{"id":178,"date":"2017-05-13T01:46:20","date_gmt":"2017-05-13T01:46:20","guid":{"rendered":"http:\/\/www.gologica.com\/blog\/?p=178"},"modified":"2025-04-06T02:33:52","modified_gmt":"2025-04-06T02:33:52","slug":"soa-bpel-mediator-osb-development-12c-interview-questions","status":"publish","type":"post","link":"https:\/\/www.gologica.com\/elearning\/soa-bpel-mediator-osb-development-12c-interview-questions\/","title":{"rendered":"SOA BPEL Mediator OSB Development 12c Interview Questions"},"content":{"rendered":"

What is Oracle Service Bus or OSB ?<\/strong><\/p>\n

The larger, powerful service bus<\/p>\n

Used for message brokering<\/p>\n

Message Transformation over XQuery & XSLT<\/p>\n

Extended functionality important for enterprise-wide integration like<\/p>\n

Message Throttling<\/p>\n

Service Pooling<\/p>\n

Reliable Messaging<\/p>\n

Development through Eclipse IDE or Service Bus Console<\/p>\n

OSB specific deployment<\/p>\n

What are the key features of Oracle Service Bus or OSB ?<\/strong><\/p>\n

Supports Multiprotocol Messaging<\/p>\n

Enables Location Transparency<\/p>\n

Handles Dynamic Routing<\/p>\n

Enables Message Transformation<\/p>\n

Enables Service Orchestration<\/p>\n

Supports Message Enrichment<\/p>\n

Provides Service Security<\/p>\n

Implements Service Level Agreement<\/p>\n

Explain in detail about key features of Oracle Service Bus or OSB ?<\/strong><\/p>\n

Dynamically transform and route services using simple and\/or complex routing rules and\/or message payloads<\/p>\n

Ability to orchestrate services from existing IT systems with disparate messaging protocols without needing to change the systems and styles<\/p>\n

Isolate service location changes<\/p>\n

Rapidly respond to business needs by quickly configuring routing rules based on changes to business rules or existing IT systems, without coding<\/p>\n

Orchestrate several services to create new one<\/p>\n

Supports message enrichment<\/p>\n

Enables optimized, pluggable, policy-driven transport and message level security<\/p>\n

Implements rules-driven, configurable Service Level Agreement (SLA)<\/p>\n\n\n\n
<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"SOA<\/a><\/p>\n

Describe OSB\u2019s role as a Message Broker ?<\/strong><\/p>\n

A message broker is an architectural pattern for message validation, message transformation and message routing<\/p>\n

It mediates communication amongst applications, minimizing the mutual awareness that applications should have of each other in order to be able to exchange messages, effectively implementing decoupling<\/p>\n

OSB Message broker:<\/p>\n

Decoupling (via interfaces)<\/p>\n

Routing: provides routing to the correct service instance according to technical or functional data to take into account the partitioning of the components business applications<\/p>\n

Message transformation and enrichment<\/p>\n

Service composition\/aggregation<\/p>\n

Light orchestration (stateless)<\/p>\n

Version management<\/p>\n

Protocol break<\/p>\n

Message validation<\/p>\n

Error handling<\/p>\n

Content Control<\/p>\n

Schema Validation<\/p>\n

What are some of the major protocols that OSB supports ?<\/strong><\/p>\n

HTTPS<\/p>\n

SOAP<\/p>\n

JMS<\/p>\n

SMTP\/POP\/IMAP<\/p>\n

Tuxedo<\/p>\n

EJB<\/p>\n

Native MQ<\/p>\n

File<\/p>\n

FTP<\/p>\n

STFP<\/p>\n

Email<\/p>\n

What is meant by Location Transparency ?<\/strong><\/p>\n

A service bus is used for endpoint virtualization<\/p>\n

In 11g stack, Oracle Service Bus (OSB) is the primary service bus<\/p>\n

So, we can expose proxy service at OSB t0 outside world and in exposed OSB proxy message flow, route incoming request to any business service on the basis of routing logic<\/p>\n

Note: alternatively, use Mediator in SOA 11g to expose service and use mediator routing logic to route to actual service<\/p>\n

OSB Location Transparency:<\/p>\n

OSB creates \u201cLocation Transparency\u201d through isolation of consumers from service providers and act as a proxy layer to transport the message<\/p>\n

OSB can be used to isolate service location changes<\/p>\n

What is Message Enrichment ?<\/strong><\/p>\n

Getting additional information from the existing service using Service Callout option<\/p>\n

And then adding\/inserting this additional information (required) into an incoming message\/request XML before it route to the service endpoint<\/p>\n

In OSB 11g, it is Business Service<\/p>\n

Sometimes, you may have legacy application coded in core Java or EJB, and then at times you may need Java Callout<\/p>\n

Where does the Service Bus fit in the SOA landscape ?<\/strong><\/p>\n

Significance of OSB in an SOA Landscape<\/p>\n

Oracle Service Bus is at the heart of Oracle\u2019s comprehensive business integration solution and belongs to the Oracle Messaging product line<\/p>\n

Oracle Service Bus is primarily targeted for managing different types of services, and providing traditional message brokering across heterogeneous IT environments<\/p>\n

The lightweight, stateless, high-performance architecture of Oracle Service Bus and its converged intelligent message mediation and service life cycle management capabilities, make it an ideal core component of distributed services networks<\/p>\n

It is designed to fit into the broader IT Service-Oriented Architecture (SOA) landscape as a distributed service management intermediary and can be integrated with other Oracle business process management solutions in distributed heterogeneous deployments<\/p>\n

How does a Service Bus facilitate a loosely coupled architecture ?<\/strong><\/p>\n

Described solely by its interface contract and behavioral attributes (i.e. hides its implementation and facilitates loose-coupling)<\/p>\n

Loose Coupling of Services:<\/p>\n

Loose coupling is achieved through abstracting and resolving the differences between two or more systems in order to facilitate a seamless integration<\/p>\n

An ESB\/OSB provides or helps to mediate the differences along the following lines:<\/p>\n

    \n
  1. Transport Protocol<\/li>\n
  2. Interaction Pattern (message exchange pattern)<\/li>\n
  3. Shape (Interface \/ Schema)<\/li>\n
  4. Security Paradigm<\/li>\n<\/ol>\n

    More definition for loose coupling of services:<\/p>\n

    Oracle Service Bus establish loose coupling between service clients and business services<\/p>\n

    OSB maintains the central point security and monitoring<\/p>\n

    Oracle Service bus is an intermediary that processes incoming service request messages, determines routing logic, and transforms these messages for compatibility with other service consumers<\/p>\n

    It receives messages through a transport protocol such as HTTP(S), JMS, File, and FTP, and sends messages through the same or a different transport protocol<\/p>\n

    SOA is a kind of architecture that uses services as building blocks to facilitate enterprise integration and component reuse through loose coupling<\/p>\n

    Explain OSB Service Orchestration ?<\/strong><\/p>\n

    Combining existing services to make new services<\/p>\n

    This is light orchestration as compared to the BPEL orchestration in SOA which may be Synchronous\/Asynchronous<\/p>\n

    But in OSB 11g, it is stateless<\/p>\n

    There are limitations with OSB 11g as compared to the BPEL\/SOA which could be used for maintaining states for hours\/days as per our business needs<\/p>\n

    What is a Proxy Service ?<\/strong><\/p>\n

    A proxy service is what the service bus exposes to service consumers and implements the virtualization logic<\/p>\n

    A proxy service can route messages to multiple business services; you can choose to configure a proxy service with an interface that is independent of the business services with which the proxy service communicates<\/p>\n

    In such cases, you can configure a proxy service message flow definition to route a message to the appropriate business service and map the message data into the format required by the business service interface<\/p>\n

    It is exposed to the calling applications or services<\/p>\n

    Proxy services are Oracle Service Bus definitions of intermediary Web services that Oracle Service Bus implements locally on Weblogic Server<\/p>\n

    You can think of proxy services as the services published by OSB<\/p>\n

    Instead of your service clients calling the services directory, they call OSB proxy services instead<\/p>\n

    Few more definitions of Proxy Service:<\/p>\n

    Proxy services are definitions of generic intermediary Web services that are hosted locally on Oracle Service Bus<\/p>\n

    A proxy service communicates with other services in the IT infrastructure through interfaces, which may or may not be identical to that of a service provider or service consumer business service<\/p>\n

    Proxy services can route messages to multiple business services, using their configured independent interfaces<\/p>\n

    Proxy services can be defined and configured using the Oracle Service Bus Console<\/p>\n

    They are configured by specifying their<\/p>\n

      \n
    1. interface<\/li>\n
    2. type of transport OSB uses<\/li>\n
    3. and their associated message processing logic<\/li>\n
    4. Q) What is Message Flows in OSB ?<\/li>\n<\/ol>\n

      Message flows are definitions used for implementing proxy services within Oracle Service Bus<\/p>\n

      Message flow modeling involves configuration of message processing logic in proxy service\u2019s message flow definitions<\/p>\n

      This logic includes activities such as transformation, publishing, reporting, and exception management<\/p>\n

      You can use the graphical modeling tools available in Workspace Studio\/OEPE and in the Oracle Service Bus Console to perform message modeling<\/p>\n

      Oracle Service Bus proxy service implementations are defined in message flow definitions using components such as<\/p>\n

        \n
      1. Pipelines<\/li>\n
      2. Branch nodes<\/li>\n
      3. Route nodes<\/li>\n<\/ol>\n

        Another explanation for Message Flow:<\/p>\n

        In Oracle Service Bus, a message flow is the implementation of a proxy service<\/p>\n

        You can configure logic for the manipulation of messages using proxy service message flow definitions<\/p>\n

        This logic includes such activities as transformation, publishing, and reporting, which are implemented as individual actions within the stages of a pipeline<\/p>\n

        Message flow in OSB is the most important part<\/p>\n

        It defines the request message flow from Start Node to Route activity and also defines the response message flow from Route to Start Node<\/p>\n

        It contains Pipeline Pairs, Branch Nodes, Route Nodes, Stages, and Actions etc<\/p>\n

        What is a Business Service ?<\/strong><\/p>\n

        Business services are Oracle Service Bus definitions of the enterprise services that exchange messages during business processes<\/p>\n

        A business service and its interface can be defined and configured using the Oracle Service Bus design-time tooling<\/p>\n

        To configure a business service, you must specify its interface, the type of transport it uses, its security requirements, and other characteristics<\/p>\n

        A business service definition is similar to that of a proxy service, but it does not have pipelines (a message flow)<\/p>\n

        It connects to the EIS (Enterprise Information System) layer (<\/p>\n

        In an enterprise architecture, EIS is typically a SOAP based Web Services<\/p>\n

        Can we expose any Business Service to external clients or subscribers ?<\/strong><\/p>\n

        No, we cannot expose Business Services to external clients or subscribers<\/p>\n

        We need Proxy Services to expose to external world<\/p>\n\n\n\n
        <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        \"SOA<\/a><\/p>\n

        Can we have Proxy Services without Business Services ?<\/strong><\/p>\n

        Yes we can have Proxy Services without Business Services, but that will be just a dummy service<\/p>\n

        EIS layer cannot be connected using that Proxy Service<\/p>\n

        Explain Service Callout in OSB ?<\/strong><\/p>\n

        Action is to be used in a Pipeline pair to call the services<\/p>\n

        It should be noted that the Service Callout action is used only for invoking synchronous request-response operations<\/p>\n

        OSB\u2019s service callout action offers greater flexibility for more sophisticated message flows<\/p>\n

        The service callout action is used inside a message flow to call on another service registered within OSB to perform necessary action on the message<\/p>\n

        The response returned by that service is assigned to a local variable<\/p>\n

        The variable can then be used within the current message flow<\/p>\n

        The service callout action can be used configure a synchronous (blocking) callout to an OSB-registered proxy or business service<\/p>\n

        The service types that can be called could be \u2013<\/p>\n

        WSDL Web Service<\/p>\n

        SOAP<\/p>\n

        Any XML Service<\/p>\n

        Messaging<\/p>\n

        Whether OSB Service Callout is Synchronous or Asynchronous ?<\/strong><\/p>\n

        Synchronous request-response used in pipeline-pair<\/p>\n

        And it is blocking<\/p>\n

        Explain Java Callout in OSB ?<\/strong><\/p>\n

        Sometime, you may have legacy application coded in core Java or EJB, and then at times you may need Java Callout<\/p>\n

        Invoking \/ accessing method should be \u201cpublic\u201d and \u201cstatic\u201d<\/p>\n

        What are the different types of Pipelines ?<\/strong><\/p>\n

        Request pipeline<\/p>\n

        Response Pipeline<\/p>\n

        What is a Pipeline Pair ?<\/strong><\/p>\n

        Pipeline pairs are request and response pipelines<\/p>\n

        The request pipeline definition specifies the actions that Oracle Service Bus performs on request messages to the proxy service before invoking a business service or another proxy service<\/p>\n

        The response pipeline definition specifies the processing that Oracle Service Bus performs on responses from the business or proxy service that the proxy service invokes before returning a response to a client<\/p>\n

        NOTE: A Pipeline Pair node can have only one direct descendant in the Message Flow<\/p>\n

        Stage: A stage is a container of related activities to manipulate messages passing through the pipeline<\/p>\n","protected":false},"excerpt":{"rendered":"

        What is Oracle Service Bus or OSB ? The larger, powerful service bus Used for message brokering Message Transformation over …<\/p>\n","protected":false},"author":1,"featured_media":2200,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"aside","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"pmpro_default_level":"","footnotes":""},"categories":[12],"tags":[],"coauthors":[182],"class_list":["post-178","post","type-post","status-publish","format-aside","has-post-thumbnail","hentry","category-oracle_intervew_questions","post_format-post-format-aside","pmpro-has-access","user-has-not-earned"],"yoast_head":"\nSOA BPEL Mediator OSB Development 12c Interview Questions - GoLogica<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.gologica.com\/elearning\/soa-bpel-mediator-osb-development-12c-interview-questions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SOA BPEL Mediator OSB Development 12c Interview Questions - GoLogica\" \/>\n<meta property=\"og:description\" content=\"What is Oracle Service Bus or OSB ? 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