Jak toplink szuka pliku persistence.xml ? Problem polega na tym, że jar, w którym ten plik się znajduje jest ładowany dynamicznie. W efekcie mam coś takiego:
Thread.currentThread().getContextClassLoader().getResource("META-INF/persistence.xml").getPath()
i powyższe wywołania znajduje zasób.
ClassLoader.getSystemClassLoader().getResource("META-INF/persistence.xml").getPath()
A to już nie działa.
Toplink przy próbie inicjalizacji EntityManagera wyrzuca coś takiego:
javax.persistence.PersistenceException: No Persistence provider for EntityManager named mysql: Provider named oracle.toplink.essentials.PersistenceProvider threw unexpected exception at create EntityManagerFactory: oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException Local Exception Stack: Exception [TOPLINK-30005] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12 /06/2007))): oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: java.net.FactoryURLClassLoader@16504faInternal Exception: java.lang.IllegalArgumentException: URI is not hierarchical
at oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException.
exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:1
43)
at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.creat
eEntityManagerFactory(EntityManagerFactoryProvider.java:169)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.
java:110)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.
java:83)
at org.shell.db.DBManager.<init>(DBManager.java:15)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou
rce)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)