我有一个名为“Drinks Archive”的旧网络项目。除其他外,您还可以添加、删除、列出和编辑饮品。它在 NetBeans 本地运行良好,但是当我将项目作为 .war 文件部署到使用 Tomcat 6 的服务器时,每次尝试执行数据库操作时都会出现以下错误(例如,将饮料添加到 db):
javax.persistence.PersistenceException: 异常 [EclipseLink-4002] (Eclipse Persistence Services - 2.3.0.v20110604-r9504): org.eclipse.persistence.exceptions.DatabaseException 内部异常: java.sql.SQLNonTransientConnectionException: java.net.ConnectException:在端口 1527 上连接到服务器 localhost 时出错,并显示连接被拒绝消息。错误代码:40000 org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:501) org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:188) org.eclipse.persistence。 internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:277) org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl。
这是我的源代码(在 NetBeans 中,我使用 GlassFish 作为服务器)。
注册.java:
public class Register {
private static Register instance;
private EntityManager em;
private EntityManagerFactory emf = null;
public static Register getInstance() {
if (instance == null) {
instance = new Rekisteri();
}
return instance;
}
private Register() {
try {
Class.forName("org.apache.derby.jdbc.ClientDriver");
} catch (ClassNotFoundException ex) {
Logger.getLogger(Rekisteri.class.getName()).log(Level.SEVERE, null, ex);
}
emf = Persistence.createEntityManagerFactory("DrinksArchivePU");
}
public EntityManager getEntityManager() {
return emf.createEntityManager();
}
public void addDrink(Drink new) {
em = getEntityManager();
em.getTransaction().begin();
em.merge(new);
em.getTransaction().commit();
}
etc...//
}
持久性.xml:
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" 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_2_0.xsd">
<persistence-unit name="DrinksArchivePU" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="eclipselink.jdbc.driver" value="org.apache.derby.jdbc.ClientDriver"/>
<property name="eclipselink.jdbc.user" value="d"/>
<property name="eclipselink.jdbc.password" value="d"/>
<property name="eclipselink.jdbc.url" value="jdbc:derby://localhost:1527/drinks;create=true"/>
<property name="eclipselink.ddl-generation" value="drop-and-create-tables"/>
<property name="eclipselink.ddl-generation.output-mode" value="database"/>
<property name="eclipselink.weaving" value="false"/>
<property name="eclipselink.logging.level" value="FINE"/>
</properties>
</persistence-unit>
我读到问题可能是因为 derby 网络服务器未在我的服务器上启动,但如果是这样,如何解决?
编辑:已修复,我在我的 persistence.xml 设置中更改为 HSQLDB JDBC 驱动程序,之后就是在服务器中的项目中添加不同的缺失 jar 文件。
现在是persistence.xml:
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" 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_2_0.xsd">
<persistence-unit name="DrinksAchivePU" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>archive.Ingredient</class>
<class>archive.Review</class>
<class>archive.Drink</class>
<class>archive.DrinkCategory</class>
<class>archive.User</class>
<class>archive.Register</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.hsqldb.jdbcDriver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:hsqldb:mem:testdb;default_schema=true"/>
<property name="javax.persistence.jdbc.user" value="sa"/>
<property name="javax.persistence.jdbc.password" value=""/>
<property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
</properties>
</persistence-unit>