Question

我正在使用Spring MVC创建一个网站，并且为了持久性我使用Spring Data JPA和Hibernate 4作为我的JPA提供程序。目前正在使用Hibernate Validator处理验证。我有一个问题，我的验证器被调用两次，我无法弄清楚为什么。这是一个问题的主要原因是因为第二轮，依赖关系没有自动连接到验证器，我得到一个空指针异常。以下是导致失败的呼叫序列：

提交注册表单，首先调用NotDefaultSectValidator并成功完成用户对象上的'whereDidYouHearAboutUs'字段。
接下来调用UniqueUsernameValidator并成功完成“用户名”字段验证。
控制器上的'addUserFromForm'方法启动，并在bindingResults对象中找不到任何错误。
然后在UserService类上调用'addUser'方法。此方法到达'userRepository.save（user）;'行但之后不要立即运行'print.ln'行。单步执行此行将返回到“NotDefaultSectValidator”断点。这是第二次完成，我重新输入第二个验证器'UniqueUsernameValidator'。这里我得到一个空指针异常，因为出于某种原因，Spring第二次无法在DAO中自动装配。

任何人都可以阐明验证器被调用两次的原因，特别是为什么要跨越'userRepository.save（user）;'回到这些验证器？

非常感谢

这是我的user.java类

package com.dating.domain;

import java.util.HashSet;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.PrePersist;
import javax.persistence.PreUpdate;
import javax.persistence.Table;
import javax.persistence.Transient;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;

import org.hibernate.annotations.Type;
import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.NotEmpty;
import org.joda.time.LocalDate;
import org.springframework.format.annotation.DateTimeFormat;

import com.dating.annotation.NotDefaultSelect;
import com.dating.annotation.UniqueUsername;

@Entity
@Table(name = "dating.user")
public class User {

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

    @Column(name = "username", unique = true)
    @NotEmpty
    @Pattern(regexp = "^[a-zA-Z0-9]*$")
    @UniqueUsername
    private String username;

    @Column(name = "password", nullable = false)
    @NotEmpty
    @Size(min = 8)
    private String password;

    @Column(name = "first_name", nullable = false)
    @NotEmpty
    private String firstName;

    @Column(name = "last_name", nullable = false)
    @NotEmpty
    private String lastName;

    @Transient
    private String fullName;

    @Column(name = "email", nullable = false)
    @NotEmpty
    @Email
    private String email;

    @Column(name = "gender", nullable = false)
    @NotEmpty
    private String gender;

    @Column(name = "date_of_birth", nullable = false)
    @Type(type = "org.jadira.usertype.dateandtime.joda.PersistentLocalDate")
    @DateTimeFormat(pattern = "dd/MM/yyyy")
    private LocalDate dateOfBirth;

    @Column(name = "join_date", nullable = false)
    @Type(type = "org.jadira.usertype.dateandtime.joda.PersistentLocalDate")
    private LocalDate joinDate;

    @Column(name = "where_did_you_hear_about_us", nullable = false)
    @NotDefaultSelect
    private String whereDidYouHearAboutUs;

    @Column(name = "enabled")
    private boolean enabled;

    @ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinTable(name = "dating.user_roles", joinColumns = { @JoinColumn(name = "user_id", nullable = false, updatable = false) }, inverseJoinColumns = { @JoinColumn(name = "role_id", nullable = false, updatable = false) })
    private Set<Role> roles = new HashSet<Role>();

    @Column(name = "created_time", nullable = false)
    @Type(type = "org.jadira.usertype.dateandtime.joda.PersistentLocalDate")
    private LocalDate createdTime;

    @Column(name = "modification_time", nullable = false)
    @Type(type = "org.jadira.usertype.dateandtime.joda.PersistentLocalDate")
    private LocalDate modificationTime;

    public Long getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    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 getFullName() {
        return firstName + " " + lastName;
    }

    public void setFullName(String fullName) {
        this.fullName = fullName;
    }

    public String getEmail() {
        return email;
    }

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

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public LocalDate getDateOfBirth() {
        return dateOfBirth;
    }

    public void setDateOfBirth(LocalDate dateOfBirth) {
        this.dateOfBirth = dateOfBirth;
    }

    public LocalDate getJoinDate() {
        return joinDate;
    }

    public void setJoinDate(LocalDate joinDate) {
        this.joinDate = joinDate;
    }

    public String getWhereDidYouHearAboutUs() {
        return whereDidYouHearAboutUs;
    }

    public void setWhereDidYouHearAboutUs(String whereDidYouHearAboutUs) {
        this.whereDidYouHearAboutUs = whereDidYouHearAboutUs;
    }

    public boolean isEnabled() {
        return enabled;
    }

    public void setEnabled(boolean enabled) {
        this.enabled = enabled;
    }

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

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

    public void addRole(Role role) {
        roles.add(role);
    }

    public LocalDate getCreatedTime() {
        return createdTime;
    }

    public void setCreatedTime(LocalDate createdTime) {
        this.createdTime = createdTime;
    }

    public LocalDate getModificationTime() {
        return modificationTime;
    }

    public void setModificationTime(LocalDate modificationTime) {
        this.modificationTime = modificationTime;
    }

    @PreUpdate
    public void preUpdate() {
        modificationTime = new LocalDate();
    }

    @PrePersist
    public void prePersist() {
        LocalDate now = new LocalDate();
        createdTime = now;
        modificationTime = now;
    }
}

我的注册控制器中的相关方法：

@RequestMapping(value = "/register", method = RequestMethod.POST)
public String addUserFromForm(@Valid User user,
        BindingResult bindingResult, RedirectAttributes ra) {
    if (bindingResult.hasErrors()) {
        return "user/register";
    }
    userService.addUser(user);

    // Redirecting to avoid duplicate submission of the form
    return "redirect:/user/" + user.getUsername();
}

我的服务类：

package com.dating.service.impl;

import javax.transaction.Transactional;

import org.joda.time.LocalDate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.stereotype.Service;

import com.dating.domain.Role;
import com.dating.domain.User;
import com.dating.repository.RoleRepository;
import com.dating.repository.UserRepository;
import com.dating.repository.specification.UserSpecifications;
import com.dating.service.UserService;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserRepository userRepository;

    @Autowired
    private RoleRepository roleRepository;

    @Transactional
    @Override
    public void addUser(User user) {
        user.setJoinDate(new LocalDate());
        user.setEnabled(true);
        Role role = roleRepository.findByName(Role.MEMBER);
        if (role == null) {
            role = new Role();
            role.setName(Role.MEMBER);
        }
        user.addRole(role);
        BCryptPasswordEncoder encoder = new BCryptPasswordEncoder();
        user.setPassword(encoder.encode(user.getPassword()));
        userRepository.save(user);
        System.out.println("User Saved");
    }

    @Override
    public User getUserByUsername(String username) {
        return userRepository.findByUsername(username);
    }

    @Override
    public Iterable<User> getAllUsers() {
        return userRepository.findAll();
    }

    @Override
    public void updateDetails(User user) {
        userRepository.save(user);
    }

    @Override
    public Iterable<User> lastNameIsLike(String searchTerm) {
        return userRepository.findAll(UserSpecifications
                .lastNameIsLike(searchTerm));
    }
}

我的NotDefaultSelect验证器：

package com.dating.validator;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import com.dating.annotation.NotDefaultSelect;

public class NotDefaultSelectValidator implements
        ConstraintValidator<NotDefaultSelect, String> {
    @Override
    public void initialize(NotDefaultSelect constraint) {

    }

    @Override
    public boolean isValid(String selectedValue, ConstraintValidatorContext ctx) {
        if (selectedValue == null) {
            return false;
        }
        if (selectedValue.equals("") || selectedValue.equals("0")
                || selectedValue.equalsIgnoreCase("default")
                || selectedValue.equalsIgnoreCase("please select")) {
            return false;
        }
        return true;
    }

}

我的uniqueUsername验证器：

package com.dating.validator;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

import org.springframework.beans.factory.annotation.Autowired;

import com.dating.annotation.UniqueUsername;
import com.dating.repository.UserRepository;

public class UniqueUsernameValidator implements
        ConstraintValidator<UniqueUsername, String> {

    @Autowired
    private UserRepository userRepository;

    @Override
    public void initialize(UniqueUsername constraint) {

    }

    @Override
    public boolean isValid(String username, ConstraintValidatorContext ctx) {
        if (username == null || userRepository.findByUsername(username) == null) {
            return true;
        }
        return false;
    }

}

我的UserRepository：

package com.dating.repository;

import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.data.repository.CrudRepository;

import com.dating.domain.User;

//Spring Data JPA Marker interfaces being extended for automatic CRUD repository creation
public interface UserRepository extends CrudRepository<User, Long>, JpaSpecificationExecutor<User> {

    //Automatic query creation from method name
    public User findByUsername(String username);
}

最后是我的persistence-context.xml文件

<!-- Data source properties -->
<util:properties id="dataSourceSettings" location="classpath:datasource.properties" />

<!-- Pooled data source using BoneCP -->
<bean id="dataSource" class="com.jolbox.bonecp.BoneCPDataSource"
    destroy-method="close">
    <property name="driverClass" value="#{dataSourceSettings['jdbc.driverClass']}" />
    <property name="jdbcUrl" value="#{dataSourceSettings['jdbc.url']}" />
    <property name="username" value="#{dataSourceSettings['jdbc.username']}" />
    <property name="password" value="#{dataSourceSettings['jdbc.password']}" />
    <property name="idleConnectionTestPeriodInMinutes" value="60" />
    <property name="idleMaxAgeInMinutes" value="240" />
    <property name="maxConnectionsPerPartition" value="30" />
    <property name="minConnectionsPerPartition" value="10" />
    <property name="partitionCount" value="3" />
    <property name="acquireIncrement" value="5" />
    <property name="statementsCacheSize" value="100" />
    <property name="releaseHelperThreads" value="3" />
</bean>

<!-- JPA entity manager factory bean -->
<bean id="entityManagerFactory"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="packagesToScan" value="com.dating.domain" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
    </property>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.dialect">#{dataSourceSettings['hibernate.dialect']}</prop>
            <prop key="hibernate.hbm2ddl.auto">#{dataSourceSettings['hibernate.hbm2ddl.auto']}
            </prop>
            <prop key="hibernate.show_sql">#{dataSourceSettings['hibernate.show_sql']}</prop>
            <prop key="hibernate.format_sql">#{dataSourceSettings['hibernate.format_sql']}</prop>
            <prop key="hibernate.use_sql_comments">#{dataSourceSettings['hibernate.use_sql_comments']}
            </prop>
        </props>
    </property>
</bean>

<tx:annotation-driven transaction-manager="transactionManager" />

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>

<context:annotation-config />

<jpa:repositories base-package="com.dating.repository"/>

Answer 1

当您将bean发送到数据存储区时，可能第二次验证是由hibernate完成的。要将其关闭，请将其添加到persistence.xml：

<property name="javax.persistence.validation.mode" value="none"/>

https://docs.jboss.org/hibernate/entitymanager/3.5/reference/en/html/configuration.html说：

默认情况下，Bean Validation（和Hibernate Validator）已激活。创建，更新（并可选地删除）实体时，会在发送到数据库之前对其进行验证。 Hibernate生成的数据库模式也反映了在实体上声明的约束。

如果需要，您可以对其进行微调：

AUTO：如果类路径中存在Bean Validation，则激活CALLBACK和DDL。

CALLBACK：在创建，更新和删除时验证实体。如果不存在Bean Validation提供程序，则会在初始化时引发异常。

DDL :(非标准，见下文）数据库模式是在创建，更新和删除时验证实体。如果不存在Bean Validation提供程序，则会在初始化时引发异常。

NONE：根本不使用Bean验证

第一个显然是由Spring控制器完成的，因为@Valid注释。

Answer 2

您只需将此属性添加到application.property文件中即可禁用休眠验证spring.jpa.properties.javax.persistence.validation.mode=none

JSR303自定义验证器被调用两次

2 个答案: