Java SE上的openJPA [英] openJPA on Java SE

问题描述

我尝试在ibm RAD上开发JPA项目。我可以在Webpshere上成功运行它，
但问题是我的机器已经很老了。所以在Java EE容器中部署不是
合理。我想在JSE上运行它。但是它给出了以下错误：

I try to develop JPA project on ibm RAD. And i can run it on Webpshere successfully, but the problem is my machine is quite old. So deploying in Java EE container isn't reasonable.And i want to run it on JSE.But it gives following error:

94  test  INFO   [main] openjpa.Runtime - Starting OpenJPA 1.2.1-SNAPSHOT
235  test  INFO   [main] openjpa.jdbc.JDBC - Using dictionary class "com.ibm.ws.persistence.jdbc.sql.DB2Dictionary".
1797  test  WARN   [main] openjpa.Enhance - This configuration disallows runtime optimization, but the following listed types were not enhanced at build time or at class load time with a javaagent: "[class Customer]".
Exception in thread "main" <openjpa-1.2.1-SNAPSHOT-r422266:686069 fatal user error> org.apache.openjpa.persistence.ArgumentException: The type "class Customer" has not been enhanced.
    at org.apache.openjpa.meta.ClassMetaData.resolveMeta(ClassMetaData.java:1650)
    at org.apache.openjpa.meta.ClassMetaData.resolve(ClassMetaData.java:1624)
    at org.apache.openjpa.meta.MetaDataRepository.processBuffer(MetaDataRepository.java:717)
    at org.apache.openjpa.meta.MetaDataRepository.resolveMeta(MetaDataRepository.java:616)
    at org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:541)
    at org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:308)
    at org.apache.openjpa.kernel.BrokerImpl.newObjectId(BrokerImpl.java:1114)
    at org.apache.openjpa.kernel.DelegatingBroker.newObjectId(DelegatingBroker.java:268)
    at org.apache.openjpa.persistence.EntityManagerImpl.find(EntityManagerImpl.java:451)
    at deneme.main(deneme.java:21)

我缺少什么？

我的persistent.xml是：

By the my persistent.xml is:

**<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" 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_1_0.xsd">
    <persistence-unit name="test" transaction-type="RESOURCE_LOCAL">
    <provider>
        com.ibm.websphere.persistence.PersistenceProviderImpl
    </provider> 
        <class>Customer</class>
        <properties>
            <property name="openjpa.ConnectionDriverName" value="com.ibm.db2.jcc.DB2Driver"/>
            <property name="openjpa.ConnectionURL" value="jdbc:db2://localhost:50000/PARUD:retrieveMessagesFromServerOnGetMessage=true;"/>
            <property name="openjpa.ConnectionUserName" value="db2admin"/>
            <property name="openjpa.ConnectionPassword" value="xxxxx"/>
            <property name="openjpa.jdbc.Schema" value="POOL"/>
        </properties>
    </persistence-unit>
</persistence>**

推荐答案

只是一个指针：
你需要增强你的类，例如在运行时通过-javaagent：yourlib.jar
甚至在编译时。您可以在此处了解有关此主题的更多信息：

Just a pointer: You need to enhance your classes e.g. at runtime via -javaagent:yourlib.jar or even while compiling. You could learn more on this topic here:

第二种推荐的运行时增强方法是在启动OpenJPA运行的JVM时提供javaagent。

这篇关于Java SE上的openJPA的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！