Handling BAPI errors using the Adapter Framework

Bridging between SAP and other systems using the adapter framework; part 3

So, this is yet another blog post about executing BAPI functions in SAP using the Adapter Framework; one day I will get bored with writing about SAP, but right now, it’s on the top of the heap. Today’s post is around error handling and reporting; any monkey can make something work, but handling error conditions gracefully is often a stumbling block that can trip you up during integration.

Handling Errors

Often the technical execution of the BAPI function will succeed but there may have been some business error during the execution (e.g. the data couldn’t be found); this is reported in the standard RETURN parameter from the BAPI which either exists as an EXPORT parameter or as part of the TABLE parameter list. BapiProducer allows you to configure an instance of BapiReturnParser which is able to interrogate this parameter and produce behaviour based on the values stored in the the structure.

The simplest implementation is FailOnError which does exactly what it suggests; in the event of an error (the TYPE field is ‘A’ or ‘E’) it throws an exception triggering standard error handling. There are other implementations, if you just wanted to mark that the BAPI function had failed, then you could use AddFailureMetadata which simply makes an item of metadata true in the event of failure.

If the BAPI function execution is part of a request/reply workflow (e.g. you’re looking up someone’s address from SAP); then you can always map the RETURN parameter explicitly into your XML document, and parse it when processing the reply.

Reporting on Exceptions

Errors could happen during the processing of the message; it’s all well and good capturing the RETURN parameter in your XML document, but what if a ServiceException is raised prior to the execution, or the execution failed technically in some fashion (perhaps you got a parameter wrong). This is where BapiExceptionReport comes in, which allows you to map exceptions into a standard RETURN element; you would use this as part of a ProcessingExceptionHandler chain.

As always, examples are worth a thousand words.

<message-error-handler xsi:type="java:com.adaptris.core.StandardProcessingExceptionHandler">
  <processing-exception-service xsi:type="java:com.adaptris.core.ServiceList">
    <service xsi:type="java:com.adaptris.core.services.exception.ExceptionReportService">
      <exception-generator xsi:type="java:com.adaptris.core.sap.jco3.rfc.bapi.exception.BapiExceptionReport">
        <default-exception-mapping>
          <id>ADAPTER_EXCEPTION</id>
          <number>000</number>
          <type>A</type>
        </default-exception-mapping>
        <exception-mapping>
          <exception-class>com.adaptris.core.sap.jco3.rfc.params.ParameterException</exception-class>
          <id>PARAM_EXCEPTION</id>
          <number>000</number>
          <type>A</type>
        </exception-mapping>
        <exception-mapping>
          <exception-class>com.sap.conn.jco.JCoRuntimeException</exception-class>
          <id>JCO_EXCEPTION</id>
          <number>000</number>
          <type>A</type>
        </exception-mapping>
      </exception-generator>
      <document-merge xsi:type="java:com.adaptris.util.text.xml.InsertNode">
        <xpath-to-parent-node>//OUTPUT</xpath-to-parent-node>
      </document-merge>
    </service>
    <service xsi:type="java:com.adaptris.core.StandaloneProducer">
      <producer xsi:type="java:com.adaptris.core.jms.PtpProducer">
        <destination xsi:type="java:com.adaptris.core.jms.JmsReplyToDestination"/>
      </producer>
      ... Connection config skipped.
    </service>
  </processing-exception-service>
</message-error-handler>

So if the exception that is raised is a JCoRuntimeException then the following block of XML will be inserted under the //OUTPUT node. The default-exception-mapping is what is used when an explicit match for an exception can’t be found, so in the case of a ServiceException it would generate a RETURN element with an ID of ADAPTER_EXCEPTION.

<RETURN>
  <TYPE>A</TYPE>
  <ID>JCO_EXCEPTION</ID>
  <NUMBER>000</NUMBER>
  <MESSAGE>'The value of e.getMessage()'</MESSAGE>
  <LOG_NO/>
  <LOG_MSG_NO/>
  <MESSAGE_V1/>
  <MESSAGE_V2/>
  <MESSAGE_V3/>
  <MESSAGE_V4/>
  <PARAMETER/>
  <ROW>0</ROW>
  <SYSTEM/>
</RETURN>

Remember that the error handling chain can be configured at a number of levels, adapter wide, channel wide, or on an individual workflow basis; you can compose complicated behaviour in a very simple way.



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