Question

我正在使用Spring 4创建一个应用程序，Hibernate 4具有Spring安全性

用户已经为他们分配了角色，但是当我尝试创建用户时，它无法保存用户，而是在角色字段下方的浏览器上给我例外

Failed to convert property value of type [java.lang.String[]] to required type [java.util.Set] for property userRoles; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type

[@ org.hibernate.validator.constraints.NotEmpty @javax.persistence.ManyToMany @javax.persistence.JoinTable com.himanshu.blogger.model.Role] for value 2;嵌套异常是java.lang.StackOverflowError

我的用户模型类

@Entity
@Table(name = "BLOG_USER")
public class User {

    @Id
    @Column(name = "USER_ID")
    private String userId;

    @NotEmpty
    @Column(name = "PASSWORD")
    private String password;

    @NotEmpty
    @Column(name = "FIRST_NAME")
    private String firstName;

    @NotEmpty
    @Column(name = "MIDDLE_NAME")
    private String middleName;

    @NotEmpty
    @Column(name = "LAST_NAME")
    private String lastName;

    @Column(name = "EMAIL")
    private String email;

    @Column(name = "PHONE")
    private String phone;

    @NotNull
    @Column(name = "STATE")
    private Integer state = State.ACTIVE.getState();

    @Transient
    private String stateName;

    @NotEmpty
    @ManyToMany(fetch = FetchType.LAZY)
    @JoinTable(name = "USER_ROLE_MAP", joinColumns = { @JoinColumn(name = "USER_ID") }, inverseJoinColumns = {
            @JoinColumn(name = "ROLE_ID") })
    private Set<Role> userRoles = new HashSet<>();

/*skipped getter, setters and some utility methods*/

角色模型类

@Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="ROLE_ID")
    private Integer roleId;

    @Column(name="ROLE_TYPE", length=20, nullable=false, unique=true)
    private String roleType=RoleType.USER.getRoleType();
/*skipped getters and setters*/

我在这里注册新用户的控制器方法我还添加了一个模型属性来加载注册表格中的角色

/**
     * This method will provide the medium to add a new user. 
     * By GET method it will identify that it has to load registration page
     */
    @RequestMapping(value = { "/newuser" }, method = RequestMethod.GET)
    public String newUser(ModelMap model) {
        User user = new User();
        model.addAttribute("user", user);
        model.addAttribute("edit", false);
        return "registration";
    }

    /**
     * This method will be called on form submission, handling POST request for
     * saving user in database. It also validates the user input
     */
    @RequestMapping(value = { "/newuser" }, method = RequestMethod.POST)
    public String saveUser(@Valid User user, BindingResult result, ModelMap model) {

            System.out.println("save user : "+user);
            if (result.hasErrors()) {
                return "registration";
            }

            if(!userService.isUniqueUser(user.getUserId())){
                FieldError userIdError =new FieldError("user","userId",messageSource.getMessage("non.unique.ssoId", new String[]{user.getUserId()}, Locale.getDefault()));
                result.addError(userIdError);
                return "registration";
            }

            userService.saveUser(user);

            model.addAttribute("success", "User " + user.getFirstName() + " "+ user.getLastName() + " registered successfully");

        //return "success";
        return "registrationsuccess";
    }

@ModelAttribute("blogRoleList")
    public List<Role> initializeProfiles() {
        return roleService.findAll();
    }

我已注册转换器以将角色ID转换为角色对象

@Component
public class RoleIdtoRoleConverter implements Converter<Object, Role> {

    @Autowired
    RoleService roleService;

    public Role convert(Object roleIdObj) {

        System.out.println("covertor called with id " + roleIdObj.toString());
        Integer roleId = -1;
        try {
            roleId = Integer.parseInt((String) roleIdObj);
        } catch (NumberFormatException e) {
            throw new ConversionFailedException(TypeDescriptor.valueOf(String.class),
                    TypeDescriptor.valueOf(Role.class), roleIdObj, null);
        }

        System.out.println("covertor called with id " + roleIdObj.toString());

        Role role = roleService.findRoleById(roleId);
        System.out.println("Role = " + role);

        return role;
    }

在我的配置类中注册了这个转换器

@Autowired
    RoleIdtoRoleConverter roleIdToRoleConverter;

    public void addFormatters(FormatterRegistry registry) {
        registry.addConverter(roleIdToRoleConverter);
    }

注册JSP文件registration.jsp

<form:form method="POST" modelAttribute="user" class="form-horizontal">
<%--        <form:input type="hidden" path="userId" id="useId"/> --%>

        <div class="row">
            <div class="form-group col-md-12">
                <label class="col-md-3 control-lable" for="firstName">First Name</label>
                <div class="col-md-7">
                    <form:input type="text" path="firstName" id="firstName" class="form-control input-sm"/>
                    <div class="has-error">
                        <form:errors path="firstName" class="help-inline"/>
                    </div>
                </div>
            </div>
        </div>

        <div class="row">
            <div class="form-group col-md-12">
                <label class="col-md-3 control-lable" for="lastName">Last Name</label>
                <div class="col-md-7">
                    <form:input type="text" path="lastName" id="lastName" class="form-control input-sm" />
                    <div class="has-error">
                        <form:errors path="lastName" class="help-inline"/>
                    </div>
                </div>
            </div>
        </div>

        <div class="row">
            <div class="form-group col-md-12">
                <label class="col-md-3 control-lable" for="userId">User ID</label>
                <div class="col-md-7">
                    <c:choose>
                        <c:when test="${edit}">
                            <form:input type="text" path="userId" id="userId" class="form-control input-sm" disabled="true"/>
                        </c:when>
                        <c:otherwise>
                            <form:input type="text" path="userId" id="userId" class="form-control input-sm" />
                            <div class="has-error">
                                <form:errors path="userId" class="help-inline"/>
                            </div>
                        </c:otherwise>
                    </c:choose>
                </div>
            </div>
        </div>
        <c:if test="${!edit}">
            <div class="row">
                <div class="form-group col-md-12">
                    <label class="col-md-3 control-lable" for="password">Password</label>
                    <div class="col-md-7">
                        <form:input type="password" path="password" id="password" class="form-control input-sm" />
                        <div class="has-error">
                            <form:errors path="password" class="help-inline"/>
                        </div>
                    </div>
                </div>
            </div>
        </c:if>


        <div class="row">
            <div class="form-group col-md-12">
                <label class="col-md-3 control-lable" for="email">Email</label>
                <div class="col-md-7">
                    <form:input type="text" path="email" id="email" class="form-control input-sm" />
                    <div class="has-error">
                        <form:errors path="email" class="help-inline"/>
                    </div>
                </div>
            </div>
        </div>

        <div class="row">
            <div class="form-group col-md-12">
                <label class="col-md-3 control-lable" for="userRoles">Roles</label>
                <div class="col-md-7">
                    <form:select path="userRoles" items="${blogRoleList}" multiple="true" itemValue="roleId" itemLabel="roleType" class="form-control input-sm" />
                    <div class="has-error">
                        <form:errors path="userRoles" class="help-inline"/>
                    </div>
                </div>
            </div>
        </div>

        <div class="row">
            <div class="form-actions floatRight" style="margin-left: 25px">
                <c:choose>
                    <c:when test="${edit}">
                        <input type="submit" value="Update" class="btn btn-primary btn-sm"/> or <a href="<c:url value='/listUser' />">Cancel</a>
                    </c:when>
                    <c:otherwise>
                        <input type="submit" value="Register" class="btn btn-primary btn-sm"/> or <a href="<c:url value='/listUser' />">Cancel</a>
                    </c:otherwise>
                </c:choose>
            </div>
        </div>
    </form:form>

但是我无法弄清楚它是不是能够保存数据，我已经在控制器中打印了用户对象它将角色显示为空白数组，我在这里遗漏了一些东西，无法得到，任何帮助并且会得到建议。

添加用于保存用户的代码

抽象dao类

public class AbstractDao <PK extends Serializable, T>{

    private final Class<T> persistantClass;

    @Autowired
    SessionFactory sessionFactory;

    @SuppressWarnings("unchecked")
    public AbstractDao() {
        this.persistantClass=(Class<T>)((ParameterizedType)this.getClass().getGenericSuperclass()).getActualTypeArguments()[1];
    }

    public void persistEntity(T entity) {
        this.getSession().persist(entity);
    }
    /* mor emethods to load data on based on object type */
}

用户Dao implimentation calss

@Repository("userDao")
public class UserDaoImpl extends AbstractDao<String, User> implements  UserDao{
    @Override
    public void saveUser(User user) {
        persistEntity(user);

    }
    /* more methods for fetching data from db*/
}

感谢。

Answer 1

我的应用程序出了问题。问题出在dao方法中，从DB获取role对象，在编写代码时我错误地调用了同样的方法，该方法以递归方式执行，因此convertor无法从DB获取role对象。

无法持久映射到用户的角色

1 个答案: