JBoss7.1.0: 在子部署中找不到名为 null 的持久性单元

Question

我有一个项目，里面有 3 个模块：factory-ear、factory-ejb 和 factory-web。它作为 EAR 部署到 JBoss7，其中包含 ejb.jar 和 web.war。当我试图在我的 EJB 中获取 EntityManager 时 class

@PersistenceContext(unitName = "manager1")
private EntityManager em;

我收到错误

JBAS011440: Can't find a persistence unit named manager1 in subdeployment "factory-ejb-1.0-SNAPSHOT.jar" of deployment "factory.ear"

我的persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
    xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
    <persistence-unit name="manager1" transaction-type="JTA">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <jta-data-source>java:jboss/datasources/PostgresDS</jta-data-source>
        <class>com.test.model.Car</class>
        <class>com.test.model.Engine</class>
        <class>com.test.model.Body</class>
        <class>com.test.model.Transmission</class>
        <properties>
         <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
         <property name="hibernate.show_sql" value="true" />
         <property name="hibernate.hbm2ddl.auto" value="update"/>
        </properties>
    </persistence-unit>
</persistence>

persistence.xml在app_name/factory_ear/META-INF.

我了解到这可能是 classloader 的问题。我在 ear 和 web 模块中具有相同的 JPA API 依赖关系

  <dependency>
     <groupId>org.hibernate.javax.persistence</groupId>
     <artifactId>hibernate-jpa-2.0-api</artifactId>
     <scope>provided</scope>
  </dependency>

但我无法删除其中一个。两者都是构建所必需的。

Body.java

@Entity
@Table(name = "body")
public class Body {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Integer id;

    @Column(name = "type")
    private String type;

    @Column(name = "color")
    private String color;

    @Column(name = "doors_num")
    private Integer doorsNumber;

    @Column(name = "vin")
    private Integer vin;

    @OneToMany(mappedBy = "body")
    private Set<Car> cars;

    /**
     * @return the id
     */
    public Integer getId() {
        return id;
    }

    /**
     * @param id the id to set
     */
    public void setId(Integer id) {
        this.id = id;
    }

    /**
     * @return the type
     */
    public String getType() {
        return type;
    }

    /**
     * @param type the type to set
     */
    public void setType(String type) {
        this.type = type;
    }

    /**
     * @return the color
     */
    public String getColor() {
        return color;
    }

    /**
     * @param color the color to set
     */
    public void setColor(String color) {
        this.color = color;
    }

    /**
     * @return the doorsNumber
     */
    public Integer getDoorsNumber() {
        return doorsNumber;
    }

    /**
     * @param doorsNumber the doorsNumber to set
     */
    public void setDoorsNumber(Integer doorsNumber) {
        this.doorsNumber = doorsNumber;
    }

    /**
     * @return the vin
     */
    public Integer getVin() {
        return vin;
    }

    /**
     * @param vin the vin to set
     */
    public void setVin(Integer vin) {
        this.vin = vin;
    }

    /**
     * @return the cars
     */
    public Set<Car> getCars() {
        return cars;
    }

    /**
     * @param cars the cars to set
     */
    public void setCars(Set<Car> cars) {
        this.cars = cars;
    }
}

Car.java

public class Car {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Integer id;

    @Column(name = "model")
    private String model;

    @ManyToOne
    @JoinColumn(name = "engine_id")
    private Engine engine;

    @ManyToOne
    @JoinColumn(name = "body_id")
    private Body body;

    @ManyToOne
    @JoinColumn(name = "transmission_id")
    private Transmission transmission;

    /**
     * @return the id
     */
    public Integer getId() {
        return id;
    }

    /**
     * @param id the id to set
     */
    public void setId(Integer id) {
        this.id = id;
    }

    /**
     * @return the model
     */
    public String getModel() {
        return model;
    }

    /**
     * @param model the model to set
     */
    public void setModel(String model) {
        this.model = model;
    }

    /**
     * @return the engine
     */
    public Engine getEngine() {
        return engine;
    }

    /**
     * @param engine the engine to set
     */
    public void setEngine(Engine engine) {
        this.engine = engine;
    }

    /**
     * @return the body
     */
    public Body getBody() {
        return body;
    }

    /**
     * @param body the body to set
     */
    public void setBody(Body body) {
        this.body = body;
    }

    /**
     * @return the transmission
     */
    public Transmission getTransmission() {
        return transmission;
    }

    /**
     * @param transmission the transmission to set
     */
    public void setTransmission(Transmission transmission) {
        this.transmission = transmission;
    }
}

Answer 1

这个问题不是你的maven依赖引起的。

任何 class 加载器通常无法访问 EAR 文件中 META-INF 目录的内容。

因此，您不能将 persistence.xml 文件放在 EAR 文件的 META-INF 目录中。而是将其移动到 EJB jar 文件的 META-INF 目录中。

JBoss7.1.0: 在子部署中找不到名为 null 的持久性单元

JBoss7.1.0: Can't find a persistence unit named null in subdeployment

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