What happens if JCO.Client object not disconnected?

Question

Hi All,
Can anyone tell me what happens if a JCO.Client( which is connected to SAP) is not disconnected? Will it be connected? or JCO disconnects it after sometime? or SAP itself disconnects it?
  JCO.Client client = JCO.createClient(....);
  client.connect();
If I run this simple code and leave it, what will happen to the connection opened?
Thanks in advance.

Answer 1

We are using JCO with SAP J2EE and have found something strange.  We are setting the idle_timeout property and the SAP user is logging off, however we accumulate DISCONNECTED sessions in the SAP gateway.  If the gateway limit is reached, additional connections fail.  We used a modified version of the sample program to isolate the problem.
Test Program:
import java.io.IOException;
import com.sap.mw.jco.*;
public class Test {
    public static void main(String args[]) {
        byte instring[] = new byte[20];
        JCO.Client jcoClient = JCO.createClient("200", "user", "password", "EN",
                "bhha.na.pg.com", "00");
        jcoClient.setProperty("idle_timeout","60");    
        jcoClient.connect();
        System.out.print("Read:");
        System.out.flush();
        try {
            System.in.read(instring);
        } catch (IOException e) {
            e.printStackTrace();
During 60 second period, transaction smgw shows the following information as expected.  There is also a logged in user in SM04.
   44  7BWGF21  javaw    t0331        CONNECTED    <unknown 99703871 INT  15:13:10 0    0
After 60 seconds, the user disappears from SM04, however the smgw connection goes to a disconnect state as follows.
   44  7BWGF21  javaw    t0331        DISCONNECT   <unknown 99703871 INT  15:14:44 0    0
This session stays in this state until the enter key is pressed and the java app terminates.  This is problem with a J2EE server app were the java process does not terminate.
Thanks,
Harry