Question

我有一本普通的Java类书，标注为jpa的Entity。我配置了持久性xml，但是我有很大的堆栈跟踪，但有我不理解的异常。另外，我在javax.persistence中找不到jdbc包。我怎么办？

这是我的实体

package Java.JPA;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class Book
{
  @Id @GeneratedValue
  private long id;
  private String title;

  public Book()
  {

  }

  public Book(String title) {
    this.title = title;
  }

  public String getTitle()
  {
    return title;
  }

  public void setTitle(String title) {
    this.title = title;
  }
}

这是我的主要课程

package Java;

import Java.JPA.Book;
import java.sql.SQLException;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;

public class main
{

  public static void main(String[] args) throws SQLException, ClassNotFoundException {
    EntityManagerFactory emf = Persistence.createEntityManagerFactory("example");
    EntityManager em = emf.createEntityManager();
    Book book = new Book("TestJPA");
    EntityTransaction tx = em.getTransaction();
    tx.begin();
    em.persist(book);
    tx.commit();

    em.close();
    emf.close();
  }
}

这是我的persistence.xml

<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
                                 http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
  version="2.1">

  <persistence-unit name="example">
    <!--<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>-->
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>

    <class>Java.JPA.Book</class>
    <properties>
      <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
      <property name="javax.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver"/>
      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/studyJPA"/>
      <property name="javax.persistence." value="root"/>
      <property name="javax.persistence.jdbc.password" value="root"/>
    </properties>
  </persistence-unit>
</persistence>

堆栈跟踪：

"C:\Program Files\Java\jdk1.8.0_92\bin\java" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2017.3.2\lib\idea_rt.jar=55859:C:\Program Files\JetBrains\IntelliJ IDEA 2017.3.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_92\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\rt.jar;C:\Tomcat\apache-tomcat-9.0.7\lib\servlet-api.jar;C:\Users\Anton\Desktop\study\target\classes;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\javaee-api-7.0-1.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\jsp-api.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\tomcat-api.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\servlet-api.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\el-api.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\jasper.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\catalina.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\ecj-4.6.3.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\jasper-el.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\jaspic-api.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\tomcat-jni.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\catalina-ha.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\serp-1.15.1.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\tomcat-dbcp.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\tomcat-jdbc.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\tomcat-util.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\xalan-2.7.2.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\catalina-ant.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\hawtbuf-1.11.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\howl-1.0.1-1.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\hsqldb-2.3.2.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\jasypt-1.9.2.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\mimepull-1.9.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\neethi-3.0.3.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\wsdl4j-1.6.3.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\xmlsec-2.0.6.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\joda-time-2.7.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\openjpa-2.4.3.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\stax-ex-1.7.4.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\tomcat-coyote.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\websocket-api.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\activation-1.1.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\bval-jsr-1.1.2.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\jaxb-api-2.3.0.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\stax-api-1.0-2.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\tomcat-i18n-es.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\tomcat-i18n-fr.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\tomcat-i18n-ja.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\bval-core-1.1.2.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\catalina-tribes.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\commons-cli-1.2.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\cryptacular-1.0.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\cxf-core-3.1.15.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\jaxb-core-2.3.0.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\jaxb-impl-2.3.0.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\stax2-api-3.1.4.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\sxc-runtime-0.8.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\commons-lang-2.6.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\saaj-impl-1.3.23.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\serializer-2.7.2.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\slf4j-api-1.7.21.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\tomcat-util-scan.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\tomcat-websocket.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\tomee-jdbc-7.1.0.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\xbean-naming-4.9.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\xml-resolver-1.2.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\commons-dbcp2-2.1.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\commons-lang3-3.5.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\commons-pool2-2.3.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\openejb-api-7.1.0.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\openejb-cxf-7.1.0.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\openejb-javaagent.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\openejb-jee-7.1.0.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\sxc-jaxb-core-0.8.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\tomee-jaxrs-7.1.0.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\xbean-reflect-4.9.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\activemq-ra-5.14.5.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\commons-codec-1.10.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\cxf-rt-wsdl-3.1.15.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\java-support-7.1.1.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\johnzon-core-1.0.1.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\myfaces-api-2.2.12.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\openejb-core-7.1.0.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\openejb-ejbd-7.1.0.jar;D:\Program\TomEE+\apache-tomee-plus-7.1.0\lib\openejb-hsql-7.1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Java.main
91  INFO   [main] openjpa.Runtime - OpenJPA dynamically loaded the class enhancer. Any classes that were not enhanced at build time will be enhanced when they are loaded by the JVM.
121  INFO   [main] openjpa.Runtime - Starting OpenJPA 2.4.3
Exception in thread "main" <openjpa-2.4.3-r422266:1833086 fatal user error> org.apache.openjpa.persistence.ArgumentException: The persistence provider is attempting to use properties in the persistence.xml file to resolve the data source. A Java Database Connectivity (JDBC) driver or data source class name must be specified in the openjpa.ConnectionDriverName or javax.persistence.jdbc.driver property. The following properties are available in the configuration: "org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl@2655aabb". 
    at org.apache.openjpa.jdbc.schema.DataSourceFactory.newDataSource(DataSourceFactory.java:71)
    at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.createConnectionFactory(JDBCConfigurationImpl.java:850)
    at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.getDBDictionaryInstance(JDBCConfigurationImpl.java:603)
    at org.apache.openjpa.jdbc.meta.MappingRepository.endConfiguration(MappingRepository.java:1520)
    at org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:535)
    at org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:460)
    at org.apache.openjpa.lib.conf.PluginValue.instantiate(PluginValue.java:121)
    at org.apache.openjpa.conf.MetaDataRepositoryValue.instantiate(MetaDataRepositoryValue.java:68)
    at org.apache.openjpa.lib.conf.ObjectValue.instantiate(ObjectValue.java:83)
    at org.apache.openjpa.conf.OpenJPAConfigurationImpl.newMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:973)
    at org.apache.openjpa.conf.OpenJPAConfigurationImpl.getMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:964)
    at org.apache.openjpa.kernel.AbstractBrokerFactory.makeReadOnly(AbstractBrokerFactory.java:642)
    at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:202)
    at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:154)
    at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:226)
    at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:153)
    at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:59)
    at Java.main.main(main.java:15)

Process finished with exit code 1

在依赖项pom.xml中有休眠和mysql驱动程序。另外，我从tomcat的目录中导入javaee-api-7.0-1.jar，servlet-api.jar和jsp-api.jar。请帮忙。我尝试解决了几个多小时。我将不胜感激！

这是我的java ee jar文件。没有jdbc软件包或其他名称为“ jdbc”的文件

enter image description here

也许，我下载了错误的tomcat ee。如果是这样，请给我一个下载正确版本的链接。

我不知道发生了什么，但是我有新的例外情况

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/geronimo/osgi/locator/ProviderLocator
    at javax.persistence.spi.PersistenceProviderResolverHolder$DefaultPersistenceProviderResolver.getPersistenceProviders(PersistenceProviderResolverHolder.java:108)
    at javax.persistence.Persistence.getProviders(Persistence.java:275)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:88)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:72)
    at Java.main.main(main.java:14)
Caused by: java.lang.ClassNotFoundException: org.apache.geronimo.osgi.locator.ProviderLocator
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 5 more

这很神奇：）现在我有一个问题。该如何解决？

Answer 1

<persistence>
    <persistence-unit name="manager1" transaction-type="RESOURCE_LOCAL">
        <class>org.hibernate.ejb.test.Apple</class>
        <class>org.hibernate.ejb.test.Distributor</class>
        <class>org.hibernate.ejb.test.Fruit</class>
        <properties>
            <property name="javax.persistence.jdbc.driver" value="org.hsqldb.jdbcDriver"/>
            <property name="javax.persistence.jdbc.user" value=""/>
            <property name="javax.persistence.jdbc.password" value=""/>
            <property name="javax.persistence.jdbc.url" value="jdbc:hsqldb:."/>
            <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/
            <property name="hibernate.max_fetch_depth" value="3"/>
            <property name="hibernate.ejb.classcache.org.hibernate.ejb.test.Item"
                      value="read-write"/>
            <property       name="hibernate.ejb.collectioncache.org.hibernate.ejb.test.Item.distributors"
                            value="read-write, RegionName"/>
        </properties>
    </persistence-unit>
</persistence>

无法从persistence.xml连接到JDBC

1 个答案: