当前位置: 首页 > 工具软件 > OpenJPA > 使用案例 >

openjpa mysql_java – 使用openJPA MySQL进行运行时优化的例外

高峻
2023-12-01

关于这个问题肯定有很多问题,我已经读了一些,但答案仍然没有找到答案.我是JPA的新手,我只是想测试一个简单的应用程序,看看我是否可以正确配置它.它是一个独立的应用程序,意味着它不会与Web服务器或任何东西一起运行.实体类看起来像:

@Entity

public class Person{

@Id

private String userID = null;

@Transient

private UserState userState = null;

private String email = null;

private String name = null;

public Person(){

userID = null;

email = null;

name = null;

userState = null;

}

public String getUserID() {

return userID;

}

public void setUserID(String userID) {

this.userID = userID;

}

public String getEmail() {

return email;

}

public void setEmail(String email) {

this.email = email;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public UserState getUserState() {

return userState;

}

public void setUserState(UserState userState) {

this.userState = userState;

}

}

主要的:

public class PersistenceTest {

public static void main(String[] args) {

System.out.println("creating person");

Person p = new Person();

p.setUserID("GregR");

p.setEmail("Gregory@company.de");

p.setUserState(UserState.ACTIVE);

System.out.println("done creating person GregR");

EntityManagerFactory factory = Persistence.createEntityManagerFactory(PersonService.PERSISTENCE_UNIT_NAME);

System.out.println("factory initialized");

EntityManager manager = factory.createEntityManager();

System.out.println("EntityManager initialized");

PersonService service = new PersonService(manager);

System.out.println("service initialized");

System.out.println("Beginning transaction");

manager.getTransaction().begin();

System.out.println("Transaction begun");

System.out.println("attempting to persist person");

service.persistEntity(p);

manager.getTransaction().commit();

System.out.println("person persisted");

System.out.println("beginning cleanup");

manager.close();

factory.close();

System.out.println("Cleanup has completed");

}

}

配置:

org.apache.openjpa.persistence.PersistenceProviderImpl

de.hol.persistable.entities.Person

控制台打印输出:

creating person

done creating person GReeder

factory initialized

47 PersonService INFO [main] openjpa.Runtime - Starting OpenJPA 2.3.0

110 PersonService INFO [main] openjpa.jdbc.JDBC - Using dictionary class "org.apache.openjpa.jdbc.sql.MySQLDictionary".

306 PersonService INFO [main] openjpa.jdbc.JDBC - Connected to MySQL version 5.5 using JDBC driver MySQL-AB JDBC Driver version mysql-connector-java-5.0.8 ( Revision: ${svn.Revision} ).

Exception in thread "main" <1540826 nonfatal user error> org.apache.openjpa.persistence.ArgumentException: This configuration disallows runtime optimization, but the following listed types were not enhanced at build time or at class load time with a javaagent: "1540826>

de.hol.persistable.entities.Person".

at org.apache.openjpa.enhance.ManagedClassSubclasser.prepareUnenhancedClasses(ManagedClassSubclasser.java:115)

at org.apache.openjpa.kernel.AbstractBrokerFactory.loadPersistentTypes(AbstractBrokerFactory.java:312)

at org.apache.openjpa.kernel.AbstractBrokerFactory.initializeBroker(AbstractBrokerFactory.java:236)

at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:212)

at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:155)

at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:226)

at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:153)

at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:59)

at de.hol.persistable.PersistenceTest.main(PersistenceTest.java:24)

我的问题

我猜主要的问题是,我做错了什么.我对此非常陌生,我正试图让这个独立的应用程序工作,以便我可以扩展它以供现实世界使用.

2.我是否缺少persistence.xml文件以外的其他一些配置?

3.为独立应用程序解决此错误的最简单方法是什么?

提前谢谢了!

解决方法:

我看到你有主类,因此我假设你在Java SE环境中使用它.使其工作的最简单方法是在命令行中定义-javaagent,如下所示:

java -jar myJAR.jar -javaagent:openjpa-all-2.3.0.jar

也可以从Eclipse:Run-> Run Configurations->在“Java Applications”中找到您的应用程序 – > Arguments-> VM arguments-> add

-javaagent:/full/path/to/openjpa-all-2.3.0.jar

标签:openjpa,java,mysql,jpa

来源: https://codeday.me/bug/20190728/1561773.html

 类似资料: