Description
Replace org.springframework.jdbc.datasource.DriverManagerDataSource by org.apache.commons.dbcp.BasicDataSource as recommended by spring:
http://docs.spring.io/spring/docs/current/spring-framework-reference/html/jdbc.html#jdbc-connections
Make property "isolationLevelName" configurable in persistence.properties with default ISOLATION_READ_COMMITTED
See full discussion in dev@ ML: http://markmail.org/message/33aheawb5irzl3xc