JCO/JCA

Hi all,
I searched for JCO/JCA topics in the forum, but I confused some terms/usages about them. Could anyone clarify for me:
1. What is different between JCO and JCA? Does JCA have the api to programming as JCO? From EP 6, JCO is deprecated, we use JCA to connect to SAP instead, is it right?
2. With JCO, what is JCO Destination, JCO inbound, JCO outbound? When we need to configure JCO Destination?
3. If we develop a portal application (ex: JSPDynPage)/ a WebDynPro application to get data from SAP, do you need configure JCO (in SLD, in EP, ...) or we just need use JCO API in code? How do we configure it?
4. What is Adaptive RFC?

Hello
a short answer to some of your questions
1. What is different between JCO and JCA?
JCO is a SAP java library to connect to a SAP R/3 System. it can be used by independant (ie non-portal) application.
JCA, as i understand it, is a library whose structure as been defined by Sun, to connect to external system. The JCA implementation in the portal is based on JCO, and is to be used in the portal.
3. If we develop a portal application (ex: JSPDynPage)/ a WebDynPro application to get data from SAP, do you need configure JCO (in SLD, in EP, ...) or we just need use JCO API in code? How do we configure it?
If you use WebDynpro, you configue JCO in the WAS, and then use the plugins to create connections to R/3 RFC Functions.
If you develops standard Iviews (JspDynPage or Dynpage), you use the JCA api to get a connection to an alias, that itself point to a (R/3) system that has been defined in the portal administration.
Regards

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Hey guys,
I'm very new in this field, maybe you can help me how to start....
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Hello,
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<?xml version="1.0" encoding="UTF-8"?>
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best regards

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hello
i´ve browsed the forum for some time to find how to:
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Just as a short partial reply.
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Cheers,
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Hi Allam,
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I have a basic question but I am facing it today so would like to know from SAP folks about it.
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hi,
huuuum, Well BSP or Java ??
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In JCo performance will always be a bottel neck
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https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/documents/a1-8-4/clash of the titans iii.pdf
Hope it helps,
Regards,
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HI,
May i know in witch situation we will go for : 1) Idoc
2) RFC
3) Proxy.
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regards

Hi
IDoc
It is used only for data transfer.It lies on ABAP Atack.also the underlying protocol is tRFC.
RFC
It is used when you need to process data and return values to remote system.That is it is used in synchronous scenarios.It lies on J2EE/Java Stack.It is not a data container like IDoc.It calls a functional module which gets executed.The underlying protocol is HTTP.Communication is done suing JCO/JCA.
Performance wise IDocs are better.
Proxies are used when large amount of data is involved.
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Choosing the Right Adapter.
/people/ravikumar.allampallam/blog/2005/08/14/choose-the-right-adapter-to-integrate-with-sap-systems
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Hi
Why dont you enable RFCs in the SAP system as WebServices and consume them? If you have a very old SAP system then use JCo (JCA) / JRA and connect through the RFC layer.
[Consume Webservices in 7.3|http://help.sap.com/saphelp_nw73/helpdata/en/ca/97f68ba5034d0fb21c518f0cac1432/frameset.htm]
[JCo|http://help.sap.com/saphelp_nw73/helpdata/en/48/64db09c88307dbe10000000a42189b/frameset.htm]
[JRA (JEE Compatibilie, implements JCo)|http://help.sap.com/saphelp_nw73/helpdata/en/48/70796c872c1b5ae10000000a42189c/content.htm]
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After upgrading to EP SP15 I'm now reading that I should stop using JCo for client connection and start using JCA.
I've searched but can't seem to find any step-by-step procedure that shows me how to convert my existing Java code to be JCA-compliant.
Basically, I was doing client = poolEntry.getClient() and then using the client.execute("myrfc"). What code change is required to replace that code with JCA code?
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Hey Mike,
Glad I could help!!
There have been a couple things that I have noticed. If you are using a table as an input parameter, use a table.close() once you are done filling it and before adding it to the importParams("table_name",table) code. I have two scenarios for that. Here is the first:
for (int j = 0; j < exportTable.length; j++) {
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     table.setString("VAR1", exportTable[j][0]);
     table.setString("VAR2", exportTable[j][1]);
table.close();
importParams.put("EXTAB", table);
,and the second one:
table.insertRow();
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table.setString("VAR2", "This is variable 2");
table.close();
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Other than that right now, I haven't really run into any other problems... yet... haha.
Cheers,
Kevin

Difference between JCA and Jco.

Hi Guys,
I am a little confused between JCA and JCo, I am currently working with SAP Portal 6.0 according to its specifications JCo is a depricated and suggests the usage of JCA. On the other hand when I was reading about connecting to an SAP system using java, it suggests the usage of JCo. My knowledge with regard to JCo is limited, so I was wondering if anyone could throw some light here as to what is the difference in using either of them or rather which is the prefered way about going about it.
Thanks in advance..
Rajitha

I think lancea is definitely on the right track.
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JCA (J2EE Connector Architecture) is a general-purpose archiecture and API for allowing external systems and J2EE apps running in an app server to work together. To get a J2EE app working with SAP would require the use of an SAP connector, written to the JCA specs. More than likely, such a connector would itself use Jco. But the J2EE application code would use the connector, not the Jco code directly.
I hope that helps.
- Tim (Sun Microsystems)

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Please let me know whether to use JCo or JCA for java web based development.
Thanks,
Harsha

Hi Harsha,
I think i can give conn infor here itself.
<b>Jco conn from ABAP to Java</b>
=====================
You can use the JCO RFC Provider Service of the Web Application Server for your ABAP to Java calls.
The steps involved in that are
1. Configure destination in SM59 in SAP.
2. Create RFC Destination in Visual Admin.
3. Create a stateless session bean with JNDI name as the name of calling function module in SAP.
4. Add a business method public void processFunction(JCO.Funtion fn) which is called by the JCO RFC Provider Service. The name should be 'processFunction'.
5. Set library references in application-j2ee-engine.xml to type weak for the following
a. com.sap.mw.jco.
b. com.sap.tc.Logging (if you are using the logging api )
Here is the sample code for the EJB biz method
Business Method.
public void processFunction(JCO.Function function) {
try {
// Get the import parameters for the function module
JCO.ParameterList importList = function.getImportParameterList();
logger.infoT("The value sent is" +
(String)importList.getValue("USER_NAME"));
// Set the export parameter value for the function module
JCO.ParameterList export = function.getExportParameterList();
export.setValue("From EJB", "RETURN");
function.setExportParameterList(export);
catch (java.lang.Exception e) {
e.printStackTrace();
<b>Jco conn from Java to others(ex:ABAP)</b>
=====================-==========
     Open Visual Admin(C:\usr\sap\SID\JCxx\j2ee\admin\go.bat) and connect to server
     Go to Destinations service
     Open HTTP Settings Tab
     Add/Edit destination SLD_DataSupplier and type following values
URL http://xyz.corp:53000
Authentication - BASIC
User dynproxxx
Password - bp52st000
     Press save and test (if you get response code 200 everything is o.k.)
     Add/Edit other HTTP Destination named SLD_Client with the same values as SLD_DataSupplier:
URL http://xyz.corp:53000
Authentication - BASIC
User dynproxxx
Password - bp52st000
     Press save and test (if you get response code 200 everything is o.k.)
     Go to SLD Data Supplier service.
     Press the button named: Send the Data to SLD and confirm triggering SLD Data transfer (if you receive successful message everything is o.k.).
===================
following blog might helpfull
=======================
/people/michal.krawczyk2/blog/2005/03/10/registering-a-new-technical-system-in-sld--abap-based
for basic infor
==============
http://help.sap.com/saphelp_nw04s/helpdata/en/21/84570b3ae14e77b3047c82218974b9/frameset.htm
Award points if it helps

JCO x JCA

Hi,
which of these is recommended to use and why?
thanks
JJ

Hi Jiri,
JCo is the SAP specific way to access SAP from Java. It has been the officially recommended but proprietary technology as long as there hasn't been a generic solution for accessing "backends" (EIS). For history reasons this holds for EP5.
JCA is such a generic technology ( see http://java.sun.com/j2ee/connector/index.jsp ). So it has also become the officially recommended technology for accessing SAP from EP6 on.
Hope it helps
Detlev

JCA vs JCo

Hi,
When is it better to use JCo (through the SAP Connector wizards in the IDE or 'manually'), and when is it better to use JCA?
In case of JCA, are there any IDE wizards?
Thanks
Dov

Hi Zornitsa,
Here is what I see at the Log Viewer...
10:07:39.595    0 INFO    LicensingManager started for 40 ms.
10:07:43.442    0 ERROR   service cross - jar file C:\usr\sap\DB0\JC00\j2ee\cluster\server0\bin\services\cros
.jar does not exist.
10:07:43.613    1 ERROR   java.io.FileNotFoundException: C:\usr\sap\DB0\JC00\j2ee\cluster\server0\bin\service
\cross.jar
        at com.sap.engine.frame.core.load.res.JarResource.openJar(JarResource.java:401)
        at com.sap.engine.frame.core.load.res.JarResource.getClassInfo(JarResource.java:130)
        at com.sap.engine.frame.core.load.res.JarsResource.getClassInfo(JarsResource.java:41)
        at com.sap.engine.frame.core.load.ResourceLoader.loadLocalClass(ResourceLoader.java:249)
        at com.sap.engine.frame.core.load.ResourceLoader.loadClass(ResourceLoader.java:143)
        at com.sap.engine.frame.core.load.ReferencedLoader.loadClass(ReferencedLoader.java:303)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:219)
        at com.sap.engine.core.service630.container.ServiceRunner.run(ServiceRunner.java:132)
        at com.sap.engine.frame.core.thread.Task.run(Task.java:60)
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10:07:43.773    1 ERROR   Service cross error. Nested exception is: java.lang.ClassNotFoundException: com.sap
engine.services.cross.CrossFrame
Loader Info -
ClassLoader name: [service:cross]
Parent loader name: [Frame ClassLoader]
References:
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Resources:
   C:\usr\sap\DB0\JC00\j2ee\cluster\server0\bin\services\cross.jar
Loading model: {parent,local,references}
        at com.sap.engine.frame.core.load.ReferencedLoader.loadClass(ReferencedLoader.java:314)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:219)
        at com.sap.engine.core.service630.container.ServiceRunner.run(ServiceRunner.java:132)
        at com.sap.engine.frame.core.thread.Task.run(Task.java:60)
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10:07:43.773    1 ERROR   Core service cross failed. J2EE Engine cannot be started. --> java.lang.ClassNotFou
dException: com.sap.engine.services.cross.CrossFrame
Loader Info -
ClassLoader name: [service:cross]
Parent loader name: [Frame ClassLoader]
References:
   interface:cross
Resources:
   C:\usr\sap\DB0\JC00\j2ee\cluster\server0\bin\services\cross.jar
Loading model: {parent,local,references}
        at com.sap.engine.frame.core.load.ReferencedLoader.loadClass(ReferencedLoader.java:314)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:219)
        at com.sap.engine.core.service630.container.ServiceRunner.run(ServiceRunner.java:132)
        at com.sap.engine.frame.core.thread.Task.run(Task.java:60)
        at com.sap.engine.core.thread.impl5.SingleThread.execute(SingleThread.java:72)
        at com.sap.engine.core.thread.impl5.SingleThread.run(SingleThread.java:126)
10:07:43.442    0 ERROR   service cross - jar file C:\usr\sap\DB0\JC00\j2ee\cluster\server0\bin\services\cros
.jar does not exist.
10:07:43.773    1 ERROR   Service cross error. Nested exception is: java.lang.ClassNotFoundException: com.sap
engine.services.cross.CrossFrame
Loader Info -
ClassLoader name: [service:cross]
Parent loader name: [Frame ClassLoader]
References:
   interface:cross
Resources:
   C:\usr\sap\DB0\JC00\j2ee\cluster\server0\bin\services\cross.jar
Loading model: {parent,local,references}
        at com.sap.engine.frame.core.load.ReferencedLoader.loadClass(ReferencedLoader.java:314)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:219)
        at com.sap.engine.core.service630.container.ServiceRunner.run(ServiceRunner.java:132)
        at com.sap.engine.frame.core.thread.Task.run(Task.java:60)
        at com.sap.engine.core.thread.impl5.SingleThread.execute(SingleThread.java:72)
        at com.sap.engine.core.thread.impl5.SingleThread.run(SingleThread.java:126)
10:07:43.773    1 ERROR   Core service cross failed. J2EE Engine cannot be started.
10:07:43.823    2 INFO    Service runtimeinfo started. (20 ms).
And here is what I see in the Developer Studio Log:
17/08/2004 10:10:23 /userOut/deploy (com.sap.ide.eclipse.sdm.threading.DeployThreadManager) [Deploy Thread] ERROR:
MinhaApp.ear -> Deployment aborted
DEPLOYMENT ...
==> SDM host : C5057943L
==> SDM port : 50018
==> URL : file:/C:/DOCUME1/C5057943/LOCALS1/Temp/temp23923MinhaApp.ear
... ABORTED
Aborted: development component 'MinhaApp'/'sap.com'/'localhost'/'2004.08.16.12.14.47':
SDM could not start the J2EE cluster on the host C5057943L! The online deployment is terminated. A timeout occured during the cluster running verification!
(message ID: com.sap.sdm.serverext.servertype.inqmy.extern.EngineApplOnlineDeployerImpl.performAction(DeploymentActionTypes).STARTUP_CLUSTER)
Reason:
... ABORTED
Aborted: development component 'MinhaApp'/'sap.com'/'localhost'/'2004.08.16.12.14.47':
SDM could not start the J2EE cluster on the host C5057943L! The online deployment is terminated. A timeout occured during the cluster running verification!
(message ID: com.sap.sdm.serverext.servertype.inqmy.extern.EngineApplOnlineDeployerImpl.performAction(DeploymentActionTypes).STARTUP_CLUSTER)
DEPLOYMENT ...
==> SDM host : C5057943L
==> SDM port : 50018
==> URL : file:/C:/DOCUME1/C5057943/LOCALS1/Temp/temp23923MinhaApp.ear
... ABORTED
Aborted: development component 'MinhaApp'/'sap.com'/'localhost'/'2004.08.16.12.14.47':
SDM could not start the J2EE cluster on the host C5057943L! The online deployment is terminated. A timeout occured during the cluster running verification!
(message ID: com.sap.sdm.serverext.servertype.inqmy.extern.EngineApplOnlineDeployerImpl.performAction(DeploymentActionTypes).STARTUP_CLUSTER)
Thank you very much again!
Dov

Custom iView Connecting to SAP R/3 system using JCA !!

I did not get any response on the Portal forum so posting it again in the WebAs forum ...
Environment : SAP Portal : EP 6.p SP2
I am using JCA to connect to the SAP backend systems.
The following code connects to the backend ...
IConnectionFactory connectionFactory = (IConnectionFactory) ctx.lookup("EISConnections/SAPFactory");
IConnectionSpec spec = connectionFactory.getConnectionSpec();
((Map) spec).put("client", "CLIENT_NUMBER");
((Map) spec).put("UserName", "YOUR_LOGIN_ID");
((Map) spec).put("Password", "YOUR_PASSSWORD");
((Map) spec).put("logonmethod", "UIDPW"); // or SAPLOGONTICKET
((Map) spec).put("Language", "YOUR_LOGIN_LANGUAGE");
((Map) spec).put("ashost", "YOUR_APPLICTION_SERVER_NAME");
((Map) spec).put("sysnr", "YOUR_SYSTEM_NUMBER");
IConnection client = connectionFactory.getConnectionEx(spec);
I want to use the message server for load balancing. Is there a way to specify the message server and logon group ??
These is the code to get the BAPI information ...
// Create interaction
IInteraction interaction = client.createInteractionEx();
IInteractionSpec interactionSpec = interaction.getInteractionSpec();
interactionSpec.setPropertyValue("Name", "REMOTE_FUNCTION_MODULE_NAME");
// Create IFunction instance
IFunctionsMetaData functionsMetaData = client.getFunctionsMetaData();
IFunction function
= functionsMetaData.getFunction("REMOTE_FUNCTION_MODULE_NAME");
// CCI api only has one datatype: Record
RecordFactory recordFactory = interaction.getRecordFactory();
MappedRecord importParams
= recordFactory.createMappedRecord("CONTAINER_OF_IMPORT_PARAMS"
and the following code populates the input table parameters ...
IStructureFactory structureFactory
= interaction.retrieveStructureFactory();
IRecordSet table
= (IRecordSet) structureFactory.getStructure(
function.getParameter("TABLE_NAME").getStructure());
table.insertRow();
table.setString("COLUMN_NAME_1", "VALUE_1");
table.setString("COLUMN_NAME_2", "VALUE_2");
table.insertRow();
table.setString("COLUMN_NAME_1", "VALUE_1");
table.setString("COLUMN_NAME_2", "VALUE_2");
importParams.put("TABLE_NAME", table);
The above code causes performance issues in the SAP system because the code is calling the following other BAPI through the JCA java api ...
1) RFC_GET_FUNCTION_INTERFACE
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Looks like, the JCA library is not caching the metadata information for the BAPI instead for each call, it is calling other BAPI's to get the BAPI metadata information. Also, if I reuse the same IFunction class instance for all connections (Using Singleton Class), it seems to make less "RFC_GET_FUNCTION_INTERFACE" bapi calls.
The problem is with the input table structure which I need to populate for the BAPI. Every time the structure is populated, the internal BAPI's are getting called and it takes more time to populate the structure as number of users increases.
I am looking answers to the following questions ...
1) Specify message and logon group in JCA
2) Provide a way to cache the metadata for the BAPI's
More details about JCA can be found here ...
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/bc9baf90-0201-0010-479a-b49b25598ebf
I appreciate your help !!
Thanks
Bhabesh Patel

we updated JCO to the latest version for EP 6 SP2 Patch 8 and it fixed the issue.

JCO/JCA

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