After I updated to Seam 2.0CR2 the following error appears:

ERROR [BasicLazyInitializer] Javassist Enhancement failed: com.bcsinfo.security.model.Profile
java.lang.RuntimeException: java.lang.IllegalArgumentException: Can not set static javassist.util.proxy.MethodFilter field com.bcsinfo.security.model.Profile_$$_javassist_0._method_filter to org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer$1
 at javassist.util.proxy.ProxyFactory.setField(ProxyFactory.java:356)
 at javassist.util.proxy.ProxyFactory.createClass3(ProxyFactory.java:339)
 at javassist.util.proxy.ProxyFactory.createClass2(ProxyFactory.java:312)
 at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:271)
 at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxyFactory(JavassistLazyInitializer.java:138)
 at org.hibernate.proxy.pojo.javassist.JavassistProxyFactory.postInstantiate(JavassistProxyFactory.java:42)
 at org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:162)

at org.jboss.Main$1.run(Main.java:508)
 at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.IllegalArgumentException: Can not set static javassist.util.proxy.MethodFilter field com.bcsinfo.security.model.Profile_$$_javassist_0._method_filter to org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer$1
 at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:146)
 at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:150)
 at sun.reflect.UnsafeStaticObjectFieldAccessorImpl.set(UnsafeStaticObjectFieldAccessorImpl.java:61)
 at java.lang.reflect.Field.set(Field.java:657)
 at javassist.util.proxy.ProxyFactory.setField(ProxyFactory.java:352)
 ... 170 more
13:24:33,647 INFO [STDOUT] 13:24:33,616 WARN [PojoEntityTuplizer] could not create proxy factory for:com.bcsinfo.security.model.Profile
org.hibernate.HibernateException: Javassist Enhancement failed: com.bcsinfo.security.model.Profile
 at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxyFactory(JavassistLazyInitializer.java:145)
 at org.hibernate.proxy.pojo.javassist.JavassistProxyFactory.postInstantiate(JavassistProxyFactory.java:42)
 at org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:162)

@Entity
@Table(name = "BAS_ROLE", schema = "UTIL")
public class Profile extends Pojo implements Serializable {

 @Column(name = "ID_ROLE")
 @Id
 @GeneratedValue(strategy = GenerationType.AUTO)
 @NotNull
 private long id;

 @NotNull
 private String profile;

 private String description;

 @ManyToOne
 @JoinColumn(name = "ID_LICENCA")
 private License license;

 private boolean screenProfile;

 @ManyToMany
 @JoinTable(name = "CONF_ROLESYSTEM", schema = "UTIL",
 joinColumns = {@JoinColumn(name = "ID_ROLE")},
 inverseJoinColumns = {@JoinColumn(name = "ID_SYSTEM")})
 private List<Sistem> sistems;

 @ManyToMany(mappedBy = "profiles")
 private List<User> users = new ArrayList<User>();

 //GETTERS and SETTERS