56. Which mechanism can be used to pass data between a process instance and a called sub process other than mapping from/to the caller's input/output ?
Answer: This can be accomplished using job shared variables, unless in the call
process activity the 'Spawn' flag is enabled in which case the called sub process is a new
job and hence gets a fresh copy of the job shared variable initialized as per its
configuration. A shared variable can overcome this limitation as it's scope is not limited to one job.
57. What are the three scenarios where BW engine has to be configured with database persistence instead of Local File ?
Answer: The three scenarios are:
- Shared Variables across BW engines.
- Locking across groups in multiple BW engines.
- Wait Notify across BW engines.
58. If you want a group to be executed if there is some unhandled error but subject to some max number of iterations which group do you use ?
Answer: We can use Repeat on Error until true
59. When is a 'Generate Error' activity useful?
Answer: When you handle an error inside a
called subprocess or group and want to rethrow the error to the
caller(happens by default if you dont handle the error in the called
process)
60. Which activity is used for detecting duplicate message processing?
Answer: CheckPoint activity - Specify the uniqueID for the duplicate key field and
engine maintains
list of these key fields. When a process come to checkpoint activity with
the same value for
duplicate key which already exists, it throws a DuplicateException. An error
transition can
then handle this case.
61. Give an example where graceful migration of service from one machine to another is not possible.
Answer: HTTP Receiver. In this case the receiver on new machine starts listening on the same port,
but you need to redirect requests from the old machine to the new one.
62. What are the types of adapter services ?
Answer: Types of adapter services are :
- Subscriber Service
- Publisher Service
- Request-Response Service
- Request-Response Invocation Service
63. If the business process needs to invoke another web service which resource do you use ?
Answer: SOAP request reply activity. If the
business process needs to be exposed as SOAP service use SOAP Event
Source in conjunction with SOAP Send Reply or SOAP Send Fault.
64. What is the functionality of the Retrieve Resources resource?
Answer: It can be used to serve the wsdl file of a SOAP Event Source to a (http)
client.
Construct a process like:
Now the WSDL file for a SOAP service can be retreived using the http request
where 'path' is the folder path to the SOAP Event Source process and 'resourceName' is the name of the process
Example : http://purch:8877/Purchasing/GetPurchaseOrder?wsdl
Construct a process like:
HTTP Receiver -> Retrieve Resources -> Send HTTP ResponseNow the WSDL file for a SOAP service can be retreived using the http request
http://<host>:<port>/<path>/<resourceName>?wsdlwhere 'path' is the folder path to the SOAP Event Source process and 'resourceName' is the name of the process
Example : http://purch:8877/Purchasing/GetPurchaseOrder?wsdl
65. What is the scope of user defined process variables ?
Answer: The scope of user defined process variables is only the process in which it is defined.(Not even inside a sub process that
is invoked from this process)
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