環境：Tomcat-Webサーバー、eclipselink-2.4.1（Juno）JPA、Odata4j EclipseリンクでJPA（テーブルから動的エンティティを生成）を行っています。私のpersistence.xmlは次のようになります
<persistence-unit name="abcLink"
transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<mapping-file>META-INF/eclipselink-orm.xml</mapping-file>
<properties>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost/netspectiveauthentication?zeroDateTimeBehavior=convertToNull"/>
<property name="javax.persistence.jdbc.user" value="root" />
<property name="javax.persistence.jdbc.password" value="" />
<property name="eclipselink.ddl-generation" value="create-tables" />
<property name="eclipselink.logging.level" value="INFO" />
<property name="eclipselink.logging.exceptions" value="true" />
</properties>
</persistence-unit>
およびプロバイダークラスで
String persistenceUnitName = "abcLink";
EntityManagerFactory emf = Persistence.createEntityManagerFactory(persistenceUnitName,properties);
emf.createEntityManager();
return new JPAProducer(emf, "abcd", 20);
これを ODATA4j の実装に使用しているため、実行中に ODataProducer create 関数をオーバーライドすることでプロパティが取得されます。次のエラーが発生します。
javax.persistence.PersistenceException: Exception [EclipseLink-28017] (Eclipse Persistence Services - 2.4.1.v20121003-ad44345): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Unable to predeploy PersistenceUnit [AuthenticationServiceEclipseMysqlLink] in invalid state [DeployFailed].
Internal Exception: javax.persistence.PersistenceException: Exception [EclipseLink-28019] (Eclipse Persistence Services - 2.4.1.v20121003-ad44345): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Deployment of PersistenceUnit [AuthenticationServiceEclipseMysqlLink] failed. Close all factories for this PersistenceUnit.
Internal Exception: Exception [EclipseLink-7328] (Eclipse Persistence Services - 2.4.1.v20121003-ad44345): org.eclipse.persistence.exceptions.ValidationException
Exception Description: When using VIRTUAL access a DynamicClassLoader must be provided when creating the entity manager factory using the eclipselink property [eclipselink.classloader]. That is, createEntityManagerFactory(String persistenceUnitName, Map properties) and add a new DynamicClassLoader() to the Map properties.
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:1226)
at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:134)
at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source)
エラーは明らかだと思いますが、知りたいのですが、プロパティを介して動的クラスローダーを与えるにはどうすればよいですか。または、このエラーを取り除く他の方法。