i'm getting "Cannot load JDBC driver class 'com.ibm.db2.jcc.DB2Driver'"
error but this code works:
working code:

String url = "jdbc:db2://localhost:50000/test";
String user = "user";
String password = "pass";
Class.forName("com.ibm.db2.jcc.DB2Driver");
Connection conn = DriverManager.getConnection(url, user, password);
<<<

context.xml:

<?xml version="1.0" encoding="UTF-8"?>
<Context path="/Test">
   <Resource name="test"
             auth="Container"
             type="javax.sql.DataSource"
             username="user"
             password="pass"
             driverClassName="com.ibm.db2.jcc.DB2Driver"
             url="jdbc:db2://localhost:50000/test"
             />
</Context>
<<<

code not working:

InitialContext ic = new InitialContext();
Context c = (Context)ic.lookup("java:comp/env");

try {
   DataSource ds = (DataSource)c.lookup("test");
   Connection connection = ds.getConnection();
} catch(Exception e) {
   // log e.getMessage();
}
<<<