初次用hibernate，帮我看看错误

14:43:14,312  INFO Environment:560 - Hibernate 3.3.2.GA
14:43:14,318  INFO Environment:593 - hibernate.properties not found
14:43:14,323  INFO Environment:771 - Bytecode provider name : javassist
14:43:14,328  INFO Environment:652 - using JDK 1.4 java.sql.Timestamp handling
14:43:14,410  INFO Configuration:1474 - configuring from resource: /hibernate.cfg.xml
14:43:14,410  INFO Configuration:1451 - Configuration resource: /hibernate.cfg.xml
14:43:14,478 DEBUG DTDEntityResolver:64 - trying to resolve system-id [http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd]
14:43:22,860 DEBUG Configuration:1435 - connection.driver_class=com.mysql.jdbc.Driver
14:43:22,860 DEBUG Configuration:1435 - connection.url=jdbc:mysql://localhost/hibernate
14:43:22,860 DEBUG Configuration:1435 - connection.username=root
14:43:22,861 DEBUG Configuration:1435 - connection.password=root
14:43:22,861 DEBUG Configuration:1435 - dialect=org.hibernate.dialect.MySQLDialect
14:43:22,861 DEBUG Configuration:1435 - cache.provider_class=org.hibernate.cache.NoCacheProvider
14:43:22,861 DEBUG Configuration:1435 - show_sql=true
14:43:22,861 DEBUG Configuration:1435 - hbm2ddl.auto=update
14:43:22,862 DEBUG Configuration:1634 - null<-org.dom4j.tree.DefaultAttribute@be49e0 [Attribute: name resource value "com/cc/hibernate/model/Student.hbm.xml"]
14:43:22,862  INFO Configuration:600 - Reading mappings from resource : com/cc/hibernate/model/Student.hbm.xml