml"/>
    -->
    <mapping  class="Bean.Disciplina"/>
   <mapping class="Bean.Aluno"></mapping>	
  </session-factory>
</hibernate-configuration>

arquivo jss e jsp :

<label for="iddisciplina">Disciplina</label>
<div class="div_texbox">
<select name="iddisciplina">
<c:forEach var="aluno_disciplina" items="${disciplina.disciplinas}">
<option value="${aluno_disciplina}" ${aluno_disciplina eq disciplina.aluno_disciplina.iddisciplina? "SELECTED" : ""}>${disciplina.nome}</option>
</c:forEach>
</select>
</div>

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