Bean property 'nome' is not readable or has an invalid getter method:

Estou com Seguinte Erro ao Carregar Formulário.

org.apache.jasper.JasperException: javax.servlet.ServletException: javax.servlet.jsp.JspException: org.springframework.beans.NotReadablePropertyException: Invalid property 'nome' of bean class [java.lang.Class]: Bean property 'nome' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?

Segue Class Usuario

@Entity public class Usuario implements UserDetails {

private static final long serialVersionUID = 1L;

@Id
private String nome;
private String email;
private String senha;
private String sumarioPath;

@ManyToMany(fetch = FetchType.EAGER)
@JoinTable(name = "Usuario_Role",
    joinColumns = @JoinColumn(name = "email"), 
    inverseJoinColumns = @JoinColumn(name = "role_nome"))
private List<Role> roles = new ArrayList<>();

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public String getSenha() {
    return senha;
}

public void setSenha(String senha) {
    this.senha = senha;
}

public String getNome() {
    return nome;
}

public void setNome(String nome) {
    this.nome = nome;
}

public List<Role> getRoles() {
    return roles;
}

public void setRoles(List<Role> roles) {
    this.roles = roles;
}

@Override
public Collection<? extends GrantedAuthority> getAuthorities() {
    return this.roles;
}

@Override
public String getPassword() {
    return this.senha;
}

@Override
public String getUsername() {
    return this.email;
}

@Override
public boolean isAccountNonExpired() {
    return true;
}

@Override
public boolean isAccountNonLocked() {
    return true;
}

@Override
public boolean isCredentialsNonExpired() {
    return true;
}

@Override
public boolean isEnabled() {
    return true;
}

public String getSumarioPath() {
    return sumarioPath;
}

public void setSumarioPath(String sumarioPath) {
    this.sumarioPath = sumarioPath;
}

}

Segue Div do Formulario .

<div class="container">
    <h1>Cadastro de Usuario</h1>
    <form:form action="${s:mvcUrl('UC#gravar').build()}" method="post" commandName="usuario" enctype="multipart/form-data">
        <div class="form-group">
            <label>Nome</label>
            <input type="text" name="usuario.nome" cssClass="form-control"/>
            <form:errors path="nome" />
        </div>
        <div class="form-group">
            <label>Email</label>
            <input type="text" name="email" cssClass="form-control"/>
            <form:errors path="usuario.email" />
        </div>
        <div class="form-group">
            <label>Senha</label>
            <input type="password" name="senha" cssClass="form-control"/>
            <form:errors path="usuario.senha" />
        </div>
    <button type="submit" class="btn btn-primary">Cadastrar</button>
            </form:form>
</div>

Segue Controller.

@Controller @RequestMapping(value="/usuario") public class UsuarioController {

@Autowired
private UsuarioDAO dao;

@Autowired
private FileSaver fileSaver;

@InitBinder
public void initBinder(WebDataBinder binder) {
    binder.addValidators(new UsuarioValidation());
}

@RequestMapping("/form")
public ModelAndView form(Usuario usuarios) {
    ModelAndView modelAndView = new ModelAndView("form");
    modelAndView.addObject("usuario", Usuario.class);
    return modelAndView;
}

@RequestMapping(method=RequestMethod.POST)
public ModelAndView gravar(MultipartFile sumario, @Valid Usuario usuario, BindingResult result, 
            RedirectAttributes redirectAttributes){

    if(result.hasErrors()) {
        return form(usuario);
    }
    dao.gravar(usuario);
    String path = fileSaver.write("arquivos-sumario", sumario);
    usuario.setSumarioPath(path);
    redirectAttributes.addFlashAttribute("message", "Produto cadastrado com sucesso!");

    return new ModelAndView("redirect:/usuario");
}

@RequestMapping( method=RequestMethod.GET)
public ModelAndView listar() {
    List<Usuario> usuarios = dao.listar();
    ModelAndView modelAndView = new ModelAndView("usuarios");
    modelAndView.addObject("usuario", usuarios);
    return modelAndView;
}
}