Como Conectarme A Mysql Desde Jbuilder

[enara]

Buenas, creo que he conseguido conectarme con mysql pero tengo este error:

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com.mysql.jdbc.exceptions.MySQLSyntaxErrorExceptio n: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '[C@13f5d07' at line 1

at com.mysql.jdbc.SQLError.createSQLException(SQLErro r.java:936)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.ja va:2870)

at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:15 73)

at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java :1665)

at com.mysql.jdbc.Connection.execSQL(Connection.java: 3170)

at com.mysql.jdbc.Connection.execSQL(Connection.java: 3099)

at com.mysql.jdbc.Statement.executeQuery(Statement.ja va:1169)
...

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con esto:

int nivelCargo=0;

String url=null;
Connection conn=null;
Statement stmt=null;
ResultSet rset=null;
try {

Class.forName("org.gjt.mm.mysql.Driver").newInstan ce();

String servidor="localhost";
String baseDatos="bd";
String user="usuario";
String passwd="pw";
conn = DriverManager.getConnection(
"jdbc:mysql://"+servidor+"/"+baseDatos+
"?user="+user+"&password="+passwd);
if (conn==null) System.out.println("CONEXION FALLIDA");
stmt=conn.createStatement();
rset=stmt.executeQuery("select p.ncargo from personal p where p.login="+login+" and p.password="+contraseña+"");
if(rset.next()==true){
nivelCargo=rset.getInt("nCargo");
}
}
catch (ClassNotFoundException ex1) {
ex1.printStackTrace();
}
catch (SQLException ex2) {
ex2.printStackTrace();
}
catch (IllegalAccessException ex) {

}
catch (InstantiationException ex) {

}

finally{
try{
rset.close();
stmt.close();
conn.close();
}
catch(SQLException e){
e.printStackTrace();
}
}

ME PODRÍAS DECIR A QUE SE DEBE??

GRACIAS

FELIZ NAVIDAD