求教，测试出现两个warning?
五月 04, 2018 11:17:15 上午 org.hibernate.cfg.Configuration configure
INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml
五月 04, 2018 11:17:15 上午 org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: HHH000040: Configuration resource: /hibernate.cfg.xml
五月 04, 2018 11:17:15 上午 org.hibernate.internal.util.xml.DTDEntityResolver resolveEntity
WARN: HHH000223: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/. Use namespace http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide!
五月 04, 2018 11:17:15 上午 org.hibernate.cfg.Configuration addResource
INFO: HHH000221: Reading mappings from resource: Students.hbm.xml
五月 04, 2018 11:17:15 上午 org.hibernate.internal.util.xml.DTDEntityResolver resolveEntity
WARN: HHH000223: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/. Use namespace http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide!
五月 04, 2018 11:17:16 上午 org.hibernate.cfg.Configuration doConfigure
INFO: HHH000041: Configured SessionFactory: null
五月 04, 2018 11:17:16 上午 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000402: Using Hibernate built-in connection pool (not for production use!)
五月 04, 2018 11:17:16 上午 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000115: Hibernate connection pool size: 20
五月 04, 2018 11:17:16 上午 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000006: Autocommit mode: false
五月 04, 2018 11:17:16 上午 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql:///hibernate?useUnicode=true?useUnicode=true&characterEncoding=UTF-8]
五月 04, 2018 11:17:16 上午 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000046: Connection properties: {user=root, password=****}
五月 04, 2018 11:17:16 上午 org.hibernate.engine.jdbc.internal.JdbcServicesImpl configure
WARN: HHH000342: Could not obtain connection to query metadata : The connection property 'useUnicode' only accepts values of the form: 'true', 'false', 'yes' or 'no'. The value 'true?useUnicode=true' is not in this set.
