JPA EntityManager merge infinite loop - java.lang.StackOverflowError

Perform the following mapping with JPA: public class Papel{ .... @OneToMany(mappedBy = "id.papel" , cascade = { CascadeType.ALL }, orphanRemoval = true ) private List<PermissaoAtribuida> permissoesAtribuidas = new ArrayList<>(); .... } public class Permissao{ .... @Id @Getter @Setter @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "PK" , insertable = false , updatable = false ) private Integer id; .... } public class PermissaoAtribuida{ .... @EmbeddedId private Id id; @Embeddable @EqualsAndHashCode(of = { "permissao" , "papel" }) public static class Id{ @ManyToOne(optional = false , fetch = FetchType.LAZY) @JoinColumn(name = "FK_PERMISSAO" , nullable = false ) private Permissao permissao; @ManyToOne(optional = false , fetch = FetchType.LAZY) @JoinColumn(name = "FK_PAPEL" , nullable = false ) private Papel papel; } .... } And invoke the following code snippet, whereas papelServico is an EJB abstracting the DAO layer: Papel papel = new Papel(); papel.setNome( "Insert" ); papelServico.insert(papel); Permissao permissao = ... List<PermissaoAtribuida> l = new ArrayList<>(); l.add( new PermissaoAtribuida(permissao, papel)); papel.setPermissoesAtribuidas(l); papel.setNome( "Update" ); papelServico.update(papel); This problem only occurs if the permissaoAtribuida properties of class Papel are mapped with cascade = {CascadeType.ALL} .