java.lang.ClassNotFoundException: oracle.jdbc.pool.OracleDataSource

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java.lang.ClassNotFoundException: oracle.jdbc.pool.OracleDataSource
at com.sun.enterprise.resource.SystemJdbcDataSource.internalGetConnection(SystemJdbcDataSource.java:252)
at com.sun.jdo.spi.persistence.support.sqlstore.ejb.TransactionHelperImpl.getConnection(TransactionHelperImpl.java:171)
at com.sun.jdo.spi.persistence.support.sqlstore.ejb.EJBHelper.getConnection(EJBHelper.java:169)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.SQLPersistenceManagerFactory.getDBName(SQLPersistenceManagerFactory.java:781)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.SQLPersistenceManagerFactory.getFromPool(SQLPersistenceManagerFactory.java:709)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.SQLPersistenceManagerFactory.getPersistenceManager(SQLPersistenceManagerFactory.java:598)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerFactoryImpl.getPersistenceManager(PersistenceManagerFactoryImpl.java:770)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerFactoryImpl.getPersistenceManager(PersistenceManagerFactoryImpl.java:660)

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