JDBC vs. Entity Bean with JBoss

hi,

I'm using currently cygwin with pg7.3.2 (default installation without
optimisations), JDK1.4.1_01, JDBC driver for J2SE 1.4 und JBoss 3.0.6. I
done some test.

create 1000 entries in the same table (id field - number(20), name filed
varchar(40))

JBoss with EJB needed 54 sec.
JBoss with direct SQL needed 47 sec.

why is sql only 7 seconds faster? the CPU usage was about 12%. pg and
jboss are running on the same computer.

and here the code:

private void createFirmSQL(ServletOutputStream out)
throws IOException {
Connection con = null;
PreparedStatement pstmt = null;
ResultSet rs = null;

try {
con = getConnection();

if (con != null) {
String query = "insert into firm values(?,?)";
pstmt = con.prepareStatement(query);

long start = System.currentTimeMillis();
for (int i = 0; i < N; i++) {
// getUniqueLongID need for creating 1.000.000 keys
about 7 seconds.
pstmt.setLong(1,
SQLUtilities.getUniqueLongID().longValue());
pstmt.setString(2, "name " + i);
// commit every time like ejb
pstmt.executeUpdate();
}
long end = System.currentTimeMillis() - start;

out.println("needed " + end + " for creating " + N + "
entries in firm table thru sql");
}
}
catch (SQLException sqle) {
}
finally {
SQLUtilities.getInstance().closeConnections(con, pstmt, rs);
}
}

private void createFirmEJB(ServletOutputStream out)
throws IOException {
// testing entity beans
ServiceLocator serviceLocator = ServiceLocator.getInstance();
FirmLocalHome firmHome = null;

try {
firmHome = (FirmLocalHome)
serviceLocator.getLocalHome(JNDINamesAccess.FIRM_EJB);

long start = System.currentTimeMillis();
for (int i = 0; i < N; i++) {
// firm used the same keygenerator like above
FirmLocal firm = firmHome.create("name " + i);
}
long end = System.currentTimeMillis() - start;

out.println("needed " + end + " for creating " + N + "
entries in firm table thru ejb");
}
catch (ServiceLocatorException sle) {
}
catch (CreateException ce) {
}
}

Best Regards,
Rafal