获取"java.lang.UnsupportedOperationException:"

Question

我创建了一个小型JPA项目来保存学生记录.我使用Oracle数据库.我使用OpenJPA作为JPa提供程序.

我已正确创建了Table学生和相关序列.

学生实体课程

@Entity
@Table(name = "Student")
public class Student implements Serializable {

    private int id;
    private String name;
    private static final long serialVersionUID = 1L;

    public Student() {
        super();
    }

    @Id
    @Column(name = "ID")
    @SequenceGenerator(name = "TRAIN_SEQ", sequenceName = "STUDENT_SEQ")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "TRAIN_SEQ")
    public int getId() {
        return this.id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @Column(name = "NAME")
    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

persistence.xml中

<?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="JPAOracleDemo">

        <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>

        <class>com.jpa.demo.model.Student</class>

        <properties>
             <property name="openjpa.ConnectionURL" value="jdbc:oracle:thin:@TEST:50111:TESTPEGAD1" />
            <property name="openjpa.ConnectionDriverName" value="oracle.jdbc.driver.OracleDriver" />
            <property name="openjpa.ConnectionUserName" value="admin" />
            <property name="openjpa.ConnectionPassword" value="admin" />
            <property name="openjpa.RuntimeUnenhancedClasses" value="supported" />
            <property name="openjpa.jdbc.Schema" value="MYSCHEMA" />
        </properties>

    </persistence-unit>

</persistence>

客户类

OpenJPAEntityManager em = JPAUtil.getEntityManager();
        OpenJPAEntityTransaction tx = em.getTransaction();
        tx.begin();

        // Create the instance of Employee Entity class
        Student student = new Student();
        student.setName("A.Ramesh");

        // JPA API to store the Student instance on the database.
        em.persist(student);
        tx.commit();
        em.close();

        System.out.println("Done...");

Util类

private static OpenJPAEntityManagerFactory emf = OpenJPAPersistence
            .createEntityManagerFactory("JPAOracleDemo", "META-INF/persistence.xml");

    private static OpenJPAEntityManager entManager;

    /**
     * No need to create any instance for this Util.
     */
    private JPAUtil() {
    }

    /**
     * Get {@link EntityManager}.
     * 
     * @return the {@link EntityManager}
     */
    public static OpenJPAEntityManager getEntityManager() {

        if (entManager == null || !entManager.isOpen()) {
            entManager = emf.createEntityManager();
        }

        return entManager;
    }

数据在学生表中成功保留,但我有以下错误

Exception in thread "Attachment 60230" java.lang.UnsupportedOperationException: cannot get the capability, performing dispose of the retransforming environment
    at com.ibm.tools.attach.javaSE.Attachment.loadAgentLibraryImpl(Native Method)
    at com.ibm.tools.attach.javaSE.Attachment.loadAgentLibrary(Attachment.java:253)
    at com.ibm.tools.attach.javaSE.Attachment.parseLoadAgent(Attachment.java:235)
    at com.ibm.tools.attach.javaSE.Attachment.doCommand(Attachment.java:154)
    at com.ibm.tools.attach.javaSE.Attachment.run(Attachment.java:116)
Exception in thread "main" java.lang.UnsupportedOperationException: cannot get the capability, performing dispose of the retransforming environment
    at sun.instrument.InstrumentationImpl.isRetransformClassesSupported0(Native Method)
    at sun.instrument.InstrumentationImpl.isRetransformClassesSupported(InstrumentationImpl.java:124)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:48)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
    at java.lang.reflect.Method.invoke(Method.java:600)
    at org.apache.openjpa.enhance.ClassRedefiner.canRedefineClasses(ClassRedefiner.java:123)
    at org.apache.openjpa.enhance.ManagedClassSubclasser.prepareUnenhancedClasses(ManagedClassSubclasser.java:122)
    at org.apache.openjpa.kernel.AbstractBrokerFactory.loadPersistentTypes(AbstractBrokerFactory.java:304)
    at org.apache.openjpa.kernel.AbstractBrokerFactory.initializeBroker(AbstractBrokerFactory.java:228)
    at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:202)
    at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:156)
    at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:213)
    at com.ibm.ws.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:45)
    at com.ibm.ws.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:30)
    at com.jpa.demo.util.JPAUtil.getEntityManager(JPAUtil.java:32)
    at com.jpa.demo.client.JPAClient.main(JPAClient.java:13)
1045  JPAOracleDemo  INFO   [main] openjpa.Enhance - Creating subclass for "[class com.jpa.demo.model.Student]". This means that your application will be less efficient and will consume more memory than it would if you ran the OpenJPA enhancer. Additionally, lazy loading will not be available for one-to-one and many-to-one persistent attributes in types using field access; they will be loaded eagerly instead.
Done...

Java版本

JDK 1.6

有人请告诉我这里的问题是什么？

更新:

我使用IBM Rational Software Architect for Websphere Software进行此开发.这个问题与这个IDE有关.当我默认创建JPA项目时,它会添加IBM jre.我刚刚删除了IBM jre并尝试了SUN jre,然后它就成功了.请让我知道为什么这个功能不支持IBM jre？

Answer 1

<property name="openjpa.RuntimeUnenhancedClasses" value="supported" />

首先，摆脱该财产。