Java RFC Connection: Step by step

[Former Member]

Hi folks,

my first goal is to achieve a remote function call from Java to SAP or the other way.

My first attempt is a Java application which does a RFC to a SAP ABAP function that returns me some database data, but more about that later.

The first thing where i already fail is to build up a simple connection between Java and SAP.

I tried it with JCo v2.1.x and JCo v3.x (Which version should i prefer? are there advantages, disadvantages?)

Here are the two approaches:

{JCO v2.1.x}:

		
JCO.Client myConnection = JCO.createClient("001",
												   "***", 
												   "****", 
												   "DE", 
												   "***", 
												   "00");
myConnection.connect();
...
...

I get a "(103) RFC_ERROR_LOGON_FAILURE: Userid or password incorrect". I put in my normal SAP GUI account. Its not an admin account but i can create reports etc in the ABAP Editor.

I checked the spelling several time and it should be ok. Why does it say incorrect user or password?

Is this possible because of insufficient rights?

{JCo v3.x}:

I just tried the "StepByStepClient" example included in the sapjco3 download and i saw that every connect function begins with a "JCoDestination destination = JCoDestinationManager.getDestination(String);" line.

But what exactly does this getDestination function do? What string do i pass there? In the example is it JCoDestinationManager.getDestination("ABAP_AS_WITHOUT_POOL"); but then i get the error: ""(106) JCO_ERROR_RESOURCE: Destination ABAP_AS_WITHOUT_POOL could not be created:"..

Can anyone explain me how this works?

Thanks in advance!

[Former Member]

Well as far as calling a RFC from java is concerned....below is code that worked fine for me.

JCO.Client connClient = null;
        IRepository mRepository;
	connClient = JCO.createClient("<SAP Client>","<UserId>","<Password>","EN","<Application server host name>","<system number>");
        try {
	connClient.connect();
	} catch (Exception ex)
	{
		ex.printStackTrace();
		System.exit(1);
	}
	mRepository = new JCO.Repository("Hell", connClient);
	JCO.Function strHELLO = mRepository.getFunctionTemplate("ZSAU_FM_ASSIGNMENT").getFunction();
	JCO.ParameterList importParam = strHELLO.getImportParameterList();
	importParam.setValue(val,"ZMATNR");
	try {
		connClient.execute(strHELLO);
	}catch (JCO.AbapException ex)
			{
			}

Make sure you have followed procedure mentioned under:

http://help.sap.com/saphelp_nw04/helpdata/en/47/80f671ee6e4b41b63c0fe46bd6e4f8/content.htm