Calling a remote JCo destination file

Hi everybody.
This is my first post here in the SAP SDN Forum.
While I'm not a SAP developer, I'm a Java developer. Currently I'm making an application to connect to SAP AS (with JCo 3.0) and retrieve data from BAPI structures and tables. I'm using the JCo 3.0 guide (SAPJCO_Doku_3.0_EN.pdf) successfully but I have some issues:
First: How can I call "remotely" the destination file??? For example: supose first that my destination file, let's say the ABAP_AS_WITHOUT_POOL.jcoDestination file and the Java application are stored in a directory like C:\My Documents\Files, from a first and successful run of the application. With another application in another directory I'd like to call and use that destination file, so in my second application I shouldn't create a second destination file. How can I do it??? What elements and/or properties should I use??? (Maybe the JCoDestination, the DestinationManager, the getRepository and related).
Second: Is it the same for calling a destination file that is in a remote machine??? In a directory like +
255.255.255.255\shared\Files+
I guess if this is in some way equivalent to file reading in Java, but I'm not really sure.
Please help me. Most of the sources I've read didn't say something useful about this, and I need this for my final application.
If you can, please add some generic example-code for a better understanding.
Thanks

JCo provides the interfaces DestinationDataProvider and ServerDataProvider for providing connection/logon data for RFC (remote function call) clients (i.e. Java program calls RFC function on SAP server) or RFC server programs (SAP calls RFC function on Java program acting as a server). When you check the JCO API documentation for usage of those interfaces you'll see that for example for the client you can register your own DestinationDataProvider via method Environment.registerDestinationDataProvider(DestinationDataProvider).
Thus if you don't like the default implementation delivered by SAP (i.e. file based), you can simply create your own class. Note that to some degree the document SAPJCO_Doku_3.0_EN.pdf already points you in the right direction: It mentions on page 8 in section SAP JCo Customizing and Integration:
You should always implement the interface DestinationDataProvider to optimize data security. If you are using server functionality you should also implement ServerDataProvider. These interfaces support the secure storage of critical data.
Cheers, harald

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I was installed sneak preview of Net weaver 6.4,
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J2EE Cluster
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Connection Type
Dictionary Meta Data and application Data
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Then
Msg. Server Connection
Security
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second time
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Can any body please help me to solve this problem.
From past 1 week on wards I have been trying to resolve this. But in vain.

It does not necessarily mean that you have to change that parameter. I read that blog as I had a similar problem, and after reading it and understanding the reasons and possible causes for the error, I found that my particular problem was that I was using "PUBLIC" as the logon group in my JCO destinations, but such a group does NOT exist at my backend. I went to transaction SMLG, had a look at Logon Groups, noted that there were none other than SPACE, figured out that I had to include that information in SLD (Web AS ABAP tech. system --> Message Server --> Logon Groups), put it there. Voilá. It works.
Edit: That SPACE logon group is the one I had to use at JCO destinations. Sorry I forgot to mention that one...
Regards,
Eduardo.
Message was edited by: Jesus Cil

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Hi Team,
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I am pasting the error,
com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to message server host failed Connect_PM TYPE=B MSHOST=<server> GROUP=public R3NAME=<xxx> MSSERV=sapms<yyy> PCS=1 LOCATION CPIC (TCP/IP) on local host with Unicode ERROR service 'sapms<yyy>' unknown TIME Tue Jun 12 16:43:08 2007 RELEASE 700 COMPONENT NI (network interface) VERSION 38 RC -3 MODULE ninti.c LINE 530 DETAIL NiPGetServByName2: service 'sapms<yyy>' not found SYSTEM CALL getservbyname_r COUNTER 4
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Can u pl check for the entry in the services file of the JAVA Engine/portal.
sapmsQ10 36XX/tcp
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format is
sap<SID> Press TAB once 36XX/tcp<Press Enter>
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after some exception the next error follows
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Dear Mahendran
JCO destination will not used for the Web Service Model. While creating the webservice model, you need to use the logical destination which you have created in the Visual Admin.
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You can also refer to
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/900bbf94-a7a8-2910-e298-a651b4706c1e?QuickLink=index&overridelayout=true
Hope it will helps
Best Regards
Arun Jaiswal

Failed JCO destination name 'WD_RFC_METADATA_DEST'    and MODEL DATA

Hi Friends
I am created "WD_RFC_METADATA_DEST". this meta data.When i am created this metadata i was called message server as technical system of CRM server.
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Model Data test
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What is problem. i m not getting can u tell me how slove this problem.
Regards
Vijay Kalluri

Hi Vijay,
You need check following thing to resolve this issue.
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2. Check SLD test is successfull or not.
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Thanks
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BI Post Installation /JCO Destinations

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Hi
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Use WebDynpro JCO Destination in Abstract Portal Component

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Thanks,
Bert

Yes Asusha
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You can call a Jsp file from the abstract portal component.
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Reward for helpful answers

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Error in creating JCO Destination

Hi All
I want to create Adaptive RFC model and after creating JCO destinations when i am trying to execute my application I am getting this error
Can anyone guide...
   com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to message server host failed Connect_PM TYPE=B MSHOST=b0001001 GROUP=PUBLIC R3NAME=B07 MSSERV=sapmsB07 PCS=1 ERROR service 'sapmsB07' unknown TIME Mon Apr 23 16:01:08 2007 RELEASE 700 COMPONENT NI (network interface) VERSION 38 RC -3 MODULE ninti.c LINE 530 DETAIL NiPGetServByName2: service 'sapmsB07' not
found SYSTEM CALL getservbyname_r COUNTER 3
Thanks,Arch

Hi
I made entries in host as well as service files .
192.168.8.42 B0001001      # added by me R/3 System
192.168.9.24           # Portal host
sapmsB07     3610/tcp      # added by me R/3 Msg Server Sevice
I changed the status to PUBLIC in r/3. it was space there.
Now the error I got is.
com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to SAP gateway failed Connect_PM TYPE=B MSHOST=b0001001 GROUP=PUBLIC R3NAME=B07 MSSERV=sapmsB07 PCS=1 LOCATION    CPIC (TCP/IP) on local host with Unicode ERROR       partner '127.0.0.1:3310' not reached TIME        Tue Apr 24 11:06:51 2007 RELEASE     700 COMPONENT   NI (network interface) VERSION     38 RC          -10 MODULE      nixxi.cpp LINE        2764 DETAIL      NiPConnect2 SYSTEM CALL connect ERRNO       10061 ERRNO TEXT WSAECONNREFUSED: Connection refused COUNTER     1
Thanks

ERROR WHEN I CREATE A JCo DESTINATIONS

Hi to all
I have the SLD running. I want create two JCo destinatios. I want create a Web Dynpro application with adaptive RFC Model.
But, I login to http:///webdynpro/dispatcher/sap.com/tcwdtools/Explorer
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500   Internal Server Error
Web Dynpro Container/SAP J2EE Engine/6.40
Failed to process request. Please contact your system administrator.
Error Summary
While processing the current request, an exception occured which could not be handled by the application or the framework.
If the information contained on this page doesn't help you to find and correct the cause of the problem, please contact your system administrator. To facilitate analysis of the problem, keep a copy of this error page. Hint: Most browsers allow to select all content, copy it and then paste it into an empty document (e.g. email or simple text file).
Root Cause
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Can someone say me, why occurs this error ? I have reviewed all my configuration, but I haven´t found nothing.
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Regards
Dario Rodriguez

I think while creating the JCOs you must hav left some field with a NULL value.Try to check out that all the connection properties hav been specified correctly also make sure that the connection pooling has a small range.

Error In JCO Destination Creation

Hi,
I'm creating JCO Destination in Web Dynpro for Java. While finishing the JCO Destination wizard it shows a error as follows:
Root Cause
The initial exception that caused the request to fail, was:
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
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    at java.util.ArrayList.get(ArrayList.java:324)
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    ... 45 more
But the JCO Destination is created successfully and I can test and ping tit successfully. But it becomes the part of System Denied JCO Destinations.
In the server log file I'm getting the following log:
1.5#00112F5374F1005B0000011100000EDC000443BF97417983#1200390062389#com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl#sap.com/tcwddispwda#com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl#Guest#0#####SAPEngine_Application_Thread[impl:3]_14##0#0#Error#1#/System/Server/WebRequests#Plain###Processing HTTP request to servlet [dispatcher] finished with error.
The error is: com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: Cannot navigate via outbound plug tointeractiveForm of view InvoiceListView because there is no navigational link attached to it
Exception id: [00112F5374F1005B0000010F00000EDC000443BF974176DF]#
#1.5#00112F5374F1004F0000055B00000EDC000443BFA0A4587B#1200390219953#com.sap.tc.webdynpro.sessionmanagement#sap.com/tcwddispwda#com.sap.tc.webdynpro.sessionmanagement.ExceptionHandler.handleThrowable#subhayuds#116#####J-Integra for .NET TP Thread 2##0#0#Error#1#/System/UserInterface#Java###Exception occured during processing of a Web Dynpro application: "java.lang.IndexOutOfBoundsException: Index: 0, Size: 0".
[EXCEPTION]
#1#java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
     at java.util.ArrayList.RangeCheck(ArrayList.java:507)
Can anybody help to find out this problem.

Hi,
This is a Web Dynpro bug. You need to apply the latest patch for Web Dynpro runtime.
Regards
Srinivasan T

Creation of JCO Destinations for web dynpro

Hi all,
I read quite a lot of post concerning the subject but unfortunately I did not found a solution to my problem.
My goal is to create JCO Destinations to make my web dynpro to connect to an R3 system.
In order to realise this I followed these steps :
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- In R3, I execute transaction smgw, go to remote gateway to get the gateway settings. I execute RZ70 and filled the parameters just checked. Then I activate and launch the data collect. I have no error message and everythings seemed to work fine.
- In the sld (<host>:<port>/sld) I configured my server settings, the I go to data bridge, set update local sld to true and fill RFC gateway info with the same values as in my R3 system. Then I restarted the sld.
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[code]
Failed to create new JCO client connection WD_FLIGHTLIST_RFC_METADATA_DEST:
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at
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(SystemLandscapeFactory.java:286) at
com.sap.tc.webdynpro.services.sal.sl.api.WDSystemLandscape.createJCOClientConnection(WDSystemLandscape.java:107) at com.sap.tc.webdynpro.tools.sld.ButtonBar.onActionFinish
(ButtonBar.java:224) at com.sap.tc.webdynpro.tools.sld.wdp.InternalButtonBar.wdInvokeEventHandler(InternalButtonBar.java:252) at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.invokeEventHandler(DelegatingView.java:87) at com.sap.tc.webdynpro.progmodel.controller.Action.fire(Action.java:67) at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.handleAction(WebDynproMainTask.java:100) at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.handleActionEvent(WebDynproMainTask.java:299) at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.execute(WebDynproMainTask.java:641) at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:59) at com.sap.tc.webdynpro.clientserver.cal.ClientManager.doProcessing(ClientManager.java:249) at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doWebDynproProcessing(DispatcherServlet.java:154) at
com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:116) at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doPost(DispatcherServlet.java:55) at javax.servlet.http.HttpServlet.service(HttpServlet.java:760) at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:385) at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:263) at
com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:340) at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:318) at
com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:824) at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:239) at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92) at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:147) at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37) at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71) at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37) at java.security.AccessController.doPrivileged(Native Method) at
com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94) at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:162) Caused by: com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: Failed to resolve connection parameter for WD_FLIGHTLIST_RFC_METADATA_DEST at
com.sap.tc.webdynpro.serverimpl.wdc.sl.JCOClientConnection.resolveConnectionParameter4MsgServerJCODestinaton(JCOClientConnection.java:664) at com.sap.tc.webdynpro.serverimpl.wdc.sl.JCOClientConnection.resolveConnectionParameter(JCOClientConnection.java:508) at com.sap.tc.webdynpro.serverimpl.core.sl.AbstractJCOClientConnection.init(AbstractJCOClientConnection.java:247) at com.sap.tc.webdynpro.serverimpl.core.sl.AbstractJCOClientConnection.<init>(AbstractJCOClientConnection.java:221) at
com.sap.tc.webdynpro.serverimpl.wdc.sl.JCOClientConnection.<init>(JCOClientConnection.java:101) at com.sap.tc.webdynpro.serverimpl.wdc.sl.SystemLandscapeFactory.getJCOClientConnection(SystemLandscapeFactory.java:138) ... 30 more Caused by: java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:393) at com.sap.tc.webdynpro.serverimpl.wdc.sl.JCOClientConnection.resolveConnectionParameter4MsgServerJCODestinaton(JCOClientConnection.java:558) ... 35 more[/code]
I tried to create a generic destination (no for the web dynpro tutorial) and failed again.
I do not undestand what I did wrong.
Does someone have an idea ?
Thanks for reading this !
Sylvain
Message was edited by: Sylvain

This thread helped me too because before reading it I didn't thought that I had to create a logon group "PUBLIC".
Anyway I succed in creating 'WD_FLIGHTLIST_MODELDATA_DEST' and the test is ok. The problem was that in sld / technical system / web as abap, my Central Application Server host was wrong. It is not possible to change it so I just add a secondary server with the right host and select this one when creating the destination.
The only pb remaining is now 'WD_FLIGHTLIST_RFC_METADATA_DEST'. I think the pb is my message server such this is the only difference between the two destinations
Thanks for your help
Message was edited by: Sylvain

RFC calls with SAP JCO and IBM resource adapter for SAP - basic tuning

Hi experts,
we are working on a java portal connected to a backend system SAP by calling RFCs.
On our first integration tests, it appears to be quite slow fetching data from SAP by calling the remote functions from the custom portal. We are using SAP JCo 3.0.6 and IBM resource adapter for SAP 7.0.0.3 to integrate SAP with our portal.
Is there any basic tuning to achieve to improve performances or any hint of where to tune in SAP ?
Any help would be greatly appreciated.
Thanks a lot,
Jamal

Hi Jamal,
I understand you have already checked performance issues in the SAP Server. We had some problems with certain RFC calls and it turned out to be a badly developed ABAP sentence.
I'd recommend you to use httpwatch or another tool to check the response times from the browser, so you can point accurately where the is.
Regards
Francisco

Calling a remote JCo destination file

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