我配置了DB Broswer 
在hibernate.cfg.xml下面有数据连接的
<session-factory>
<property name="connection.username">root</property>
<property name="connection.url">
jdbc:mysql://localhost/test
</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="myeclipse.connection.profile">mdb</property>
<property name="connection.password">123</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<mapping resource="com/hb/Ptable.hbm.xml" /> </session-factory>
但是启动tomcat 的时候还有出现
java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2847)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:750)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3558)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1151)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:1768)
at com.mysql.jdbc.Connection.<init>(Connection.java:430)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:268)
at java.sql.DriverManager.getConnection(DriverManager.java:525)
at java.sql.DriverManager.getConnection(DriverManager.java:140)谢谢大哥些帮助我一下