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我正在使用 glassfish、postgres 和 openjpa。

我只有一个 bean，首先想创建一个新实例并将其存储在 DB 中。我创建了一个新的用户对象，填充它（除了 id）并得到 - 试图坚持 - 以下异常：

Caused by: java.lang.IllegalStateException: WEB9031: WebappClassLoader unable to load resource [org.apache.openjpa.util.LongId], because it has not yet been started, or was already stopped
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1401)
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1359)
at org.myPlace.server.user.UserPDO.pcNewObjectIdInstance(UserPDO.java)
at org.apache.openjpa.enhance.PCRegistry.newObjectId(PCRegistry.java:142)
at org.apache.openjpa.meta.MetaDataRepository.processRegisteredClass(MetaDataRepository.java:1694)
at org.apache.openjpa.meta.MetaDataRepository.processRegisteredClasses(MetaDataRepository.java:1644)
... 128 more

 WARNING: StandardWrapperValve[Faces Servlet]: PWC1406: Servlet.service() for
 servlet Faces Servlet threw exception
 java.lang.IllegalStateException: WEB9031: WebappClassLoader unable to load resource   
 [org.apache.openjpa.util.LongId], because it has not yet been started, or was already stopped
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1401)
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1359)
at org.myPlace.server.user.UserPDO.pcNewObjectIdInstance(UserPDO.java)
at org.apache.openjpa.enhance.PCRegistry.newObjectId(PCRegistry.java:142)
at org.apache.openjpa.meta.MetaDataRepository.processRegisteredClass(MetaDataRepository.java:1694)

我的豆子看起来像这样：

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

private long id;
private String username;
private String password;

public UserPDO() {}

@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="user_seq_gen") 
@SequenceGenerator(name="user_seq_gen", sequenceName="user_seq")
public long getId() {
    return id;
}

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

... }

我的 persistence.xml 看起来像这样：

<?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="myPlace" transaction-type="JTA">

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

    <class>org.myPlace.server.user.UserPDO</class>

    <properties>
      <property name="openjpa.jdbc.DBDictionary" value="postgres"/>

      <property name="openjpa.ConnectionDriverName" value="org.postgresql.Driver"/>
      <property name="openjpa.ConnectionURL" value="jdbc:postgresql://localhost:5432/myPlace"/>
      <property name="openjpa.ConnectionPassword" value="myPlace"/>
      <property name="openjpa.ConnectionUserName" value="myPlace"/>

      <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema"/> 
      <property name="openjpa.Log" value="File=/home/username/apache.log, DefaultLevel=ERROR, Tool=INFO, SQL=TRACE"/>

      <property name="openjpa.DynamicEnhancementAgent" value="false" />
      <property name="openjpa.RuntimeUnenhancedClasses" value="unsupported" />
      <property name="openjpa.DataCache" value="false"/>
      <property name="openjpa.QueryCache" value="false"/>
    </properties>

</persistence-unit>

该表已正确创建，顺序也是如此。但是当我想通过创建一个新的用户对象时

public <T> T create(T t) {
    this.em.persist(t);
    this.em.flush();
    this.em.refresh(t);
    return t;
}

我得到了上面提到的异常。我在这里找到了一些问题/答案，表明停用运行时增强应该可以解决问题。但这对我不起作用。我的第一个想法是，它可能是 Classloader-Leak。我将 postgres-driver 和 openjpa-jars 复制到 glassfish/lib 文件夹中。

有人可以帮忙吗？谢谢！

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