JDBC java与oracle数据库连接问题

import java.sql.*;

public class TestJDBC {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:sys","sys","root");
} catch(SQLException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}


出错信息：
java.sql.SQLException: ORA-28009: connection to sys should be as sysdba or sysoper

at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:124)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:304)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:271)
at oracle.jdbc.driver.T4CTTIoauthenticate.receiveOauth(T4CTTIoauthenticate.java:644)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:298)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:343)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:147)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:31)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:545)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at TestJDBC.main(TestJDBC.java:12)