Maven 2 如何让m2eclipse（Maven）指向；persistence.xml“；路径

我正在使用EclipseHelios、M2EclipseMaven插件和Glassfish插件。 我编辑了“pom.xml”文件，以便获得DerbyClient和JPA持久性类

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.apress.javaee6</groupId>
  <artifactId>chapter02</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>chapter02</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.apache.derby</groupId>
        <artifactId>derbyclient</artifactId>
        <version>10.6.1.0</version>
        <type>jar</type>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.eclipse.persistence</groupId>
        <artifactId>javax.persistence</artifactId>
        <version>2.0.0</version>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.eclipse.persistence</groupId>
        <artifactId>eclipselink</artifactId>
        <version>2.0.0</version>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-resources-plugin</artifactId>
        <version>2.4.3</version>
        <type>maven-plugin</type>
    </dependency>
  </dependencies>


  <build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.1</version>
            <configuration>
                <source>1.6</source>
                <target>1.6</target>
            </configuration>
        </plugin>
    </plugins>
  </build>
  <repositories>
    <repository>
      <id>EclipseLink Repo</id>
      <url>http://www.eclipse.org/downloads/download.php?r=1&amp;nf=1&amp;file=/rt/eclipselink/maven.repo</url>
    </repository>    
  </repositories>

</project>

主要功能如下：

package com.apress.javaee6.chapter02;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;

public class Main {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // Create an instance of book
        Book book = new Book();
        book.setTitle("The Hitchhiker's guide to the Galaxy");
        book.setPrice(12.5F);
        book.setDescription("Science fiction comedy book");
        book.setIsbn("1-84023-742-2");
        book.setIllustrations(false);

        // Gets an entity manager and a transaction
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("chapter02PU");
        EntityManager em = emf.createEntityManager();

        // Persists the book to the database
        EntityTransaction tx = em.getTransaction();

        try {
            tx.begin();
            em.persist(book);
            tx.commit();

            em.close();
            emf.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

问题是“persistence.xml”无法识别。 如何让Maven指向“persistence.xml”文件

当我激活Maven控制台和“更新依赖项”时，我得到了以下（错误）信息：

因此，我认为他试图在某个地方创建“资源”目录，但在构建之后无法获得它们

非常感谢；）

---

关于

如果您使用的是m2eclipse 0.10.0，那么未识别资源是一个已知问题（请参阅m2eclipse用户列表）。这里介绍了一种变通方法：

使用maven resources插件版本2.4.2或2.4.3也可能比2.4更好。

如果不告诉maven“指向”文件，则将文件放在最终位于类路径的目录中。对于资源，应该使用

src/main/resources

换句话说，只需将

persistence.xml

放在

src/main/resources/META-INF

中

---

我使用的是M2Eclipse0.10.0，我没有使用任何特殊的解决方法，它只适用于我工作区中至少3个jar、ejb和war类型的项目

根据JPA标准，persistence.xml应该位于META-INF文件夹的根目录中。因此，将其放入

src/main/resources/META-INF

应该可以工作

顺便说一句，您不需要依赖maven资源插件。请删除它。感谢Pascal在24小时内的第三次访问，您可以在这里看到：“src/main/resources”已经创建，并且“persistence.xml”已经存在。我不知道怎么了？再次感谢。@Zakaria：的确，我明白了（这在问题中并不明显）。您能否确认在Eclipse中构建时，

persistence.xml

不会被复制到

target/classes/META-INF

？在命令行上构建时，行为是否有所不同？如果是，那么你可能正面临@Bruno所描述的问题。我不能说太多，我自己也没有经历过这个问题。是的。我确认没有创建“resources”文件夹和“resources/META-INFO”目录以及“resources/META-INF/persistence.xml”。我在帖子中添加了一些打印在Maven控制台上的“信息”。对于命令行构建方法，我将在今晚晚些时候尝试，因为我的目标是拥有一个“紧凑”的开发环境，所以找不到解决方案。我已经试过使用Netbeans，它是现成的。再次感谢；）

package com.apress.javaee6.chapter02; 

import javax.persistence.*;
@Entity
@NamedQuery(name="findAllBooks", query="SELECT b from Book b") 
public class Book {
    @Id @GeneratedValue
    private Long id;
    @Column(nullable = false)
    private String  title;
    private float   price;
    @Column(length = 1000)
    private String  description;
    private String  isbn;
    private Integer nbOfPage;
    private Boolean illustrations;

    public Book() {
        super();
    }
    public Book(Long id, String title, float price, String description,
            String isbn, Integer nbOfPage, Boolean illustrations) {
        super();
        this.id = id;
        this.title = title;
        this.price = price;
        this.description = description;
        this.isbn = isbn;
        this.nbOfPage = nbOfPage;
        this.illustrations = illustrations;
    }
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public float getPrice() {
        return price;
    }
    public void setPrice(float price) {
        this.price = price;
    }
    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }
    public String getIsbn() {
        return isbn;
    }
    public void setIsbn(String isbn) {
        this.isbn = isbn;
    }
    public Integer getNbOfPage() {
        return nbOfPage;
    }
    public void setNbOfPage(Integer nbOfPage) {
        this.nbOfPage = nbOfPage;
    }
    public Boolean getIllustrations() {
        return illustrations;
    }
    public void setIllustrations(Boolean illustrations) {
        this.illustrations = illustrations;
    }


}

package com.apress.javaee6.chapter02;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;

public class Main {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // Create an instance of book
        Book book = new Book();
        book.setTitle("The Hitchhiker's guide to the Galaxy");
        book.setPrice(12.5F);
        book.setDescription("Science fiction comedy book");
        book.setIsbn("1-84023-742-2");
        book.setIllustrations(false);

        // Gets an entity manager and a transaction
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("chapter02PU");
        EntityManager em = emf.createEntityManager();

        // Persists the book to the database
        EntityTransaction tx = em.getTransaction();

        try {
            tx.begin();
            em.persist(book);
            tx.commit();

            em.close();
            emf.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

28/06/10 15:20:36 CEST: [INFO] Using 'UTF-8' encoding to copy filtered resources.
28/06/10 15:20:36 CEST: [INFO] skip non existing resourceDirectory /home/zakaria/workspace/chapter02/src/main/resources
28/06/10 15:20:36 CEST: [INFO] Using 'UTF-8' encoding to copy filtered resources.
28/06/10 15:20:36 CEST: [INFO] skip non existing resourceDirectory /home/zakaria/workspace/chapter02/src/test/resources