SAP NW CE: Establishing an RFC Connection Using an Existing Destination

[Former Member]

Hello,

I want to establishing an RFC connection using an existing destination.

My code:

private static final String USER = "Administrator";
	private static final String PASSWORD = "********";
	private static final String SAP_NAMING_PROVIDER_URL = "vm-sapnwce:50004";
	private static final String SAP_INITIAL_CONTEXT_FACTORY_IMPL = "java.naming.factory.initial";

	public List<Person> findPerson(String employeeID, String name,
			Date dateOfBirth) {

		/*
		 * JNDI service naming environment properties initialization
		 */
		Properties ctxProp = new Properties();
		ctxProp.put(Context.INITIAL_CONTEXT_FACTORY,
				SAP_INITIAL_CONTEXT_FACTORY_IMPL);
		ctxProp.put(Context.PROVIDER_URL, SAP_NAMING_PROVIDER_URL);
		ctxProp.put(Context.SECURITY_PRINCIPAL, USER);
		ctxProp.put(Context.SECURITY_CREDENTIALS, PASSWORD);

		/*
		 * Create a JNDI API InitialContext object.
		 */
		Context jndiContext = null;
		try {
			jndiContext = new InitialContext(ctxProp);
		} catch (NamingException e) {
			System.out.println("Could not create JNDI API" + "context: "
					+ e.toString());
			e.printStackTrace();
			System.exit(1);
		}
		
		/*
		 * Create a JNDI API InitialContext object.
		 */
		DestinationService dstService = null;
		RFCDestination dst = null;
		try {
			dstService = (DestinationService) jndiContext.lookup(DestinationService.JNDI_KEY);
			if (dstService == null)
				throw new NamingException("Destination Service not available");
			dst = (RFCDestination) dstService.getDestination("RFC",
					"TDE");
		} catch (NamingException e1) {
			e1.printStackTrace();
		} catch (RemoteException e) {
			e.printStackTrace();
		} catch (DestinationException e) {
			e.printStackTrace();
		}		
		Properties jcoProperties = dst.getJCoProperties();

		/*
		 * Establishing a direct connection
		 */
		JCO.Client jcoClient = JCO.createClient(jcoProperties);
		jcoClient.connect();
...

But if I execute the method the jstart.EXE in sapmmc go in status "Some processes running" and the AS restarts.

Error in NWDS:

Nov 20, 2007 1:46:48 PM [1195562808569]:Error   : Thread[Thread-10,5,main]      ...rvices.rmi_p4.Parser.newRequest(ClientConnection):    The possible problem is that there is no available working correctly server node. Check your working servers
com.sap.engine.services.rmi_p4.P4ConnectionException: Error. Check your available working servers.
	at com.sap.engine.services.rmi_p4.P4ObjectBrokerClientImpl.getException(P4ObjectBrokerClientImpl.java:630)
	at com.sap.engine.services.rmi_p4.P4ObjectBrokerClientImpl.getException(P4ObjectBrokerClientImpl.java:612)
	at com.sap.engine.services.rmi_p4.Parser.newRequest(Parser.java:143)
	at com.sap.engine.services.rmi_p4.ClientConnection.run(ClientConnection.java:390)
	at java.lang.Thread.run(Thread.java:595)

If I execute the methode with the following code instead of the code above I can execute the method without any problems:

JCO.Client jcoClient = JCO.createClient("011", "Restle", "********",
"en", "sma82", "01");
jcoClient.connect();

Regards,

Armin

[Former Member]

Hi armin,

did you debugged your method and watched your jcoProperties, before creating the client?

Regards, Jens

[Former Member]

Hello,

I solved the problem.

workaround:

I changed

private static final String SAP_INITIAL_CONTEXT_FACTORY_IMPL = "java.naming.factory.initial";

to

private static final String SAP_INITIAL_CONTEXT_FACTORY_IMPL = "com.sap.engine.services.jndi.InitialContextFactoryImpl";

[Vlado]

Yep, but I wouldn't call it a workaround. It's actually how it needs to be, so it's more of a mandatory fix

"java.naming.factory.initial" is the value of the constant Context.INITIAL_CONTEXT_FACTORY => it's definitely wrong.