我想创建一个简单的测试实体，我希望EclipseLink从实体类创建表。我收到了错误，并且不知道如何解决它：
[EL Info]: server: 2015-10-13 18:26:54.901--ServerSession(1989972246)--Detected server platform: org.eclipse.persistence.platform.server.NoServerPlatform.
[EL Info]: server: 2015-10-13 18:26:54.933--ServerSession(1989972246)--Detected server platform: org.eclipse.persistence.platform.server.NoServerPlatform.
[EL Info]: 2015-10-13 18:26:55.23--ServerSession(1989972246)--EclipseLink, version: Eclipse Persistence Services - 2.6.0.v20150309-bf26070
[EL Severe]: ejb: 2015-10-13 18:26:55.232--ServerSession(1989972246)-- Exception [EclipseLink-4003] (Eclipse Persistence Services - 2.6.0.v20150309-bf26070): org.eclipse.persistence.exceptions.DatabaseException
Exception Description: Configuration error. Class [org.apache.derby.jdbc.EmbeddedDriver;create=true;] not found.
Exception in thread "main" javax.persistence.PersistenceException: Exception [EclipseLink-4003] (Eclipse Persistence Services - 2.6.0.v20150309-bf26070): org.eclipse.persistence.exceptions.DatabaseException
Exception Description: Configuration error. Class [org.apache.derby.jdbc.EmbeddedDriver;create=true;] not found.
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:812)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:205)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:305)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:303)
at com.Test.main(Test.java:29)
Caused by: Exception [EclipseLink-4003] (Eclipse Persistence Services - 2.6.0.v20150309-bf26070): org.eclipse.persistence.exceptions.DatabaseException
Exception Description: Configuration error. Class [org.apache.derby.jdbc.EmbeddedDriver;create=true;] not found.
at org.eclipse.persistence.exceptions.DatabaseException.configurationErrorClassNotFound(DatabaseException.java:89)
at org.eclipse.persistence.sessions.DefaultConnector.loadDriverClass(DefaultConnector.java:267)
at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:85)
at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.setOrDetectDatasource(DatabaseSessionImpl.java:204)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:746)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:253)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:728)
... 5 more
代码如下：
Test.java
package com;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Persistence;
import javax.persistence.Table;
import com.to.Project;
@Entity
@Table(name = "test")
public class Test {
@Id
public int id;
@Basic
public String data;
public static void main(String[] args) {
EntityManagerFactory emf = Persistence.createEntityManagerFactory("test");
EntityManager em = emf.createEntityManager();
EntityTransaction tx = em.getTransaction();
Test test = em.find(Test.class, 1);
if (test == null) {
test = new Test();
test.data = "a";
tx.begin();
em.persist(test);
tx.commit();
}
System.out.format("Test{id=%s, data=%s}\n", test.id, test.data);
em.close();
emf.close();
}
}
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>cat</groupId>
<artifactId>projectmanager</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derby</artifactId>
<version>10.12.1.1</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.6</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.6.0</version>
</dependency>
的persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<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/persistencehttp://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"version="2.0">
<persistence-unit name="test">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver;create=true"/>
<property name="javax.persistence.jdbc.url" value="jdbc:derby:MyDB"/>
<property name="javax.persistence.jdbc.user" value="root"/>
<property name="javax.persistence.jdbc.password" value="root"/>
<property name="eclipselink.ddl-generation" value="create-or-extend-tables"/>
<property name="eclipselink.create-ddl-jdbc-file-name" value="createDDL_ddlGeneration.jdbc"/>
<property name="eclipselink.drop-ddl-jdbc-file-name" value="dropDDL_ddlGeneration.jdbc"/>
<property name="eclipselink.ddl-generation.output-mode" value="both"/>
</properties>
欢迎任何形式的帮助：）
答案 0 :(得分：1)
重新阅读https://db.apache.org/derby/papers/DerbyTut/embedded_intro.html;将;create=true添加到JDBC URL，而不是Driver类名。