glassfish-3 - 将 DataNucleus 与 Glassfish 3.x 结合使用

Question

我在使用 DataNucleus 作为 Glassfish AS 上的 ORM 框架时遇到了问题。实际上我正在尝试使用连接到 MongoDb。我预计这里会出现问题，因为每个人都知道 nosql 数据库不是标准的一部分，但我遇到了使用 DataNucleus 的问题。这是我没想到的。我对 DataNucleus 和 MongoDB 都不熟悉，不幸的是我未能在 WEB 上找到任何相关信息，所以我决定逐步进行。

我创建了一个小型命令行应用程序，它使用 DataNucleus 和 MongoDB 并使用 Maven 构建。相关代码如下

坚持.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
             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_1_0.xsd">
    <persistence-unit name="just_test">
        <provider>org.datanucleus.api.jpa.PersistenceProviderImpl</provider>

        <properties>
            <property name="datanucleus.ConnectionURL" value="mongodb:/justtest"/>
            <property name="datanucleus.autoCreateSchema" value="true"/>
            <property name="datanucleus.validateTables" value="false"/>
            <property name="datanucleus.validateConstraints" value="false"/>
        </properties>
    </persistence-unit>
</persistence>

持久化实体的代码

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


public class App {
    public static void main(String[] args) {
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("just_test");

        // Create entity manager
        EntityManager em = null;
        String id;
        try {
            em = emf.createEntityManager();
            EntityTransaction tx = em.getTransaction();
            TestEntity testEntity = new TestEntity();
            tx.begin();
            em.persist(testEntity);
            em.flush();
            tx.commit();
            id = testEntity.getId();
        } finally {
            if (null != em) {
                em.close();
            }
        }

        try {
            em = emf.createEntityManager();
            TestEntity testEntity = em.find(TestEntity.class, id);
            System.out.println(testEntity);
        } finally {
            if (null != em) {
                em.close();
            }
        }
    }

pom.xml

...
<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.mongodb</groupId>
        <artifactId>mongo-java-driver</artifactId>
        <version>[2.9.3, )</version>
        <!--<scope>provided</scope>-->
    </dependency>
    <dependency>
        <groupId>org.datanucleus</groupId>
        <artifactId>datanucleus-core</artifactId>
        <version>[2.9, )</version>
    </dependency>
    <dependency>
        <groupId>org.datanucleus</groupId>
        <artifactId>datanucleus-mongodb</artifactId>
        <version>[2.9, )</version>
    </dependency>
    <dependency>
        <groupId>org.datanucleus</groupId>
        <artifactId>datanucleus-api-jpa</artifactId>
        <version>[3.0, )</version>
    </dependency>
    <dependency>
        <groupId>org.datanucleus</groupId>
        <artifactId>datanucleus-api-jdo</artifactId>
        <version>[3.0, )</version>
    </dependency>
    <dependency>
        <groupId>org.apache.geronimo.specs</groupId>
        <artifactId>geronimo-jpa_2.0_spec</artifactId>
        <version>[1.0, )</version>
    </dependency>
    <dependency>
        <groupId>javax.jdo</groupId>
        <artifactId>jdo2-api</artifactId>
        <version>2.2</version>
    </dependency>
    <dependency>
        <groupId>javax.transaction</groupId>
        <artifactId>transaction-api</artifactId>
        <version>[1.1-rev-1, )</version>
    </dependency>
    <dependency>
        <groupId>javax.persistence</groupId>
        <artifactId>persistence-api</artifactId>
        <version>1.0b</version>
    </dependency>

</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.datanucleus</groupId>
            <artifactId>maven-datanucleus-plugin</artifactId>
            <version>3.1.0-m3</version>
            <configuration>
                <log4jConfiguration>${basedir}/log4j.properties</log4jConfiguration>
                <verbose>true</verbose>
            </configuration>
            <executions>
                <execution>
                    <phase>process-classes</phase>
                    <goals>
                        <goal>enhance</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>
...

这段代码工作正常。

一旦我尝试部署使用相同代码的应用程序，发生的第一件事就是 GF 无法找到某些类。不过，这些类位于 .ear 文件中。我不得不将几个类放到 GF_HOME/glassfish/domains//lib 目录中以使 GF 能够找到这些类，但最后我以异常告终

Caused by: javax.persistence.PersistenceException: No Persistence provider for EntityManager named just_test

值得一提的是，org.datanucleus.api.jpa.PersistenceProviderImpl 类在我也放在域的 lib 目录中的 datanucleus-api-jpa 文件中。

我也试过像下面这样用 CDI 来做

@PersistenceContext(unitName = "just_test")
protected EntityManager entityManager;

@Override
public void persist(TestEntity testEntity) {
    entityManager.persist(testEntity);
}

这个方法也没有成功。我有一个异常(exception)

java.lang.ClassCastException: Cannot cast org.datanucleus.api.jpa.PersistenceProviderImpl to javax.persistence.spi.PersistenceProvider

任何想法或指向文章和/或文档的链接将不胜感激。谢谢

下面是我用于尝试在 Glassfish 上部署的应用程序的依赖项列表。我必须将所有具有“提供”范围的依赖项放入 Glassfish 的 lib 目录中

<dependency>
    <groupId>org.datanucleus</groupId>
    <artifactId>datanucleus-core</artifactId>
    <version>[2.9, )</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>org.datanucleus</groupId>
    <artifactId>datanucleus-mongodb</artifactId>
    <version>[2.9, )</version>
</dependency>
<dependency>
    <groupId>org.datanucleus</groupId>
    <artifactId>datanucleus-api-jpa</artifactId>
    <version>[3.0, )</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>org.apache.geronimo.specs</groupId>
    <artifactId>geronimo-jpa_2.0_spec</artifactId>
    <version>[1.0, )</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>org.datanucleus</groupId>
    <artifactId>datanucleus-api-jdo</artifactId>
    <version>[3.0, )</version>
</dependency>
<dependency>
    <groupId>javax.jdo</groupId>
    <artifactId>jdo2-api</artifactId>
    <version>2.2</version>
</dependency>

Answer 1

我设法解决了它。我必须修改依赖项，如下所示

<properties>
    <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <datanucleus.version>3.1.3</datanucleus.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.datanucleus</groupId>
        <artifactId>datanucleus-core</artifactId>
        <version>${datanucleus.version}</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.datanucleus</groupId>
        <artifactId>datanucleus-mongodb</artifactId>
        <version>${datanucleus.version}</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.datanucleus</groupId>
        <artifactId>datanucleus-api-jpa</artifactId>
        <version>${datanucleus.version}</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.datanucleus</groupId>
        <artifactId>datanucleus-api-jdo</artifactId>
        <version>${datanucleus.version}</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.jdo</groupId>
        <artifactId>jdo2-api</artifactId>
        <version>2.2</version>
        <scope>provided</scope>
    </dependency>
</dependencies>

我还必须将所有具有“提供”范围的 jar 放入 GF_HOME/glassfish/domains//lib 目录。我不知道为什么我必须这样做。很高兴得到这个答案。希望这可以为想要将 Datanucleus 与 Glassfish 一起使用的人节省时间