mysql-怎么回事，Hibernate这样也能成功，但这么多警告，怎么回事？

2015-7-14 20:58:10 org.hibernate.annotations.common.reflection.java.javareflectionmanager
info: hcann000001: hibernate commons annotations {4.0.5.final}
2015-7-14 20:58:10 org.hibernate.version logversion
info: hhh000412: hibernate core {4.3.10.final}
2015-7-14 20:58:10 org.hibernate.cfg.environment
info: hhh000206: hibernate.properties not found
2015-7-14 20:58:10 org.hibernate.cfg.environment buildbytecodeprovider
info: hhh000021: bytecode provider name : javassist
2015-7-14 20:58:10 org.hibernate.cfg.configuration configure
info: hhh000043: configuring from resource: /hibernate.cfg.xml
2015-7-14 20:58:10 org.hibernate.cfg.configuration getconfigurationinputstream
info: hhh000040: configuration resource: /hibernate.cfg.xml
2015-7-14 20:58:10 org.hibernate.cfg.configuration addresource
info: hhh000221: reading mappings from resource: org/yang/model/student.hbm.xml
2015-7-14 20:58:10 org.hibernate.cfg.configuration doconfigure
info: hhh000041: configured sessionfactory: null
2015-7-14 20:58:10 org.hibernate.engine.jdbc.connections.internal.drivermanagerconnectionproviderimpl configure
warn: hhh000402: using hibernate built-in connection pool (not for production use!)
2015-7-14 20:58:10 org.hibernate.engine.jdbc.connections.internal.drivermanagerconnectionproviderimpl buildcreator
info: hhh000401: using driver [com.mysql.jdbc.driver] at url [jdbc:mysql://localhost:3306/hibernate]
2015-7-14 20:58:10 org.hibernate.engine.jdbc.connections.internal.drivermanagerconnectionproviderimpl buildcreator
info: hhh000046: connection properties: {user=root, password=****}
2015-7-14 20:58:10 org.hibernate.engine.jdbc.connections.internal.drivermanagerconnectionproviderimpl buildcreator
info: hhh000006: autocommit mode: false
2015-7-14 20:58:10 org.hibernate.engine.jdbc.connections.internal.drivermanagerconnectionproviderimpl configure
info: hhh000115: hibernate connection pool size: 20 (min=1)
2015-7-14 20:58:10 org.hibernate.dialect.dialect
info: hhh000400: using dialect: org.hibernate.dialect.mysqldialect
2015-7-14 20:58:10 org.hibernate.engine.jdbc.internal.lobcreatorbuilder usecontextuallobcreation
info: hhh000423: disabling contextual lob creation as jdbc driver reported jdbc version [3] less than 4
2015-7-14 20:58:10 org.hibernate.engine.transaction.internal.transactionfactoryinitiator initiateservice
info: hhh000399: using default transaction strategy (direct jdbc transactions)
2015-7-14 20:58:10 org.hibernate.hql.internal.ast.astquerytranslatorfactory
info: hhh000397: using astquerytranslatorfactory
hibernate: insert into student (name, age, id) values (?, ?, ?)
2015-7-14 20:58:11 org.hibernate.engine.jdbc.connections.internal.drivermanagerconnectionproviderimpl stop
info: hhh000030: cleaning up connection pool [jdbc:mysql://localhost:3306/hibernate]

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