我用谷歌搜索过疯狂,但我找不到使用java持久性的错误。
我正在使用glassfish 4.1.1。 NetBeans 8.1。 Glassfish与netbeans集成,服务器和JDBC资源都显示在Windows->服务区域。
的persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" 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">
<persistence-unit name="testDB" transaction-type="JTA">
<jta-data-source>jdbc/MyDataBase</jta-data-source>
<class>person.Person</class>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
</persistence-unit>
</persistence>
连接池和资源的GlassFish domain.xml条目
<jdbc-resource pool-name="MyDataBase" object-type="system-all" jndi-name="jdbc/MyDataBase"></jdbc-resource>
<jdbc-connection-pool driver-classname="java.sql.Driver" ping="true" datasource-classname="org.postgresql.Driver" name="MyDataBase" res-type="java.sql.Driver">
<property name="URL" value="jdbc:postgresql://localhost:5432/testDB"></property>
<property name="connectionAttributes" value=";create=true"></property>
<property name="user" value="*****"></property>
<property name="password" value="****"></property>
<property name="portNumber" value="5432"></property>
<property name="databaseName" value="testDB"></property>
<property name="serverName" value="localhost"></property>
</jdbc-connection-pool>
Pool从Glassfish管理GUI中读得很好,所以我很确定它在那里。
我的Java对象: 具有实体管理器的类:
package person;
import javax.inject.Named;
import javax.enterprise.context.RequestScoped;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
/**
*
* @author jameszeigler
*/
@Named(value = "personCreator")
@RequestScoped
public class PersonCreator {
private Person person;
/**
* Creates a new instance of PersonCreator
*/
public PersonCreator() {
}
public void setPersonValues(){
person = new Person();
person.setAge(10);
person.setFirstName("James");
person.setLastName("Zeigler");
}
public String getPersonValues(){
return "Test";
}
public void persistPerson(){
EntityManagerFactory emfactory = Persistence.createEntityManagerFactory( "testDB" );
EntityManager entitymanager = emfactory.createEntityManager( );
entitymanager.getTransaction( ).begin( );
setPersonValues();
entitymanager.persist( person );
entitymanager.getTransaction( ).commit( );
entitymanager.close( );
emfactory.close( );
}
}
实体类:
package person;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
/**
*
* @author jameszeigler
*/
@Entity
public class Person implements Serializable {
// Data Members //
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@Column(name="firstName")
private String firstName;
@Column(name="lastName")
private String lastName;
@Column(name="age")
private int age;
// Methods //
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public void setFirstName(String firstName){
this.firstName = firstName;
}
public String getFirstName(){
return firstName;
}
public void setLastName(String lastName){
this.lastName = lastName;
}
public String getLastName(){
return lastName;
}
public void setAge(int age){
this.age = age;
}
public int getAge(){
return age;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.hashCode() : 0);
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 Person)) {
return false;
}
Person other = (Person) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "person.Person[ id=" + id + " ]";
}
}
我发誓这应该有用但我在测试中得到了例外:
javax.persistence.PersistenceException: Exception [EclipseLink-7060] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258):
org.eclipse.persistence.exceptions.ValidationException Exception Description:
Cannot acquire data source [jdbc/MyDataBase]. Internal Exception: javax.naming.NamingException: Lookup failed for 'jdbc/MyDataBase' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory,
java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NameNotFoundException: MyDataBase not found]
服务器将此作为资源,我这样做错了吗?我以为我可能需要建立连接而不是创建实体管理器?目前没有其他服务器在运行。我觉得我错过了很简单的东西,但我不确定它是什么。
答案 0 :(得分:1)
不得不回到这一个。我似乎已经从Galssfish 4.1转换到Payara解决了这个问题。 Glassfish 4.1显然存在JDBC资源和连接池的问题。我完全错误地配置了我的NetBeans。 NetBeans附带了自己的GlassFish安装,所以不使用我安装和配置的GlassFish服务器,而是使用它自己,并且不知道我在说什么jdbc池。
在收到关闭GlassFish域的错误并且正在使用Ports的错误之后,我能够解决这个问题。我终于意识到我有两个正在运行的服务器实例。我下载并安装的那个,以及一个NetBeans也正在运行。
确保我将NetBeans配置为使用已安装的服务器进行本地测试(更简单)或确保我在本地domain.xml中进行的任何配置(我将其复制到NetBeans安装中),这是一次很好的学习体验。容易)。