錯誤消息：沒有找到EntityManager的持久性提供者命名爲

Question

我遇到運行我的JPA註解java程序的問題。它看起來我沒有正確設置環境。這是我的錯誤信息：

這裏是我的項目結構：

這裏是我的persistence.xml

<persistence 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" 
     version="2.0"> 
    <persistence-unit name="IFP" transaction-type="RESOURCE_LOCAL"> 
     <provider>org.hibernate.ejb.HibernatePersistence</provider> 

     <class>gov.faa.infra.ifp.ifp_hibernate_test.ProcSegment</class> 


     <exclude-unlisted-classes>false</exclude-unlisted-classes> 
     <validation-mode>NONE</validation-mode> 
     <properties> 
      <property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect"/> 
      <property name="hibernate.archive.autodetection" value="class, htm" /> 
      <property name="hibernate.cache.use_second_level_cache" value="false" /> 
      <property name="hibernate.cache.use_query_cache" value="false" /> 
      <property name="hibernate.hbm2ddl.auto" value="update" /> 
      <property name="hibernate.show_sql" value="false" /> 
      <property name="hibernate.format_sql" value="true" /> 
      <property name="hibernate.transaction.flush_before_completion" value="true" /> 

      <property name="javax.persistence.jdbc.driver" value="oracle.jdbc.driver.OracleDriver"/> 
      <property name="javax.persistence.jdbc.url" value="jdbc:oracle:thin:@jamcdfdndb500.amc.faa.gov:1521:dnavln"/> 
      <property name="url" value="jdbc:oracle:thin:@jamcdfdndb500.amc.faa.gov:1521:dnavln" /> 
      <property name="javax.persistence.jdbc.user" value="xxxxxx"/> 
      <property name="javax.persistence.jdbc.password" value="xxxxxx"/> 

      <property name="javax.persistence.query.timeout" value="1000000"/> 
     </properties> 
</persistence-unit> 

</persistence> 

這裏是我的代碼來創建實體經理：

package gov.faa.infra.ifp.ifp_hibernate_test; 

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

public class AccessHibernateTest { 

    public static void main(String[] args) { 
     // TODO Auto-generated method stub 
     EntityManagerFactory entityManagerfactory = Persistence.createEntityManagerFactory("IFP"); 
     EntityManager entityManager= entityManagerfactory.createEntityManager(); 

     entityManager.getTransaction().begin(); 

     ProcId procId=new ProcId(6688L, 1, "C", new Integer(0)); 

     ProcSegment procSegment=entityManager.find(ProcSegment.class, procId); 

     System.out.println(procSegment.toString()); 

     entityManager.getTransaction().commit(); 

    } 

} 

這裏是我的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/xsd/maven-4.0.0.xsd"> 
    <modelVersion>4.0.0</modelVersion> 

    <groupId>gov.faa.infra.ifp</groupId> 
    <artifactId>ifp-hibernate-test</artifactId> 
    <version>0.0.1</version> 
    <packaging>jar</packaging> 

    <name>ifp-hibernate-test</name> 
    <url>http://maven.apache.org</url> 

    <properties> 
    <hibernate.core.version>3.6.10.Final</hibernate.core.version> 
    <junit.version>4.6</junit.version> 
    </properties> 

    <dependencies> 
    <dependency> 
     <groupId>org.hibernate</groupId> 
     <artifactId>hibernate-core</artifactId> 
     <version>${hibernate.core.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>junit</groupId> 
     <artifactId>junit</artifactId> 
     <version>${junit.version}</version> 
     <scope>test</scope> 
    </dependency> 
    </dependencies> 


    <build> 
     <finalName>siap</finalName> 
     <resources> 
      <resource> 
       <directory>src/main/resources</directory> 
       <filtering>true</filtering> 
       <includes> 
        <include>build.txt</include> 
        <include>log4j.properties</include> 
        <include>siap.properties</include> 
        <include>correlation.properties</include> 
        <include>META-INF/persistence.xml</include> 
       </includes> 
      </resource> 
     </resources> 
     <plugins> 
      <plugin> 
       <groupId>org.apache.maven.plugins</groupId> 
       <artifactId>maven-compiler-plugin</artifactId> 
       <version>2.3.2</version> 
       <configuration> 
        <compilerArguments> 
         <extdirs>${basedir}/src/main/webapp/WEB-INF/lib</extdirs> 
        </compilerArguments> 
        <source>1.7</source> 
        <target>1.7</target> 
       </configuration> 
      </plugin> 
      <plugin> 
       <groupId>org.apache.maven.plugins</groupId> 
       <artifactId>maven-surefire-plugin</artifactId> 
       <version>2.14.1</version> 
       <configuration> 
        <additionalClasspathElements> 
         <additionalClasspathElement>${basedir}/src/main/webapp/WEB-INF/lib/restlet-2.0m3.jar</additionalClasspathElement>      
        </additionalClasspathElements> 
       </configuration> 
      </plugin> 

     </plugins> 
    </build> 
</project> 

我試圖建立環境，過去的職位建議，但它沒有工作，我使用Eclipse。我感到困惑的一件事是在建議中設置課程路徑。任何人都可以給我一個提示嗎？我會很感激。

山姆

Answer 1

已指定提供商

<provider>org.hibernate.ejb.HibernatePersistence</provider> 

但是你不必在類路徑HibernatePersistence一流的罐子。此課程位於相應版本的hibernate-entitymanager罐子中。

你只需要添加hibernate-entitymanager您pom.xml

<dependency> 
    <groupId>org.hibernate</groupId> 
    <artifactId>hibernate-entitymanager</artifactId> 
    <version>${hibernate.core.version}</version> 
</dependency>