oracle connection access denied

hi there,
i am a new bee and i am trying to connect oracle database.
i can make the connection and run some query and display the result
from a java console application.
but when i want to connect from my service imlementation class, i
always get an access denied error. i have been trying to find a
solution, serching on google but nothing.

here is the code i use to connect:

final String queryString = "select * from SBS_MUHATAP WHERE NO=357";
Connection con = null;
Statement stmt = null;
ResultSet rset = null;

try {
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
con = DriverManager.getConnection
("jdbc:oracle:thin:@192.168.0.12:1521:db_name", "userID",
"userPassword");
stmt = con.createStatement();
rset = stmt.executeQuery(queryString);

while (rset.next()) {
sonuc = rset.getString(5) + " " + rset.getString(6);
}
rset.close();
stmt.close();

}

as soon a the line con= DriverManager.getConnection runs, i get the
exception saying:
......
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at org.mortbay.io.nio.SelectChannelEndPoint.run
(SelectChannelEndPoint.java:396)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run
(BoundedThreadPool.java:442)
Caused by: java.security.AccessControlException: access denied
(java.net.SocketPermission 192.168.0.12:1521 connect,resolve)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
......

what am i doing wrong, please help

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