SAP Integration

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 asorg.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 uses 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.

Installing WSO2 SAP Adapter

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

Download and install WSO2 ESB by following the instruction in Installation Guide.
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.
Note

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

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 jcolibrary `libsapjco3.so` to `<JDK_HOME>/jre/lib/i386/server`.
Linux 64-bit	Copy the Linux native SAP jcolibrary `libsapjco3.so` to `<JDK_HOME>/jre/lib/amd64`.
Windows	Copy the Windows native SAP jcolibrary `sapjco3.dll` to `<WINDOWS_HOME>/system32`.

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.
Copy the following SAP endpoint properties files to the <ESB_HOME>/repository/conf/sap directory. You need to have two properties 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 store SAP endpoint parameters when WSO2 ESB is configured as a client to an external SAP endpoint.
- *.server : This is where we store SAP endpoint parameters when WSO2 ESB is configured as a server to an external SAP endpoint.
For details on creating the properties files and defining the relevant properties, see Setting up the Client Configuration File and Setting up the Server Configuration File.
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/

Setting up the Client Configuration File

To setup WSO2 ESB as a client to a SAP system you need to create the *.dest properties 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 properties file.

Property	Description
`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

Note

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

The *.dest properties 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 properties file:

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 Configuration File

To setup WSO2 ESB as an IDoc server you need to create the *.server properties 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 properties file.

Property	Description
`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 unicodemode (1=true, 0=false)
`jco.server.max_startup_delay`	Maximum server start-up delay time in seconds
`jco.server.connection_count`	Number of SAP to ESB connections
`jco.server.name`	Name of the server configuration. This needs to be the same name provided in the SAP configuration.

Note

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 properties file:

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

Configuring WSO2 SAP Adapter

Go to the required tab for detailed steps based on how you need to configure WSO2 SAP Adapter.

Additional Configuration Parameter

This section describes additional parameters that can be used when configuring WSO2 SAP adapter.

SAP Transport Sender Parameters

Following are descriptions of the SAP client properties that can be defined in the message context with axis2-client scope when using WSO2 ESB as a SAP client to send messages. These properties can be added in <ESB_HOME>/repository/conf/axis2/axis-client.xml file:

Property Description

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 <ESB_HOME>/repository/conf/axis2.xml file:

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.

Proxy Service Listener Parameters

Following are descriptions of the proxy level listener parameters that can be defined in a proxy configuration when using WSO2 ESB as a SAP server:

Parameter	Description
`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`.

Troubleshooting

Given below are general troubleshooting guidelines.

How to handle the Server unknown error

An example of this error message is as follows:

[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.

sapgw00 3300/tcp
sapgw01 3301/tcp

How to handle connection to message server host failed error

An example of this error message is as follows:
```
Connection parameters: TYPE=B DEST=SAPSYS01 MSHOST=SAPSYS01 MSSERV=3600 R3NAME=ERD GROUP=PUBLIC PCS=1

ERROR Group PUBLIC not found

TIME Fri Jan 24 15:48:53 2014
```
This indicates that that the username (i.e. wso2-user) used in the above configuration is not assigned to the 'public' user group.
The solution to overcome this is to add wso2-user to the user group named public in your SAP system. If such a group does not exist, a user group named 'public' needs be created and the above user needs to be added to that group.