JPA實體被忽略

Question

我正在嘗試在項目中第一次使用JPA。 我的大多數實體都工作正常，但是我遇到了一個問題，該實體是Joined Inheritance Strategy的一部分.Jackson也正在對這些實體進行序列化，因此它們也具有Json批注。

父級“用戶”類：（編輯：添加了“類型”字段）

@JsonTypeInfo(use=JsonTypeInfo.Id.NAME, include= JsonTypeInfo.As.WRAPPER_OBJECT)
@JsonTypeName("user")
@JsonSubTypes({
        @JsonSubTypes.Type(name="customer", value=Customer.class),
        @JsonSubTypes.Type(name="employee", value=Employee.class)})
@Entity(name = "User")
@Table(name="user")
@Inheritance(strategy = InheritanceType.JOINED)
@DiscriminatorColumn(name="type",discriminatorType = DiscriminatorType.INTEGER)
@NamedQuery(name="User.all",query = "select u from User u")
public abstract class User {

    @Id
    private String username;
    @Column(name = "type",nullable = false)
    private int type;

    public User(){

    }

    public int getType() {
        return type;
    }

    public void setType(int type) {
        this.type = type;
    }

    public String getUsername() {
        return username;
    }

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

    public abstract Set<Order> getOrders();
}

一個孩子“雇員”

@JsonTypeName("employee")
@Entity(name="Employee")
@Table(name="employee")
@PrimaryKeyJoinColumn(name = "username",referencedColumnName = "username")
@DiscriminatorValue("1")
@NamedQuery(name = "Employee.all",query = "select e from Employee e")
public class Employee extends User implements Serializable{

    private String username;
    private String firstName;
    private String lastName;
    private String email;
    @Convert(converter = LocalDatePersistenceConverter.class)
    private LocalDate dateStarted;
    @Convert(converter = LocalDatePersistenceConverter.class)
    private LocalDate dateEnded;

    @OneToMany(mappedBy = "employee",targetEntity = Order.class,fetch = FetchType.EAGER,cascade = CascadeType.PERSIST)
    @JsonIgnore
    private Set<Order> orders = new HashSet<>();

    public Employee() {

    }

    @Override
    public Set<Order> getOrders() {
        return orders;
    }

    public void setOrders(Set<Order> orders) {
        this.orders = orders;
    }

    public void addOrder(Order order){
        orders.add(order);
    }

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

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

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

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public String getEmail() {
        return email;
    }

    public String getDateStarted() {
        if(dateStarted != null)
            return dateStarted.toString();
        else return null;
    }

    public void setDateStarted(LocalDate dateStarted) {
        this.dateStarted = dateStarted;
    }

    public String getDateEnded() {
        if(dateEnded != null)
            return dateEnded.toString();
        else return null;
    }

    public void setDateEnded(LocalDate dateEnded) {
        this.dateEnded = dateEnded;
    }

    @Override
    public String toString(){
        return getUsername();
    }
}

還有一個子“客戶” ：（編輯：已刪除@Id字段）

@JsonTypeName("customer")
@Entity(name="Customer")
@Table(name="customer")
@PrimaryKeyJoinColumn(name = "username",referencedColumnName = "username")
@DiscriminatorValue("2")
@NamedQueries({
        @NamedQuery(name="Customer.all",query = "select c from Customer c")
})
public class Customer extends User implements Serializable{

    public enum VIP_TYPE {NORMAL,SILVER,GOLD,DIAMOND}

    @Transient
    private static final int SILVER_THRESHOLD = 1000;
    @Transient
    private static final int GOLD_THRESHOLD = 2000;
    @Transient
    private static final int DIAMOND_THRESHOLD = 3000;

    private String firstName;
    private String lastName;
    private String email;
    private String address;
    private String postcode;
    private String mobileNumber;
    private String homeNumber;
    @Convert(converter = VipTypeConverter.class)
    private VIP_TYPE vipGroup;
    private String discount;

    @OneToMany(mappedBy = "customer",targetEntity = Order.class,fetch=FetchType.EAGER,cascade = CascadeType.ALL)
    @JsonIgnore
    private Set<Order> orders = new HashSet<>();

    public Customer() {
    }

    @Override
    public Set<Order> getOrders() {
        return orders;
    }

    public void setOrders(Set<Order> orders) {
        this.orders = orders;
    }

    public void addOrder(final Order order){
        orders.add(order);
        updateVipGroup();
    }

    private void updateVipGroup() {
        int sum = orders.stream().map(Order::getPayment).distinct().mapToInt(p->p.getAmmount()).sum();
        if(sum > DIAMOND_THRESHOLD){
            vipGroup = VIP_TYPE.DIAMOND;
            return;
        }
        if(sum > GOLD_THRESHOLD){
            vipGroup = VIP_TYPE.GOLD;
            return;
        }
        if(sum > SILVER_THRESHOLD){
            vipGroup = VIP_TYPE.SILVER;
            return;
        }
    }

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

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

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

    public void setAddress(String address) {
        this.address = address;
    }

    public void setDiscount(String discount) {
        this.discount = discount;
    }

    public void setVipGroup(VIP_TYPE vipGroup) {
        this.vipGroup = vipGroup;
    }

    public void setHomeNumber(String homeNumber) {
        this.homeNumber = homeNumber;
    }

    public void setMobileNumber(String mobileNumber) {
        this.mobileNumber = mobileNumber;
    }

    public void setPostcode(String postcode) {
        this.postcode = postcode;
    }

    public String getDiscount() {
        return discount;
    }

    public VIP_TYPE getVipGroup() {
        return vipGroup;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public String getEmail() {
        return email;
    }

    public String getAddress() {
        return address;
    }

    public String getPostcode() {
        return postcode;
    }

    public String getMobileNumber() {
        return mobileNumber;
    }

    public String getHomeNumber() {
        return homeNumber;
    }

}

persistence.xml中

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence">
    <persistence-unit name="local" transaction-type="JTA">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <jta-data-source>jdbc/cod</jta-data-source>
        <class>com.technicalpioneers.cod.user.Customer</class>
        <class>com.technicalpioneers.cod.user.Employee</class>
        <class>com.technicalpioneers.cod.user.User</class>
        <exclude-unlisted-classes>false</exclude-unlisted-classes>
    </persistence-unit>
</persistence>

與“雇員”工作文件有關的所有事情，我都可以使用命名查詢Employee.all在數據庫中查找所有雇員。

但是，如果我嘗試檢索任何客戶，則會出錯。 如果我嘗試運行命名查詢Customer.all則會得到：

java.lang.IllegalArgumentException: NamedQuery of name: Customer.all not found.

如果我嘗試使用EntityManager的find（）方法來查找特定客戶，則會得到：

javax.servlet.ServletException: Exception [EclipseLink-43] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Missing class for indicator field value [2] of type [class java.lang.Integer].
Descriptor: RelationalDescriptor(com.technicalpioneers.cod.user.User --> [DatabaseTable(user)])

我不明白為什么JPA找不到客戶實體。 我檢查了用戶表，“類型”列中有正確的數字，並且@DescriminatorValue設置正確。 幾乎就像注釋被忽略了嗎？

也做了許多干凈的改建和重新部署。 任何幫助將不勝感激！

Answer 1

我終於找到了。 https://bugs.eclipse.org/bugs/show_bug.cgi?id=429992事實證明EclipseLink會默默地忽略帶有lambda表達式的實體！ 至少在日志中沒有提到它很煩人！

感謝所有花時間的人！