Ich verwende JHipster und führe den folgenden Curl-Befehl aus:
POST / API / Gang-Benutzer
mit Körper:
{
"role": "member",
"gang": "3",
"user": "1"
}
aber ich bekomme folgenden Fehler:
JSON-Analysefehler: Instanz von
com.getgreetapp.greetapp.domain.User
(obwohl mindestens ein Creator vorhanden ist) kann nicht erstellt werden: Kein Konstruktor / Factory-Methode für String-Argumente zum Deserialisieren vom String-Wert ('1'); verschachtelte Ausnahme ist com.fasterxml.jackson.databind.exc.MismatchedInputException: Instanz voncom.getgreetapp.greetapp.domain.User
(obwohl mindestens ein Creator vorhanden ist) kann nicht erstellt werden: kein Konstruktor / Factory-Methode für String-Argumente zum Deserialisieren vom String-Wert ('1') \ n bei [ Quelle: (PushbackInputStream); Zeile: 4, Spalte: 10] (über die Referenzkette: com.getgreetapp.greetapp.domain.GangUser ["Benutzer"))
GangUserResource createGangUser
@PostMapping("/gang-users")
@Timed
public ResponseEntity<GangUser> createGangUser(@Valid @RequestBody GangUser gangUser) throws URISyntaxException {
log.debug("REST request to save GangUser : {}", gangUser);
if (gangUser.getId() != null) {
throw new BadRequestAlertException("A new gangUser cannot already have an ID", ENTITY_NAME, "idexists");
}
User user = userRepository.findById(gangUser.getUser());
GangUser result = gangUserRepository.save(gangUser);
return ResponseEntity.created(new URI("/api/gang-users/" + result.getId()))
.headers(HeaderUtil.createEntityCreationAlert(ENTITY_NAME, result.getId().toString()))
.body(result);
}
GangUser
package com.getgreetapp.greetapp.domain;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;
import javax.persistence.*;
import javax.validation.constraints.*;
import java.io.Serializable;
import java.util.Objects;
/**
* A GangUser.
*/
@Entity
@Table(name = "gang_user")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class GangUser implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@NotNull
@Column(name = "jhi_role", nullable = false)
private String role;
@ManyToOne
private Gang gang;
@ManyToOne
private User user;
public GangUser() {
}
public GangUser(String role, Gang gang, User user)
{
this.role = role;
this.gang = gang;
this.user = user;
}
// jhipster-needle-entity-add-field - JHipster will add fields here, do not remove
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getRole() {
return role;
}
public GangUser role(String role) {
this.role = role;
return this;
}
public void setRole(String role) {
this.role = role;
}
public Gang getGang() {
return gang;
}
public GangUser gang(Gang gang) {
this.gang = gang;
return this;
}
public void setGang(Gang gang) {
this.gang = gang;
}
public User getUser() {
return user;
}
public GangUser user(User user) {
this.user = user;
return this;
}
public void setUser(User user) {
this.user = user;
}
// jhipster-needle-entity-add-getters-setters - JHipster will add getters and setters here, do not remove
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
GangUser gangUser = (GangUser) o;
if (gangUser.getId() == null || getId() == null) {
return false;
}
return Objects.equals(getId(), gangUser.getId());
}
@Override
public int hashCode() {
return Objects.hashCode(getId());
}
@Override
public String toString() {
return "GangUser{" +
"id=" + getId() +
", role='" + getRole() + "'" +
"}";
}
}
Benutzer
package com.getgreetapp.greetapp.domain;
import com.getgreetapp.greetapp.config.Constants;
import com.fasterxml.jackson.annotation.JsonIgnore;
import org.apache.commons.lang3.StringUtils;
import org.hibernate.annotations.BatchSize;
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;
import javax.validation.constraints.Email;
import javax.persistence.*;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Locale;
import java.util.Objects;
import java.util.Set;
import java.time.Instant;
/**
* A user.
*/
@Entity
@Table(name = "jhi_user")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class User extends AbstractAuditingEntity implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@NotNull
@Pattern(regexp = Constants.LOGIN_REGEX)
@Size(min = 1, max = 50)
@Column(length = 50, unique = true, nullable = false)
private String login;
@JsonIgnore
@NotNull
@Size(min = 60, max = 60)
@Column(name = "password_hash", length = 60, nullable = false)
private String password;
@Size(max = 50)
@Column(name = "first_name", length = 50)
private String firstName;
@Size(max = 50)
@Column(name = "last_name", length = 50)
private String lastName;
@Email
@Size(min = 5, max = 254)
@Column(length = 254, unique = true)
private String email;
@NotNull
@Column(nullable = false)
private boolean activated = false;
@Size(min = 2, max = 6)
@Column(name = "lang_key", length = 6)
private String langKey;
@Size(max = 256)
@Column(name = "image_url", length = 256)
private String imageUrl;
@Size(max = 20)
@Column(name = "activation_key", length = 20)
@JsonIgnore
private String activationKey;
@Size(max = 20)
@Column(name = "reset_key", length = 20)
@JsonIgnore
private String resetKey;
@Column(name = "reset_date")
private Instant resetDate = null;
@JsonIgnore
@ManyToMany
@JoinTable(
name = "jhi_user_authority",
joinColumns = {@JoinColumn(name = "user_id", referencedColumnName = "id")},
inverseJoinColumns = {@JoinColumn(name = "authority_name", referencedColumnName = "name")})
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
@BatchSize(size = 20)
private Set<Authority> authorities = new HashSet<>();
public User() {}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getLogin() {
return login;
}
// Lowercase the login before saving it in database
public void setLogin(String login) {
this.login = StringUtils.lowerCase(login, Locale.ENGLISH);
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
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 String getImageUrl() {
return imageUrl;
}
public void setImageUrl(String imageUrl) {
this.imageUrl = imageUrl;
}
public boolean getActivated() {
return activated;
}
public void setActivated(boolean activated) {
this.activated = activated;
}
public String getActivationKey() {
return activationKey;
}
public void setActivationKey(String activationKey) {
this.activationKey = activationKey;
}
public String getResetKey() {
return resetKey;
}
public void setResetKey(String resetKey) {
this.resetKey = resetKey;
}
public Instant getResetDate() {
return resetDate;
}
public void setResetDate(Instant resetDate) {
this.resetDate = resetDate;
}
public String getLangKey() {
return langKey;
}
public void setLangKey(String langKey) {
this.langKey = langKey;
}
public Set<Authority> getAuthorities() {
return authorities;
}
public void setAuthorities(Set<Authority> authorities) {
this.authorities = authorities;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
User user = (User) o;
return !(user.getId() == null || getId() == null) && Objects.equals(getId(), user.getId());
}
@Override
public int hashCode() {
return Objects.hashCode(getId());
}
@Override
public String toString() {
return "User{" +
"login='" + login + '\'' +
", firstName='" + firstName + '\'' +
", lastName='" + lastName + '\'' +
", email='" + email + '\'' +
", imageUrl='" + imageUrl + '\'' +
", activated='" + activated + '\'' +
", langKey='" + langKey + '\'' +
", activationKey='" + activationKey + '\'' +
"}";
}
}
Gang
package com.getgreetapp.greetapp.domain;
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;
import javax.persistence.*;
import javax.validation.constraints.*;
import java.io.Serializable;
import java.math.BigDecimal;
import java.util.Objects;
/**
* A Gang.
*/
@Entity
@Table(name = "gang")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class Gang implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@NotNull
@Column(name = "name", nullable = false)
private String name;
@NotNull
@Column(name = "description", nullable = false)
private String description;
@NotNull
@Column(name = "longitude", precision = 10, scale = 2, nullable = false)
private BigDecimal longitude;
@NotNull
@Column(name = "latitude", precision = 10, scale = 2, nullable = false)
private BigDecimal latitude;
@NotNull
@Column(name = "membership_approval", nullable = false)
private String membershipApproval;
@NotNull
@Column(name = "privacy", nullable = false)
private String privacy;
public Gang() {}
// jhipster-needle-entity-add-field - JHipster will add fields here, do not remove
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public Gang name(String name) {
this.name = name;
return this;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public Gang description(String description) {
this.description = description;
return this;
}
public void setDescription(String description) {
this.description = description;
}
public BigDecimal getLongitude() {
return longitude;
}
public Gang longitude(BigDecimal longitude) {
this.longitude = longitude;
return this;
}
public void setLongitude(BigDecimal longitude) {
this.longitude = longitude;
}
public BigDecimal getLatitude() {
return latitude;
}
public Gang latitude(BigDecimal latitude) {
this.latitude = latitude;
return this;
}
public void setLatitude(BigDecimal latitude) {
this.latitude = latitude;
}
public String getMembershipApproval() {
return membershipApproval;
}
public Gang membershipApproval(String membershipApproval) {
this.membershipApproval = membershipApproval;
return this;
}
public void setMembershipApproval(String membershipApproval) {
this.membershipApproval = membershipApproval;
}
public String getPrivacy() {
return privacy;
}
public Gang privacy(String privacy) {
this.privacy = privacy;
return this;
}
public void setPrivacy(String privacy) {
this.privacy = privacy;
}
// jhipster-needle-entity-add-getters-setters - JHipster will add getters and setters here, do not remove
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Gang gang = (Gang) o;
if (gang.getId() == null || getId() == null) {
return false;
}
return Objects.equals(getId(), gang.getId());
}
@Override
public int hashCode() {
return Objects.hashCode(getId());
}
@Override
public String toString() {
return "Gang{" +
"id=" + getId() +
", name='" + getName() + "'" +
", description='" + getDescription() + "'" +
", longitude=" + getLongitude() +
", latitude=" + getLatitude() +
", membershipApproval='" + getMembershipApproval() + "'" +
", privacy='" + getPrivacy() + "'" +
"}";
}
}
Meiner bescheidenen Meinung nach gibt es ein paar Dinge zu überprüfen.
Erstens wird nicht empfohlen, dasselbe Objekt zum Speichern von Daten in Ihrer Datenbank und zum Beantworten einer Anfrage zu verwenden. Das Datenobjekt kann GangUser, User und Gang sein, während die Antwortobjekte GangUserApi, UserApi und GangApi sind. Mit diesem Ansatz können Sie eine Ebene ändern, ohne eine andere zu ändern.
Zweitens erwartet Ihr Dienst einen GangUser mit einem Benutzer im Inneren. Das gleiche Benutzerobjekt, mit dem Sie es in der Datenbank speichern. Sie senden dort nur einen String ("1") anstelle eines Objekts.
Eine schnelle Lösung könnte darin bestehen, den JSON zu ändern:
{
"role": "member",
"gang": "3",
"user": {
"id":"1"
}
}
Aber ich würde gerne wissen, ob Sie verstehen, was los war. Das ist wichtiger als nur eine schnelle Lösung.
Prost.
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