Eclipselink problem in javase project

I am getting this error when I run eclipselink project.

[EL Warning]: 2008.12.05 11: 47: 08.056 - java.lang.NoClassDefFoundError: org / jboss / resource / adapter / jdbc / ValidConnectionChecker was thrown on attempt of PersistenceLoadProcessor to load class com.mysql.jdbc.integration.jboss .MysqlValidConnectionChecker. The class is ignored.

Exception in thread "main" java.lang.NoClassDefFoundError: org / jboss / resource / adapter / jdbc / ValidConnectionChecker
        at java.lang.ClassLoader.defineClass1 (Native Method)
        at java.lang.ClassLoader.defineClass (Unknown Source)
        at java.security.SecureClassLoader.defineClass (Unknown Source)
        at java.net.URLClassLoader.defineClass (Unknown Source)
        at java.net.URLClassLoader.access $ 000 (Unknown Source)
        at java.net.URLClassLoader $ 1.run (Unknown Source)
        at java.security.AccessController.doPrivileged (Native Method)
        at java.net.URLClassLoader.findClass (Unknown Source)
        at java.lang.ClassLoader.loadClass (Unknown Source)
        at sun.misc.Launcher $ AppClassLoader.loadClass (Unknown Source)
        at java.lang.ClassLoader.loadClass (Unknown Source)
        at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.loadClass (PersistenceUnitProcessor.java:261)
        at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.initPersistenceUnitClasses (MetadataProcessor.java:247)
        at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.processEntityMappings (MetadataProcessor.java:422)
        at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processORMetadata (PersistenceUnitProcessor.java:299)
        at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy (EntityManagerSetupImpl.java:830)
        at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.callPredeploy (JPAInitializer.java:101)
        at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.initPersistenceUnits (JPAInitializer.java:149)
        at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.initialize (JPAInitializer.java:135)
        at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory (PersistenceProvider.java:104)
        at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory (PersistenceProvider.java:64)
        at javax.persistence.Persistence.createEntityManagerFactory (Persistence.java:83)
        at javax.persistence.Persistence.createEntityManagerFactory (Persistence.java:60)
        at Main.main (Main.java:32)
Caused by: java.lang.ClassNotFoundException: org.jboss.resource.adapter.jdbc.ValidConnectionChecker
        at java.net.URLClassLoader $ 1.run (Unknown Source)
        at java.security.AccessController.doPrivileged (Native Method)
        at java.net.URLClassLoader.findClass (Unknown Source)
        at java.lang.ClassLoader.loadClass (Unknown Source)
        at sun.misc.Launcher $ AppClassLoader.loadClass (Unknown Source)
        at java.lang.ClassLoader.loadClass (Unknown Source)
        at java.lang.ClassLoader.loadClassInternal (Unknown Source)
        ... 24 more

Any ideas? Why does eclipselink need something from jboss? What jboss jar do I need. I would use open jpa, but for some reason after several exits from my application it starts giving a bunch of stackoverflow errors.