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我嘗試設置一個RESTful JavaEE-應用程序，它使用JPA保存它的數據。首先，我使用Maven創建了一個新項目並將其導入到Netbeans 8.0.2。我創建了一個示例Derby數據庫（沒有表），並將我的應用程序部署到Glassfish4.1。從NetBeans IDE中對數據庫的連接工作正常（JDBC：德比：//本地主機：1527/simulation_db [上APP]）JPA與德比，沒有持久性提供者的EntityManager名爲
我的實體類：
package hftl.simulation.entity;
//imports...
@Entity
public class Agent implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
@Column(name = "name")
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public int hashCode() {
int hash = 0;
hash += (int) id;
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Agent)) {
return false;
}
Agent other = (Agent) object;
if (this.id != other.id) {
return false;
}
return true;
}
@Override
public String toString() {
return "hftl.simulation.entity.Agent[ id=" + id + " ]";
}
}
的服務類澤西島（只是出於測試目的，我知道這不是recommandable對這一帶有GET請求...）：
package hftl.simulation.service;
//imports...
@Path("agent")
public class AgentService {
@PersistenceUnit
private EntityManagerFactory emf = Persistence.createEntityManagerFactory("SimulationPU");
EntityManager em = emf.createEntityManager();
@GET
@Produces(MediaType.TEXT_PLAIN)
public String getAllAgentsGET() {
Agent a1 = new Agent();
a1.setId(1);
a1.setName("pi1");
em.persist(a1);
em.close();
return "GET";
}
}
的persistence.xml：
<?xml version="1.0" encoding="UTF-8"?>
<persistence>
<persistence-unit name="SimulationPU" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>jdbc/simulation_DS</jta-data-source>
<class>hftl.simulation.entity.Agent</class>
<properties>
<property name="toplink.platform.class.name" value="oracle.toplink.essentials.platform.database.DB2Platform"/>
</properties>
的pom.xml：
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>hftl.simulation</groupId>
<artifactId>simulation_api</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>simulation_api</name>
<build>
<finalName>simulation_api</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<inherited>true</inherited>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.glassfish.jersey</groupId>
<artifactId>jersey-bom</artifactId>
<version>${jersey.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet-core</artifactId>
<!-- use the following artifactId if you don't need servlet 2.x compatibility -->
<!-- artifactId>jersey-container-servlet</artifactId -->
</dependency>
<!-- uncomment this to get JSON support
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-moxy</artifactId>
</dependency>
-->
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.5.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId>
<version>2.5.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derby</artifactId>
<version>10.10.1.1</version>
</dependency>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>7.0</version>
<type>jar</type>
</dependency>
</dependencies>
<properties>
<jersey.version>2.22.1</jersey.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
我手動添加的依賴性爲德比。我怎麼知道我應該使用哪個版本的Derby？部署到Glassfish的工作，但我無法弄清楚什麼是持久性提供者的問題。當我嘗試通過http://localhost:8080/simulation_api/agent調用REST的資源Glassfish的ServerLog中說：
Information: simulation_api was successfully deployed in 1.832 milliseconds.
Warnung: The following warnings have been detected: WARNING: Unknown HK2 failure detected:
MultiException stack 1 of 1
javax.persistence.PersistenceException: No Persistence provider for EntityManager named SimulationPU
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:85)
...
感謝您的幫助。