R/3 connection from servlet page

Question

Helllo,
I have implemented a servlet page from SAP NetWever Developer Studio:
  1 - J2EE -> Web Module Project for the development
  2 - J2EE -> Enterprise Application Project (EAR) for the deploy
Now I need to access to the R/3 system. It is possible connect to R/3 system from a servlet page? In the portal already exists a system connection created under the section "Syatem Administration -> System Configuration" but I'm trying to implement the connection unsuccessfully (following the Java code used into the servlet):
String sapSystem = "MNT";
IUserAccount uacc = UMFactory.getUserAccountFactory().getUserAccountByLogonId("Administrator");
IUserAccount iuacc = UMFactory.getUserAccountFactory().getMutableUserAccount(uacc.getUniqueID());
IUser user = iuacc.getAssignedUser();
IConnection connection = null;
// get the Connector Gateway Service
IPortalComponentRequest req = (IPortalComponentRequest) request;           => HERE Casting error
Object connectorservice = PortalRuntime.getRuntimeResources().getService(IConnectorService.KEY);
IConnectorGatewayService cgService = (IConnectorGatewayService) connectorservice;
ConnectionProperties cp = new ConnectionProperties(user.getLocale(), user);
connection = cgService.getConnection(sapSystem, req);
String res = "", name = "", path = "";
// Get the Interaction interface for executing the command
IInteraction ix = connection.createInteractionEx();
// Get interaction spec and set the name of the command to run
IInteractionSpec ixspec = ix.getInteractionSpec();
String functionName = "Z_R3_FUNCTION";
// Put Function Name into interaction Properties.
ixspec.setPropertyValue("Name", functionName);
// return structure - parametro di export della funzione
String function_out = "P_PAR";
String function_in_value = "VALUE";
RecordFactory rf = ix.getRecordFactory();
MappedRecord input = rf.createMappedRecord("input");
// put function input parameters
input.put("P_KUNNR", function_in_value);
MappedRecord output = (MappedRecord) ix.execute(ixspec, input);
connection.close();
Object result = output.get(function_out);
Anybody knows how implement it?
Thanks and best regards,
Matteo.

Answer 1

Hello Marcos,
I have followed the example shown in your link, I have found all JAR file, the Java code has not error, I hace deployed my project, but the server returns the error:
java.lang.ExceptionInInitializerError: JCO.classInitialize(): Could not load middleware layer 'com.sap.mw.jco.rfc.MiddlewareRFC'
JCO.nativeInit(): Could not initialize dynamic link library sapjcorfc [no sapjcorfc in java.library.path]. java.library.path [/opt/java1.4/jre/lib/IA64W:/opt/java1.4/jre/lib/IA64W/server:/opt/java1.4/jre/../lib/IA64W:/usr/sap/PCT/JC00/j2ee/os_libs::/usr/sap/PCT/JC00/j2ee/os_libs:/usr/sap/PCT/SYS/exe/run:/usr/sap/PCT/SYS/exe/run:/usr/sap/PCT/SYS/exe/run:/oracle/PCT/sapdata4/SP24/LOGS/J2EE/sapinst_exe.252.1243940833:/usr/lib:/usr/sap/PCT/JC00/j2ee/os_libs:/usr/sap/PCT/JC00/j2ee/os_libs:]
I have notice that into the folder "C:\Program Files\SAP\JDT\eclipse\plugins\com.sap.mw.jco\lib" there is the file sapjcorfc.dll
Do you know if I have to put JAR into a particular folder into my project, or I have to do some configuration on the server?
Thanks and best regards,
Matteo