Internal server error auf Jackson @ResponseBody

Möchte ich nur zurückgeben, mein user-Objekt als JSON für den Einsatz durch einen ajax-Aufruf auf der client-Seite.

Dieser arbeitete an einer Stelle, und nach einigen updates (nämlich die änderung der Anwendung bereitstellen zu /im Steg), jetzt ist es nicht.

Ich bin nicht eine Ausnahme von dem code, es ist wieder ganz gut, scheint aber die Luft zu sprengen, irgendwo in den root code in Jackson, wenn Sie versuchen, konvertieren Sie das Objekt in JSON.

Wie gesagt, ich bin nicht immer eine Ausnahme, mein ajax-Aufruf einfach in die Luft sprengt sagen Fehlercode "500, Internal Server Error".

/* User contains information about a user of this site, that exists only
 * in the context of this site (no names, addresses).
 */
@Entity(name="User")
@Table(name="USER")
@NamedQuery(
    name="findUserByName",
    query="SELECT OBJECT(u) FROM User u WHERE u.name = :name"
)
public class User extends AuditableEntity implements Serializable {

private static final long serialVersionUID = -1308795024222223320L;

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


@NotEmpty
@MinSkipEmpty(value=6)
@MaxSkipEmpty(value=32)
@Column(name="name", length=32)
private String name;

@NotEmpty
@MinSkipEmpty(value=4)
@MaxSkipEmpty(value=40)
@Column(name="password", length=40)
private String password;

@Column(name="salt", length=40)
private String salt;


@ManyToOne(fetch=FetchType.LAZY, cascade={CascadeType.PERSIST})
@JoinColumn(name="person_id")
private Person person;

@Column(name="last_login")
private Date lastLogin;

@ElementCollection(fetch=FetchType.EAGER)
@CollectionTable(name ="USER_AUTHORITY")
@Column(name="authority")
private List<Integer> authorities;


public Long getId() {
    return id;
}

public void setId(Long id) {
    this.id = id;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = (name == null ? name : name.trim());

}

public String getPassword() {
    return password;
}

public void setPassword(String password) {
    this.password = (password == null ? password : password.trim());
}

public String getSalt() {
    return salt;
}

public void setSalt(String salt) {
    this.salt = salt;
}

public Person getPerson() {
    return person;
}

public void setPerson(Person person) {
    this.person = person;
}

public Date getLastLogin() {
    return lastLogin;
}

public void setLastLogin(Date lastLogin) {
    this.lastLogin = lastLogin;
}

public List<Integer> getAuthorities() {
    return authorities;
}

public void setAuthorities(List<Integer> authorities) {
    this.authorities = authorities;
}

}

Dies ist die Person, die Entität

@Entity(name = "Person")
@Table(name = "PERSON")
public class Person extends AuditableEntity implements Serializable {

    private static final long serialVersionUID = -1308795024262635690L;

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

    @NotEmpty
    @MaxSkipEmpty(value=64)
    @Column(name = "firstName", length=64)
    private String firstName;

    @NotEmpty
    @MaxSkipEmpty(value=64)
    @Column(name = "lastName", length=64)
    private String lastName;

    @NotEmpty
    @Email
    @MaxSkipEmpty(value=256,  message="")
    @Column(name = "email", length=256)
    private String email;

    @DateTimeFormat(pattern="MM/dd/yyyy")
    @NotNull(message = "Required field")
    @Column(name = "date")
    private Date birthday;

    @ManyToOne(fetch = FetchType.LAZY, cascade = { CascadeType.PERSIST })
    @JoinColumn(name = "location_id")
    private Location location;


    public Person() {

    }

    public Person(String firstName, String lastName) {
        super();
        this.firstName = firstName;
        this.lastName = lastName;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

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

    public Location getLocation() {
        return location;
    }

    public void setLocation(Location location) {
        this.location = location;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    @Override
    public String toString() {

        return super.toString() + " name = " + firstName + " " + lastName
                + " id = " + id;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result
                + ((firstName == null) ? 0 : firstName.hashCode());
        result = prime * result + ((id == null) ? 0 : id.hashCode());
        result = prime * result
                + ((lastName == null) ? 0 : lastName.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Person other = (Person) obj;
        if (firstName == null) {
            if (other.firstName != null)
                return false;
        } else if (!firstName.equals(other.firstName))
            return false;
        if (id == null) {
            if (other.id != null)
                return false;
        } else if (!id.equals(other.id))
            return false;
        if (lastName == null) {
            if (other.lastName != null)
                return false;
        } else if (!lastName.equals(other.lastName))
            return false;
        return true;
    }

}

---

@Entity(name = "Location")
@Table(name = "LOCATION")
public class Location extends AuditableEntity implements Serializable {

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

    //name of person/place/thing

    @Column(name = "name", length=128)
    String name;

    //street address, p.o. box, company name, c/o
    @NotEmpty
    @MaxSkipEmpty(value=128)
    @Column(name = "line_1", length=128)
    String line1;

    //apt., suite, building, floor, entrance, etc.
    @Column(name = "line_2", length=128)
    String line2;

    @NotEmpty
    @MaxSkipEmpty(value=64)
    @Column(name = "city", length=64)
    String city;

    //state, providence, region
    @NotEmpty
    @MaxSkipEmpty(value=40)
    @Column(name = "state", length=40)
    String state;

    //postal code
    @NotEmpty
    @MaxSkipEmpty(value=16)
    @Column(name = "zip", length=16)
    String zip;

    @Column(name = "country")
    String country;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getLine1() {
        return line1;
    }

    public void setLine1(String line1) {
        this.line1 = line1;
    }

    public String getLine2() {
        return line2;
    }

    public void setLine2(String line2) {
        this.line2 = line2;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getState() {
        return state;
    }

    public void setState(String state) {
        this.state = state;
    }

    public String getZip() {
        return zip;
    }

    public void setZip(String zip) {
        this.zip = zip;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    private static final long serialVersionUID = -178898928354655555L;
}

---

@RequestMapping(value="user/{documentId}", method=RequestMethod.GET)
public @ResponseBody User getUserForDocument( Model model,     @PathVariable("documentId") Long docId){

    Document doc = null;
    try{
        doc = dService.find(docId);
    }catch(Exception e){
        Logger logger = Logger.getLogger(DocumentController.class);
        logger.error(e.getMessage());
    }
    User user = doc.getUser();

    user.getPerson();
    user.getPerson().getLocation();
    return user;
}

---

@Repository()
public class DocumentDaoImpl implements DocumentDao {

    @PersistenceContext
    private EntityManager entityManager;

    @Transactional
    public Document find(Long id) {

        Document doc = entityManager.find(Document.class, id);

        Hibernate.initialize(doc.getUser());
        Hibernate.initialize(doc.getUser().getPerson());
        Hibernate.initialize(doc.getUser().getPerson().getLocation());

        return doc;
    }

    @SuppressWarnings("unchecked")
    @Transactional
    public List<Document> getUnassignedDocumentsForUser(User user) {

        Query query = entityManager.createQuery(new StringBuffer()
                .append("select d from Document d WHERE d.user = :user ")
                .append("AND NOT d IN( SELECT d from Book b, IN(b.docs) bd WHERE bd.id = d.id )")
                .append("").toString());
        query.setParameter("user", user);
        List<Document> tmp = (ArrayList<Document>) query.getResultList();
        for(Document doc : tmp){
            Hibernate.initialize(doc);
            Hibernate.initialize(doc.getUser());
            Hibernate.initialize(doc.getUser().getPerson());
            Hibernate.initialize(doc.getUser().getPerson().getLocation());
            entityManager.detach(doc);
            entityManager.detach(doc.getUser());
            entityManager.detach(doc.getUser().getPerson());
            entityManager.detach(doc.getUser().getPerson().getLocation());
        }
        return tmp;
    }

    @Transactional
    public Document save(Document doc) {

        if (doc.getId() == null) {
            entityManager.persist(doc);
            return doc;
        } else {
            return entityManager.merge(doc);
        }
    }

    public EntityManager getEntityManager() {
        return entityManager;
    }

    public void setEntityManager(EntityManager entityManager) {
        this.entityManager = entityManager;
    }

}

ErrorExceptionResolver:

@Component
public class BWHandlerExceptionResolver extends SimpleMappingExceptionResolver implements InitializingBean{

    public void afterPropertiesSet() throws Exception {
        Properties props = new Properties();
        props.put(Exception.class.getName(),"error");
        this.setExceptionMappings(props);

    }