org.hibernate.loader.MultipleBagFetchException: cannot simultaneously fetch multiple bags

Adicione a notação @Fetch(FetchMode.SELECT)

@ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
@Fetch(FetchMode.SELECT)
@JoinTable(
name="analista_grupoempresa",
joinColumns=@JoinColumn(name="grupoempresa_id"),
inverseJoinColumns=@JoinColumn(name="analista_id")
)
private List<Analista> analistas = new ArrayList<Analista>();