Operational BPEL Interview Questions & Answers:
The control over the web services that are involved and coordinating the execution of different operations on the web services involved in the operation is taken by the central process in orchestration as per the requirements. The involved web services are unaware of this process. With operations that are explicitly defined and the order of invocation of the web services, the orchestration is centralized.
Choreography does not rely on a central coordinator. The web services involved in the choreography is aware exactly the execution of its operations and whom to interact with. Choreography is a collaborative effort. It focuses on messages exchange. The awareness of business process, operations to execute, messages to exchange, and the time of message exchange are needed for all participants of choreography.
3. Describe the BPMN standard for business process modeling and analysis?
The BPMN specifies a graphical notation for expressing business processes in a Business Process Diagram. Both technical users and business users are supported for business processes using BPMN. BPMN provides a standardized, simple means of process information communication to other business users, customers, suppliers and process implementers.
4. Define incorporating Java and Java EE Code in BPEL processes?
There are several methods for incorporating Java and Java EE code in BPEL processes:
★ Wrap as a Simple Object Access Protocol (SOAP) service
★ Use bpelx:exec built-in methods
★ Use Java code wrapped in a service interface
★ Embed Java code snippets into a BPEL process with the bpelx:exec tag
★ Use an XML facade to simplify DOM manipulation
5. What kind of different types of business processes BPEL supports?
BPEL supports two different types of business processes:
★ Executable processesallow us to specify the exact details of business processes. They can be executed by an orchestration engine. In most cases BPEL is used for executable processes.
★ Abstract business protocols allow us to specify the public message exchange between parties only. They do not include the internal details of process flows and are not executable.
★ Allows us to define abstract and executable processes
★ Is supported by the majority of companies
★ Software exists (from several vendors) on which such processes can be executed (BPEL servers) and developed (BPEL designers).
7. Do you know how to wrap Java Code as a SOAP service?
You can wrap the Java code as a SOAP service. This method requires that the Java application have a BPEL-compatible interface. A Java application wrapped as a SOAP service appears as any other web service, which can be used by many different kinds of applications. There are also tools available for writing SOAP wrappers.
BPMN specifies a graphical notation for expressing business processes in a Business Process Diagram. Both technical users and business users are supported for business processes using BPMN.
9. Describe Business Process Execution Language (BPEL)?
Business Process Execution Language is a language that is executable for interaction specification along with Web services. The processes of BPCL will export and import information by utilizing exclusively web service interfaces.
10. Explain the difference between BPEL Orchestration and BPEL Choreography?
Choreography:
Choreography does not rely on a central coordinator. The web services involved in the choreography is aware exactly the execution of its operations and whom to interact with. Choreography is a collaborative effort. It focuses on messages exchange. The awareness of business process, operations to execute, messages to exchange, and the time of message exchange are needed for all participants of choreography.
Orchestration:
The control over the web services that are involved and coordinating the execution of different operations on the web services involved in the operation is taken by the central process in orchestration as per the requirements. The involved web services are unaware of this process. With operations that are explicitly defined and the order of invocation of the web services, the orchestration is centralized.
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