SAP JCo 3.0 - too many network connections

[Former Member]

I have implemented a standalone JCo-Client which has to make multiple calls to the same BAPI.

Java 1.5

SAP JCo 3.01

Windows Server 2003

Now I have the problem that each BAPI-Call opens a new network connection (checked with netstat). I use a pooled connection, I have only one JCoDestination object and one JCoFunction object on which I do many function.execute(destination).

Under JCO 2 i used a ClientPool and didn't have the increasing number of network connections.

Any ideas how to solve this.

I add the rump coding so you get the idea:

String destinationName = "ConnPool";

Properties connectProperties = new Properties();
connectProperties.setProperty(DestinationDataProvider.JCO_ASHOST, "XXX");
	...
connectProperties.setProperty(DestinationDataProvider.JCO_POOL_CAPACITY, "5");
connectProperties.setProperty(DestinationDataProvider.JCO_PEAK_LIMIT,   "5");
createDestinationDataFile(destinationName, connectProperties);

int count = 0;

try {
    JCoDestination destination = JCoDestinationManager.getDestination(destinationName);
    JCoFunction function = destination.getRepository().getFunction("BAPI_NAME");
    if (function == null)
        throw new RuntimeException("BAPI not found in SAP.");

    do {
        count++;
        try {
            JCoStructure importStruktur = function.getImportParameterList().getStructure("IMPORT");
                ...
            function.execute(destination);
            JCoStructure exportStruktur = function.getExportParameterList().getStructure("EXPORT");
                ...
        } 
        catch (AbapException e) {
            System.out.println(e.toString());
        }
    } while (count < 50000);

}
catch(JCoException ex) {
    System.out.println(ex.toString());
}

Edited by: Jochen Lang on Apr 29, 2009 1:30 PM

[Former Member]

Further testing showed that Pooling connections doesn't affect the number of actual network connections generated.

But with encapsulating the numerous function-calls into a Stateful Connection via

JCoContext.begin(destination);
...lots of function calls...
JCoContext.end(destination);

only one network connection would be used. Sadly I can't use this in my actual application.

Your comments and experiences to this are appreciated!

Greetings Jochen