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SAP software solutions are widely used among product and process oriented enterprises for finance, operations, HR and many other aspects of the business. SAP ERP solutions provide reliable and efficient platforms to build and integrate enterprise or business-wide data and information systems with ease.

One of the drawbacks however is vendor lock-in and the relative inflexibility of SAP solutions to align itself with the business model or customization required. Having understood these challenges, SAP software vendors are moving towards exposing their solutions to SOA.

WSO2 ESB on the other hand leverages the best of both worlds by supporting technologies along with native SOA integration technologies. It has the capability to connect existing SAP based solutions of an enterprise with other data/business oriented systems and to mix-and-match user requirements with minimal effort. As a result, enterprises can keep parts of their systems independent of SAP and extensible for many other systems, solutions and middleware.

This section describes how to set up WSO2 ESB in a SAP environment, how to install the SAP JCo middleware library, SAP Intermediate Document (Idoc) and Business Application Programming Interface (BAPI) adapters.

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Installing WSO2 SAP Adapter

The WSO2 SAP adapter is written as a transport for WSO2 ESB. The relevant jar is org.wso2.carbon.transports.sap-VERSION.jar (e.g. org.wso2.carbon.transports.sap-1.0.jar). Follow the steps below to install and set up.

1. Download and install WSO2 ESB using instruction given in section Getting Started.

2. Download the sapidoc3.jar and sapjco3.jar middleware libraries from SAP support at http://service.sap.com/connectors, and copy them to <ESB_HOME>/repository/components/lib directory.

3. Copy the native SAP jco library to the system path. Pick the system path relevant to your operating system from the list below.

Linux 32-bit

Copy the Linux native SAP jco library (libsapjco3.so) to <JDK_HOME>/jre/lib/i386/server.

Linux 64-bit

Copy the Linux native SAP jco library (libsapjco3.so) to <JDK_HOME>/jre/lib/amd64.

Windows

Copy the Windows native SAP jco library (sapjco3.dll) to <WINDOWS_HOME>/system32.

4. Copy the SAP endpoint property files to <ESB_HOME>/repository/conf/sap. When communicating with an external SAP endpoint using IDoc or BAPI, there are two property files for server-side and client-side as follows:

  • *.dest - SAP endpoint properties when the ESB acts as the client to an external SAP endpoint.
  • *.server - SAP endpoint properties when the ESB acts as the server to an external SAP endpoint.

The SAP client and server properties file should be available with its name according to the property transport.sap.serverName for server, and the endpoint name for the destination. The next section explains this in detail.

5. Start the ESB using the -Djava.library.path switch to specify the location of your SAP jco library. For example:

./wso2server.sh -Djava.library.path=/usr/lib/jvm/jre1.7.0/lib/i386/server/

Configuring WSO2 SAP Adapter

As noted earlier, the SAP adapter was written as a new transport for the WSO2 ESB. This transport consists of two parts as follows.

  • BAPI/RFC transport
  • IDoc transport

Just as a normal transport, define each of these transports' receiver/sender configurations in <ESB_HOME>/repository/conf/Axis2/axis2.xml file. Examples are given below for your reference.

BAPI/RFC Adapter

transportSender:

Code Block
languagehtml/xml
<transportSender name="bapi" class="org.wso2.carbon.transports.sap.SAPTransportSender"/>

transportReceiver:

Code Block
languagehtml/xml
<transportReceiver name="bapi" class="org.wso2.carbon.transports.sap.SAPTransportListener"/>
IDoc Adapter

transportSender:

Code Block
languagehtml/xml
<transportSender name=”idoc” class="org.wso2.carbon.transports.sap.SAPTransportSender"/>

transportReceiver:

Code Block
languagehtml/xml
<transportReceiver name=”idoc” class="org.wso2.carbon.transports.sap.SAPTransportListener"/>

The table below summarizes how to define a SAP endpoint and a proxy service.

...

BAPI/RFC adapter

...

Code Block
languagehtml/xml
<endpoint name="sapbapiendpoint">
  <address
 uri="bapi:/JCOCLIENT01"/>
</endpoint>

The SAP endpoint client property file should be in <ESB_HOME>//repository/conf/sap/JCOCLIENT01.dest.

...

Code Block
languagehtml/xml
<proxy name=”sapbapiproxy” transports=”bapi”/>
//in,out,fault Sequence
  <parameter name="transport.sap.serverName">  
    JCOSERVER01
  </parameter>
// other parameters
</proxy>

SAP endpoint server property file should be in <ESB_HOME>/repository/conf/sap/JCOS ERVER01.server

...

Systems, Applications, and Products (SAP) for data processing is an industry leading enterprise software solution that is widely used among product and process oriented enterprises for finance, operations, HR and many other aspects of a business. SAP ERP solutions provide reliable and efficient platforms to build and integrate enterprise or business-wide data and information systems with ease. 

WSO2 ESB leverages the best of both worlds by providing the integration layer so that an existing SAP R/3 based solutions of an enterprise can be integrated with other data/business oriented systems so that you can mix-and-match requirements with minimal effort. As a result, enterprises can keep parts of their systems independent of SAP and extensible for many other systems, solutions and middleware.

The WSO2 SAP adapter is shipped with WSO2 ESB and is implemented as a transport for WSO2 ESB. This is provided in the <ESB_HOME>/repository/components/plugins directory as org.wso2.carbon.transports.sap-VERSION.jar (e.g. org.wso2.carbon.transports.sap_1.0.0.jar).

The WSO2 SAP adapter has full IDoc and experimental BAPI support. It used the SAP JCO library as the underlying framework to communicate with SAP. This section describes how to set up WSO2 ESB in a SAP environment, how to install the SAP JCo middleware library, SAP Intermediate Document (IDoc) and Business Application Programming Interface (BAPI) adapters.

...

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...

Installing WSO2 SAP Adapter

Follow the instructions below to install and set up the ESB SAP adapter.

  1. Download and install WSO2 ESB by following the instruction in Getting Started.

  2. Download the sapidoc3.jar and sapjco3.jar middleware libraries from the SAP support portal and copy those libraries to the <ESB_HOME>/repository/components/lib directory.

    Info
    titleNote

    You need to have SAP login credentials to access the SAP support portal.

  3. Download the native SAP JCo library and copy it to the system path. You need to select the system path applicable to your operating system as described below.

    Linux 32-bit

    		Copy the Linux native SAP jco library libsapjco3.so to <JDK_HOME>/jre/lib/i386/server.

    Linux 64-bit

    		Copy the Linux native SAP jco library libsapjco3.so to <JDK_HOME>/jre/lib/amd64.

    Windows

    		Copy the Windows native SAP jco library sapjco3.dll to <WINDOWS_HOME>/system32.

  4. Create a directory named sap in the <ESB_HOME>/repository/conf/ directory and provide access rights to read the properties files you will save in it later.

  5. Copy the following SAP endpoint property files to the <ESB_HOME>/repository/conf/sap directory. You need to have two property files, one at the server-end and the other at the client-end to communicate with an external SAP endpoint using IDoc or BAPI.

    • *.dest : This is where we keep SAP endpoint parameters when WSO2 ESB should act as a client to an external SAP endpoint.  
    • *.server : This is where we keep SAP endpoint parameters when WSO2 ESB should act as a server to an external SAP endpoint.
    For details on creating the property files and defining the relevant properties, see Setting up the *.dest and *.server property files.
  6. Start the ESB using the -Djava.library.path switch to specify the location of your SAP jco library.
    For example ./wso2server.sh -Djava.library.path=/usr/lib/jvm/jre1.7.0/lib/i386/server/

...

Configuring WSO2 SAP Adapter

As mentioned above, the SAP adapter is implemented as a transport for WSO2 ESB. This transport consists of two parts as follows:

  • BAPI/RFC adapter
  • IDoc adapter

Just like any other transport, you need to enable the BAPI/RFC adapter as well as the IDoc adapter in order to use the SAP adapter.

To enable the BAPI/RFC adapter

  • Edit the <ESB_HOME>/repository/conf/axis2/axis2.xml file and uncomment the BAPI sender and listener as follows:

    Code Block
    languagexml
    <transportSender name="bapi" class="org.wso2.carbon.transports.sap.SAPTransportSender"/>
...
<transportReceiver name="bapi" class="org.wso2.carbon.transports.sap.SAPTransportListener"/>
To enable the IDoc adapter

  • Edit the <ESB_HOME>/repository/conf/axis2/axis2.xml file and uncomment the IDoc sender and listener as follows:

    Code Block
    languagexml
    <transportSender name=”idoc” class="org.wso2.carbon.transports.sap.SAPTransportSender"/>
...
<transportReceiver name=”idoc” class="org.wso2.carbon.transports.sap.SAPTransportListener"/>

Anchor
SetupPropertyFiles
SetupPropertyFiles

...

Setting up the *.dest property file

To setup WSO2 ESB as a client to a SAP system you need to create the *.dest property file and define the relevant properties. The following table lists the properties and the description of each property that should be specified in the *.dest property file.

PropertyDescription

jco.client.client

Client logon

jco.client.user

User logon

jco.client.alias_user

Alias user name

jco.client.passwd

Logon password

jco.client.lang

Logon language

jco.client.sysnr

R/3 system number

jco.client.ashost

R/3 application server

jco.client.mshost

R/3 message server

jco.client.gwhost

Gateway host

jco.client.gwserv

Gateway service

jco.client.r3name

R/3 name
jco.client.group Group of application servers

jco.client.tpname

Program ID of external server program
jco.client.tphost Host of external server program

jco.client.type

Type of remote host (3=R/3, E=External)
jco.client.codepage Initial code page for logon

jco.client.use_sapgui

Use remote SAP graphical user interface

jco.client.mysapsso2

Use the specified SAP cookie version 2 as the logon ticket
jco.client.grt_data Additional data for GUI

jco.client.use_guihost

Host to which the remote GUI is redirected

jco.client.use_guiserv

Service to which the remote GUI is redirected
jco.client.use_guiprogid Progid of the server that starts the remote GUI
jco.client.snc_partnername

SNC partner name (for example, CN=B20, O=SAP-AG, C=DE\) snc_mode

jco.client.snc_mode

SNC mode (0 or 1)

jco.client.snc_qop

SNC level of security (1-9)

jco.client.snc_myname

SNC name; overrides default SNC partner
jco.client.snc_lib Path to the library

jco.client.Dest

R/2 destination

jco.client.saplogon_id

SAPLOGON string on 32-bit Windows

jco.client.extiddata

Data for external application (PAS)

jco.client.extidtype

Type of external authentication (PAS)

jco.client.x509cert

Use the specified X509-certificate as the logon ticket

jco.client.msserv

R/3 port number of message server

jco.client.profile_name

Profile name used for shared memory communication

jco.client.idle_timeout

Idle timeout for the connection

jco.client.ice Ignore

RFC library character conversion errors (1 or 0)

jco.client.logon

Enable or disable logon check at open time (1 or 0)

jco.client.trace

Enable or disable RFC trace (1 or 0)

jco.client.abap_debug

Enable ABAP debugging (1 or 0)

jco.client.getsso2

Get or do not get a SSO ticket after logon (1 or 0)

jco.client.toupper

Enable or disable uppercase character conversions for logon
Info
titleNote

You can obtain the values for these properties from your SAP system administrator.

The *.dest property file should be named <SAP-GWHOST>.dest. For example, if the name of your SAP gateway is SAPSYS, the name of the file should be SAPSYS.dest.

Following is a sample configuration for the *.dest property file:

Code Block
jco.client.client=800
jco.client.user=wso2_user
jco.client.passwd=wso2pass14
jco.client.lang=en
jco.client.ashost=/H/217.116.29.154/S/3299/H/10.100.5.120/S/3200
jco.client.gwserv=3300
jco.client.sysnr=00
jco.client.idle_timeout=300
jco.client.logon=0
jco.client.msserv=3600
jco.client.trace=0
jco.client.getsso2=0
jco.client.r3name=CPT

Setting up the *.server property file

To setup WSO2 ESB as an IDoc server you need to create the *.server property file and define the relevant properties. The following table lists the properties and the description of each property that should be specified in the *.server property file.

PropertyDescription

jco.server.gwhost

Gateway host

jco.server.gwserv

Gateway service

jco.server.progid

Program ID of the server

jco.server.trace

You can enable or disable the RFC trace
jco.server.repository_destination Name of the .dest file. For example, if the .dest file is SAPSYS01.dest , set this to SAPSYS01 .
jco.server.params Arbitrary parameters for RFC library

jco.server.snc_myname

SNC name

jco.server.snc_qop

SNC level of security (1-9)

jco.server.snc_lib

Path to the SNC library

jco.server.profile_name

Name of the profile file used during start-up

jco.server.unicode

Determines whether or not you connect in unicode mode (1=true, 0=false)

jco.server.max_startup_delay

Maximum server start-up delay time in seconds
Info
titleNote

You can obtain the values for these properties from your SAP system administrator.

This file should be named <SAP-GWHOST>.server. For example, if the name of your SAP gateway is SAPSYS, the name of the file should be SAPSYS.server.

Following is a sample configuration for the *.server property file:

Code Block
jco.server.gwhost=/H/217.116.29.154/S/3299/H/10.100.5.120/S/3200
jco.server.gwserv=3300
jco.server.progid=IGS.CPT
jco.server.repository_destination=IGS.CPT
jco.server.name=IGS.CPT
jco.server.unicode=1

 

The table below summarises how you can define a SAP endpoint and a proxy service.

 Endpoint ConfigurationProxyService Configuration

BAPI/RFC adapter

Code Block
languagehtml/xml
<endpoint name="sapidocendpointsapbapiendpoint">

  <address
 uri="idocbapi:/JCOCLIENT01"/>
</endpoint>

The SAP endpoint client property file should be in <ESB_HOME>/repository/conf/sap/JCOCLIENT01.dest

Code Block
languagehtml/xml
<proxy name=”sapidocproxy””sapbapiproxy”  transports=”idoc””bapi”/>

//in,out,fault Sequence
  <parameter
 name="transport.sap.serverName">

    JCOSERVER01

  </parameter>
.serverName">JCOSERVER01</parameter>
// other parameters
</proxy>

SAP endpoint server property file should be in <ESB_HOME>/repository/conf/sap/JCOSERVER01.server

JCo parameters

...

proxy>

SAP endpoint server property file should be in <ESB_HOME>/repository/conf/sap

...

Server properties (*.server property file)

PropertyDescription

gwhost

Gateway host

gwserv

Gateway service

progid

Program ID of the server

trace

You can enable or disable the RFC trace
paramsArbitrary parameters for RFC library

snc_myname

SNC name

snc_qop

SNC level of security (1-9)

snc_lib

Path to the SNC library

profile_name

Name of the profile file used during start-up

unicode

Determines whether or not you connect in unicode

mode (1=true, 0=false)

max_startup_delay

Maximum server start-up delay time in seconds

Client properties (*.dest property file)

Enable or disable uppercase character conversions for logon
PropertyDescription

client

Client logon

user

User logon

alias_user

Alias user name

passwd

Logon password

lang

Logon language

sysnr

R/3 system number

ashost

R/3 application server

mshost

R/3 message server

gwhost

Gateway host

gwserv

Gateway service

r3name

R/3 name
groupGroup of application servers

tpname

Program ID of external server program
tphostHost of external server program

type

Type of remote host (3=R/3, E=External)
codepageInitial code page for logon

use_sapgui

Use remote SAP graphical user interface

mysapsso2

Use the specified SAP cookie version 2 as the logon ticket
grt_dataAdditional data for GUI

use_guihost

Host to which the remote GUI is redirected

use_guiserv

Service to which the remote GUI is redirected
use_guiprogidProgid of the server that starts the remote GUI
snc_partnername

SNC partner name (for example, CN=B20, O=SAP-AG, C=DE\) snc_mode

snc_mode

SNC mode (0 or 1)

snc_qop

SNC level of security (1-9)

snc_myname

SNC name; overrides default SNC partner
snc_libPath to the library

Dest

R/2 destination

saplogon_id

SAPLOGON string on 32-bit Windows

extiddata

Data for external application (PAS)

extidtype

Type of external authentication (PAS)

x509cert

Use the specified X509-certificate as the logon ticket

msserv

R/3 port number of message server

profile_name

Profile name used for shared memory communication

idle_timeout

Idle timeout for the connection

ice Ignore

RFC library character conversion errors (1 or 0)

logon

Enable or disable logon check at open time (1 or 0)

trace

Enable or disable RFC trace (1 or 0)

abap_debug

Enable ABAP debugging (1 or 0)

getsso2

Get or do not get a SSO ticket after logon (1 or 0)

toupper

/JCOS ERVER01.server

IDoc adapter
Code Block
languagehtml/xml
<endpoint name="sapidocendpoint">
   <address uri="idoc:/JCOCLIENT01"/>
</endpoint>

The SAP endpoint client property file should be in <ESB_HOME>/repository/conf/sap/JCOCLIENT01.dest

Code Block
languagehtml/xml
<proxy name=”sapidocproxy”transports=”idoc”/>
//in,out,fault Sequence
  <parameter name="transport.sap.serverName">JCOSERVER01</parameter>
// other parameters
</proxy>

SAP endpoint server property file should be in <ESB_HOME>/repository/conf/sap/JCOSERVER01.server

 

Following are descriptions of the proxy level listener parameters that can be defined in a proxy configuration:

ParameterDescription
transport.sap.serverName The name of the server containing the JCO server configuration.
transport.sap. enableErrorListener Set this to enable the default error listener. If this is used together with the transport.sap. customErrorListener parameter, the custom error listener will be used.
transport.sap. enableTIDHandler Set this to enable the transaction handler to handle transactions that are received from a SAP system. Transactional applications must provide a custom implementation using the transport.sap. customTIDHandler parameter.
transport.sap. customTIDHandler The fully qualified class name for the custom TID handler implementing JCoServerTIDHandler.
transport.sap.connections The number of registered connections managed by the server instance. The default value is 1 and the maximum value is 100.
transport.sap. customErrorListener The fully qualified class name for the custom error listener implementing  JCoServerErrorListener. 
transport.sap. customExceptionListener The fully qualified class name for the custom exception listener implementing  JCoServerExceptionListener.

 

Following are descriptions of the SAP client properties that can be defined in the message context with axis2-client scope:

PropertyDescription
transport.sap.xmlMapper The key of custom IDOC XML mapper to use. This key should be defined in the transport.sap. customXMLMappers parameter. If no key is specified the default IDoc XML mapper will be used. 
transport.sap. xmlParserOptions

The options for the default IDoc XML parser to be used in the default IDoc XML mapper. Multiple options can be combined using the bitwise OR "|" operator. The possible parser options are as follows:

PARSE_ACCEPT_ONLY_XMLVERSION_10 3328
PARSE_ACCEPT_ONLY_XMLVERSION_11 2816
PARSE_ACCEPT_ONLY_XMLVERSIONS_10_TO_11 2304
PARSE_IGNORE_INVALID_CHAR_ERRORS 4
PARSE_IGNORE_UNKNOWN_FIELDS 2
PARSE_REFUSE_UNKNOWN_XMLVERSION 256
PARSE_REFUSE_XMLVERSION_10 512
PARSE_REFUSE_XMLVERSION_11 1024
PARSE_WITH_FIELD_VALUE_CHECKING 1
PARSE_WITH_IGNORE_UNKNOWN_FIELDS 2
PARSE_WITHOUT_FIELD_DATATYPE_CHECKING 8


Following is an Axis2 transport sender property that can be defined in axis2.xml: 

transport.sap.customXMLMappers : The key/value list of custom mappers, where the values are fully qualified class names for custom mappers implementing org.wso2.carbon.transports.sap.idoc.IDocXMLMapper.

...

Troubleshooting

Given below are general troubleshooting guidesguidelines.

  • How to handle the Server unknown error

    An example of this error message is as follows:

    Code Block
    [2010-10-25 19:53:00,405] ERROR - DefaultErrorListener Exception occured on :
JCOSERVER01 and connection : null
com.sap.conn.jco.JCoException: (129) JCO_ERROR_SERVER_STARTUP: Server startup
failed at Mon Oct 25 19:53:00 IST 2010.
This is caused by either a) erroneous server settings, b) the backend system has been shutdown,
c) network problems. Will try next startup in 1 seconds.
Could not start server: Connect to SAP gateway failed
Connect parameters: TPNAME=JCOSERVER01 GWHOST=cynthia GWSERV=sapgw00
ERROR service 'sapgw00' unknown
TIME Mon Oct 25 19:53:00 2010
RELEASE 720
COMPONENT NI (network interface)
VERSION 40
RC -3
MODULE nixxsl.cpp
LINE 184
DETAIL NiSrvLGetServNo: service name cached as unknown
COUNTER 2
at com.sap.conn.jco.rt.DefaultServer.openConnection(DefaultServer.java:1168)
at com.sap.conn.jco.rt.DefaultServer.openConnections(DefaultServer.java:1057)
at com.sap.conn.jco.rt.DefaultServer.adjustConnectionCount(DefaultServer.java:1004)
at
com.sap.conn.jco.rt.DefaultServerManager$DispatcherWorker.run(DefaultServerManager.java:
299)
at java.lang.Thread.run(Thread.java:619)
Caused by: com.sap.conn.jco.JCoException: (129) JCO_ERROR_SERVER_STARTUP: Could
not start server: Connect to SAP gateway failed
Connect parameters: TPNAME=JCOSERVER01 GWHOST=cynthia GWSERV=sapgw00
ERROR service 'sapgw00' unknown
TIME Mon Oct 25 19:53:00 2010
RELEASE 720
COMPONENT NI (network interface)
VERSION 40
RC -3
MODULE nixxsl.cpp
LINE 184
DETAIL NiSrvLGetServNo: service name cached as unknown
COUNTER 2
at
com.sap.conn.jco.rt.MiddlewareJavaRfc$JavaRfcServer.accept(MiddlewareJavaRfc.java:2135)
at com.sap.conn.jco.rt.ServerConnection.accept(ServerConnection.java:380)
at com.sap.conn.jco.rt.DefaultServer.openConnection(DefaultServer.java:1149)
© 2012 WSO2
.. 4 more
Caused by: RfcException: [null]
message: Connect to SAP gateway failed
Connect parameters: TPNAME=JCOSERVER01 GWHOST=cynthia GWSERV=sapgw00
ERROR service 'sapgw00' unknown
TIME Mon Oct 25 19:53:00 2010
RELEASE 720
COMPONENT NI (network interface)
VERSION 40
RC -3
MODULE nixxsl.cpp
LINE 184
DETAIL NiSrvLGetServNo: service name cached as unknown
COUNTER 2
Return code: RFC_FAILURE(1)
error group: 102
key: RFC_ERROR_COMMUNICATION
at com.sap.conn.rfc.engine.RfcIoControl.error_end(RfcIoControl.java:255)
at com.sap.conn.rfc.engine.RfcIoControl.ab_rfcaccept(RfcIoControl.java:43)
at com.sap.conn.rfc.api.RfcApi.RfcAccept(RfcApi.java:41)
at
com.sap.conn.jco.rt.MiddlewareJavaRfc$JavaRfcServer.accept(MiddlewareJavaRfc.java:2121)
... 6 more

    The solution to overcome this is to add your SAP server names to the /etc/services file with

...

  • the relevant ports. For example, the following lines can be added

...

  • if we consider the example error given above.

    Code Block
    sapgw00 3300/tcp
sapgw01 3301/tcp
Excerpt
hiddentrue

Information about enterprise integration with SAP and WSO2 ESB.