Hello Guys
Today I am sharing my blog on Oracle SOA & OSB_Interview
Questions
1) What is the difference between SOA Suite 10g and 11g?
SCA architecture was followed in 11g and not in 10g
In 11g you can put all your project SOA components in
composite.xml file and deploy to single server, where in 10g you have to deploy
each component to the respective server (i.e ESB to ESB server, BPEL to BPEL
Server)
Basically all the SOA components like BPEL, ESB (Called
Mediator in 11g), & OWSM are brought into one place in 11g using SCA
composite concept.
· The major difference between 10g & 11g would be the
app server container. 10g by default runs onOC4J while 11g runs on Web logic
Server.
· In 10g every BPEL is a separate project, but in 11g
several components can make 1 project as SCA.
· In 10g consoles are separate for BPEL and ESB, but in 11g
Enterprise Manager contains all.
· In 10g we have to deploy each project separately, but in
11g we can deploy SCA which contains all.
· In 10g BAM and business rules are outside SOA Suite, but
in 11g they are in SOA Suite.
2) What is SOA?
Service Oriented Architecture (SOA) is used to develop
Enterprise applications by using a collection of services which communicates
each other. Service-Oriented Architecture (SOA) is a set of principles and
methodologies for designing and developing software in the form of
interoperable services.
3) Principles
of SOA?
· loose
coupling
· Re-usability
·
Interoperability
· Flexible
4) Is
Oracle SOA same as Oracle Fusion Middleware?
No because SOA is one of the part in Fusion
middleware and
SOA behaves like user interface where as Fusion is big
platform
5) What
is SCA?
Service Component Architecture (SCA) provides
a programming model for building applications and systems based on a Service
Oriented Architecture. SCA is a model that aims to encompass a wide range of
technologies for service components and for the access methods which are used
to connect them.
6) What
is Web service?
Web services are application components, which are
self-contained and self-describing and provide services based on the open
protocol communication (i.e SOAP UI, HTTP over the net).
A Web service is a method
of communication between two electronic devices over the web. A Web
service is a software function provided at a network address over the web
or the cloud, it is a service that is “always on” as in the concept of utility
computing.
7) What is Mediator?
The Mediator is in charge of interconnecting, within an SOA
composite application, components that expose different interfaces. In
addition, the Mediator can perform duties such as filtering and making routing
decisions.
The composite editor in JDeveloper gives you the flexibility
to define the interface now, to choose an existing interface, or to define the
interface later as you wire components to the Mediator.
Transforming data from one representation to another is,
along with routing, one of the key functions of the Mediator.
8) Difference between ESB
and Mediator?
In 10g for routing, separate router need to keep along with
ESB for routing and filter expressions.
Where as in 11g mediator contains routing rules and filter
expressions itself.
9. How can you generate File Based
Events using Oracle Service Bus?
Service Bus allows you to create Proxy Services that can
poll to ftp and sftp servers . Create a Messaging Type Proxy Service and choose
, ftp or sft as the protocol on transport configuration.
10. How can you invoke an EJB method
from Oracle Service Bus?
EJBs can be invoked as Web Services by first registering a
Business Service with ejb transport and then getting the WSDL from the Business
Service.
Basic OSB/SOA Suite 11g Interview Question with Answers:
11. How can you achieve
parallel processing in Oracle Service Bus?
Oracle Service bus has the Split Join capability. A request
can be broken to multiple childs each of which can be processed parallel and
the results can be joined and then sent to requester.
12. What is difference between
a WSDL Proxy Service and Any SOAP Proxy service?
Any SOAP proxy service can accept any payload that conforms
to SOAP schema.
13. Can you interact directly
with Database from Service Bus?
Yes by using the BEA XQuery method execute-sql
14. How can you interact
transaction ally with multiple EIS such as JMS EJB and DB in Service Bus?
Invoke the Business Services and xqueries(for DB)
representing the different EIS in the request pipeline
15. For a Proxy Service
listening to a JMS Queue how can you ensure that the JMS Message is retried if
an error occurs during processing?
Use an XA JMS Connection factory in the jms url.
16. What purpose do the Stage
components serve in Service Bus?
They are the containers for actions. A stage is the smallest
group to have its error handling
17. How can you jump control
from one stage to next stage without using if then else logic?
Use the Skip action
18. How can you end a Proxy
flow without using if then else logic ?
By using the Reply action
19. Describe the different
sections of WSDL document?
WSDL different sections are
Type,message,porttype,binding,service.
20. Difference between RPC and
Document styles?
In RPC there is predefine standard for soap
message but in Doc there is no restriction for the soap message It allows you
to include whatever XML data you want and also to include a schema for this XML
21. What’s the main difference
from the WSDL perspective between synchronous and asynchronous services?
§ Synchronous WSDL has one
portType but asynchronous WSDL has two portType
§ Sync operation has
input,output,fault but asynchronous operation has only input
22. What’s correlation and why
is it needed?
§ Corroelation is the property
to map the request with the response
§ In async call it is required
to map the request with response.
23. What is SMO?
In mediation Service message
object(SMO) is used for processing and manipulating messages exchanged between
services. It is the extended version of SDO. SMO represnts the following group
of data
§ Header Information:
§ Body Of Message
§ Message Attachments
§ Context Information
24. In BPEL 11g, how the fault
handling is taken care of? What are those 2 xml files that will be used in this
fault handling?
§ There is new concept to
handling the fault in BPEL 11g by using two XML file
§ File names are
fault-binding.xml and fault-polises.xml
25.What is a Proxy Service?
You can think of proxy services as the services published by
OSB. Instead of your service clients calling the services directory, they call
OSB proxy services instead.
26.What are the different types of
Pipelines?
Request and Response Pipeline.
27.
What is a Publish Table?
Use a publish table action to publish a message
to Zero or more statically specified services.
28. What is a Publish Node?
Use a publish action to identify a statically specified
target service for a message and to configure how the message is packaged and
sent to that service.
29.Where does the Service Bus fit in
the SOA landscape?
The core of SOA success depends on
an Enterprise Service Bus (ESB) that supports dynamic synergy and alignment of
business process interactions, continual evolution of existing services and
rapid addition of new ones. To realize the benefits of SOA, it is imperative
that IT organizations include a robust and intelligent service intermediary
that provides a layer of abstraction to mask the complexities of service
integration in heterogeneous IT environments,
30.How does OSB support REST?
By defining your proxy service as an Any XML Service so you
can accept
and return XML of any flavor.
31.What are some of the major
protocols that OSB supports?
http,jms,ftp,sftp,jca,tuxedo(Oracle
Service Bus (OSB) use Tuxedo Transport so your applications can utilize
Tuxedo services from Java EE applications via OSB proxy and business services.)
32.what is Dynamic Routing?
Dynamic Routing is used to determine the business service at
runtime in the message flow.
33.In the context of OSB, what is a
Pipeline?
Pipeline pairs are request and
response pipelines. The request pipeline definition specifies
the actions that Oracle Service Bus performs on request messages, The
response pipelinedefinition specifies the actions that Oracle Service
Bus performs on response messages
34. What is Message Enrichment?
Adding or deleting some element from the message is called
message enrichment.
35. What is meant by “Location
Transparency”?
Through a registration and discovery mechanism, the SOA
provides location transparency, which allows clients to not know (or care)
about where a component or service is actually located.
36. What is dehydration storage tables?
Dehydration store is the database where BPEL engine stores
all BPEL processes meta data and run time instance data. This data store is
installed under db schema- ORABPEL
Meta data includes bpel process descriptor (bpel.xml), human
task modelling data etc..
Run time instance data includes process instance records,
process activities execution data, invoke and call back xml messages etc.
37. How to make partner link
Dynamically?
Just go inside the property tab when
you double click on the Invoke activity, inside the property of Invoke there
are different properties(jca.file.Directory and jca.file.FileName) which you
can set. Just click on the Values text space in front of the property it will
take you to Adapter Property screen where you can browse the value
forthisproperty.
38. What is synchronous file
read ?
Sync Read option in BPEL file adapter allows us to read the
file from the middle of the process, this is different from the Read option
which polls for the new files and is the start of the BPEL process.
39. What is transient and
durable BPEL?
Transient process: These are the
kind that does not have any break activity or mid receive activity in their
design. Dehydration process occurs at the end of the process. If the BPEL
process crashes before finishing, then the instance is lost. We will not find
the traces of this process in the dehydration store. To java folks, this is
very much similar to a transient variable. When explicitly declared as
transient the variable will not be persisted with the object state and cannot
be serialized.
Durable process: BPEL processes of this kind are dehydrated
on the fly when a breakpoint or non-idempotent activity is encountered. In the
event of a server crash, the BPEL process restarts from the last dehydration
point.
40. What is CAVS?
Composite Application Validation System (CAVS) is part of the Application Integration Architecture
Foundation Pack and with CAVS you can test your SOA Composites like SOAPUI or
the SOA Test Suite
41. What are MCF properties?
When configuring a Database Adapter
or AQ Adapter via the Adapter Configuration Wizard, a Database Connection is
required to configure the adapter (this is already defined in your project).
The Connection Information listed is actually pulled from your JDeveloper
Database Connection information.
Once the adapter is created, a WSDL file is automatically
created that includes the adapter definition. This includes the Managed
Connection Factory (MCF) properties as well as the Java Naming and Directory
Interface (JNDI) name, as shown below:
42. What is a
syncFileRead operation?Is is a inbound or a outbound operation?Can my process
begin with a syncFileRead operation?—
No since it is a outbound operation so you need to invoke
it.
43. What
is canonical model?
Canonical Model is a design
pattern used to communicate between different data formats. A form of
Enterprise Application Integration, it is intended to reduce costs and
standardize on agreed data definitions associated with integrating business
systems. A Canonical Model is any model that is canonical in nature, i.e.
a model which is in the simplest form possible based on a standard, common view
within a given context
Canonical Model is a design pattern, applied within
the service oriented design paradigm, which aims to reduce the need for performing
data model transformation when services exchange messages that
reference the same data model.
44. Difference
between ESB/Mediator and OSB?
ALSB (Aqua Logic Service Bus)
is renamed as OSB. The ‘old’ ESB has been renamed tomediator and
is now only used as component in our sca application.
Mediator is an internal
component installed as part of the SCA Composite editor within JDeveloper.
Mediator has essentially taken place of the role of ESB in 11g and takes care
of the communication brokering within an application. Mediator is geared at
being used to broker messages between components that compliment each other and
form a composite. Thus adhering to SCA (Service Component Architecture).
Mediator also offers functionality such as
§ Cross Referencing (XREF) –
Referencing of keys and fields from separate systems, by means of storing a
mapping table.
§ Domain Value Maps (DVM) –
Essential DVM is used to map information from one domain to another, this helps
significantly when utilizing Canonical Data Models.
§ Schema Validation – The
ability to make assertions of data types in a XML Tree.
OSB is a fully fledged
standalone stateless ESB, and works as an intermediary between service
consumers. It does this by primarily working as a proxy or a differentiated
layer between the two.
What does the Mediator do?
§ It mediates
components/services within an SOA Composite Application.
§ Routes the requests to the
Services
§ Data Transformation between
formats and protocols
§ It DOES NOT do service
localisation and it cannot act as a Gateway to the Services.
How is it different from Oracle Service Bus?
§ The main difference is in
the scope. Mediator performs intra-composite mediation while
Oracle Service Bus performs inter-composite mediation which means
that it mediates different composites together.
Mediator is an internal component in
a composite application and can be used to mediate between the components or
the component and the outside world. OSB is a standalone full function powerful
stateless ESB that is an intermediary between hetrogenous clients and services
and is a part of neither of them.
45. Comparison of
Oracle Mediator with Oracle Service Bus ?
Oracle Mediator is an
intra-composite mediation component that is deployed within a composite,
keeping the composite on a canonical model. Its primary function is to provide
the transformation of legacy formats to a common format. It is responsible for
brokering communications between components that make up a composite, enabling
transformation, routing, event delivery, and payload validation inside the
composite
46. Difference Between Service
Coreography and Service Orchestration?
Web services choreography pertains
to the public protocol of a Web service, describing the nature and order of
messages exchanged between a Web service and its consumers or peers.
Choreography has been proposed as a layer to fill the gap among existing
orchestration technologies. WSCI (Web Services Choreography Interface), was
proposed by BEA and Sun as a specification aimed at describing the flow of
messages among interacting Web services.
Web services orchestration, on the
other hand, pertains to the private implementation of a Web service, i.e.
describing and executing the interactions and flow among Web services to form
collaborative processes or (long-running) business transactions. The most
recent orchestration specification, BPEL4WS, was brought forward jointly by IBM
and Microsoft, consolidating earlier efforts by the respective vendors.
47.What are the fault handling mechanism in SOA?
Fault Handling in a BPEL Process:
There are two categories of BPEL faults:
§ Business faults
§ Runtime faults
Business Faults:
Business faults are
application-specific faults that are generated when there is a problem with the
information being processed (for example, when a social security number is not
found in the database). A business fault occurs when an application executes
a throwactivity or when an invoke activity receives a fault as a
response. The fault name of a business fault is specified by the BPEL process
service component. The messageType, if applicable, is defined in the WSDL. A
business fault can be caught with a faultHandler using the faultName and a
faultVariable.
<catch faultName=”ns1:faultName”
faultVariable=”varName”>
Runtime Faults:
Runtime faults are the result of
problems within the running of the BPEL process service component or web
service (for example, data cannot be copied properly because the variable name
is incorrect). These faults are not user-defined, and are thrown by the system.
They are generated if the process tries to use a value incorrectly, a logic
error occurs (such as an endless loop), a Simple Object Access Protocol (SOAP)
fault occurs in a SOAP call, an exception is thrown by the server, and so on.
These faults are included in thehttp://schemas.oracle.com/bpel/extension namespace.
These faults are associated with the messageType RuntimeFaultMessage.
Some Runtime Faults:
Binding Fault: A binding Fault
is thrown inside an activity if the preparation of the invocation
Fails. For example, the WSDL of the process fails to load. A
binding Fault is not retryable. This type of fault usually must be fixed by
human intervention.
RemoteFault: A remoteFault is
also thrown inside an activity. It is thrown because the invocation fails. For
example, a SOAP fault is returned by the remote service.
ReplayFault: A replayFault replays
the activity inside a scope. At any point inside a scope, this fault is
migrated up to the scope. The server then re-executes the scope from the
beginning.
48. What is WSDL and Basic structure of WSDL?
WSDL is an XML-based language for describing Web services
and how to access them. WSDL is a document written in XML. The document
describes a Web service. It specifies the location of the service and the
operations (or methods) the service exposes.
§ WSDL stands for Web Services
Description Language
§ WSDL is an XML based
protocol for information exchange in decentralized and distributed
environments.
§ WSDL is the standard format
for describing a web service.
§ WSDL definition describes
how to access a web service and what operations it will perform.
§ WSDL is a language for
describing how to interface with XML-based services.
§ WSDL is an integral part of
UDDI, an XML-based worldwide business registry.
§ WSDL is the language that
UDDI uses.
§ WSDL was developed jointly
by Microsoft and IBM.
§ WSDL is pronounced as
‘wiz-dull’ and spelled out as ‘W-S-D-L’
Following are the elements of WSDL document:
§ Definition: element
must be the root element of all WSDL documents. It defines the name of the web
service, declares multiple namespaces used throughout the remainder of the
document, and contains all the service elements described here.
§ Data types: the data
types – in the form of XML schemas or possibly some other mechanism – to be
used in the messages
§ Message: an abstract
definition of the data, in the form of a message presented either as an entire
document or as arguments to be mapped to a method invocation.
§ Operation: the abstract
definition of the operation for a message, such as naming a method, message queue,
or business process, that will accept and process the message
§ Port type : an abstract
set of operations mapped to one or more end points, defining the collection of
operations for a binding; the collection of operations, because it is abstract,
can be mapped to multiple transports through various bindings.
§ Binding: the concrete
protocol and data formats for the operations and messages defined for a
particular port type.
§ Port: a combination of
a binding and a network address, providing the target address of the service
communication.
§ Service: a collection
of related end points encompassing the service definitions in the file the
services map the binding to the port and include any extensibility definitions.
49.What is Split Join and Types of
Split Join?
Oracle Service Bus’s Split-Join
feature lets you split a service payload, such as an order, into individual
messages for concurrent processing. Concurrent processing, as opposed to
sequential processing, greatly improves service performance. Split-Join
achieves this task by splitting an input message payload into sub messages
(split), routing them concurrently to their destinations, and aggregating the
responses into one overall return message (join). This process of payload
splitting and response aggregation is called a Split-Join pattern.
Types:
a.) Static Split-Join
The static Split-Join branches from
the main execution thread of an Oracle Service Bus message flow by splitting a
payload into a fixed number of new branches according to the configuration of
the Split-Join. At design time you determine the number and variety of services
to be invoked.
b.) Dynamic Split-Join
The dynamic Split-Join branches from
the main execution thread of an Oracle Service Bus message flow by dynamically
creating new branches according to the contents of the incoming payload. The
dynamic Split-Join uses conditional logic to determine the number of branches
to create. All requests are handled simultaneously, and the responses are
aggregated into a single reply.
50. Types of Transactions in SOA?
§ Inbound transaction: A
transaction initiated by an inbound adapter. For example, a transaction
entering the SOA system from a JMS system.
§ Outbound transaction: A
transaction outbound from the SOA system (and hence from an adapter). For
example, a transaction that is made against a database outside the SOA system.
§ JTA transaction: Every step
of a process is executed within the context of a JTA transaction. A JTA
transaction ensures that one or more operations execute as an atomic unit of
work. See the section on XA above.
§ Asynchronous transaction: A composite transaction composed of
sub-transactions. However, these sub-transactions are consecutive and
serialized, that is, some sub-transactions may have been committed while others
may be still executing or have not yet executed. Asynchronous transactions are
guaranteed to be propagated once and only once. When an update at the source is
committed, the transaction commits and expects that the update is propagated to
the target appropriately.
§ Synchronous transaction:
These are transactions that execute in one thread from one endpoint to another,
without intermediate processes, and which are not serialized.
51. What is Compensate Activity?
The compensate activity
invokes compensation on an inner scope activity that has already successfully
completed. This activity can be invoked only from within a fault handler or
another compensation handler. Compensation occurs when a process cannot
complete several operations after already completing others. The process must
return and undo the previously completed operations. For example, assume a
process is designed to book a rental car, a hotel, and a flight. The process
books the car and the hotel, but is unable to book a flight for the correct
day. In this case, the process performs compensation by unbooking the car and
the hotel.The compensation handler is invoked with the compensate activity,
which names the scope on which the compensation handler is to be invoked.
52. What is TargetNamespace?
The targetNamespace is a
convention of XML Schema that enables the WSDL document to refer to itself.
53. What is attributeFormDefault?
The form for attributes declared in
the target namespace of this schema. The value must be “qualified” or
“unqualified”. Default is “unqualified”. “unqualified” indicates that
attributes from the target namespace are not required to be qualified with the
namespace prefix. “qualified” indicates that attributes from the target
namespace must be qualified with the namespace prefix.
54. What is elementFormDefault?
The form for elements declared in
the target namespace of this schema. The value must be “qualified” or “unqualified”.
Default is “unqualified”. “unqualified” indicates that elements from the target
namespace are not required to be qualified with the namespace prefix.
“qualified” indicates that elements from the target namespace must be qualified
with the namespace prefix.
55.what is difference between Abstract wsdl & concrete
wsdl?
Abstract wsdl:-Used on server side,contains request,response
and type of operation performed.
concrete wsdl:-used on client side,contains abstract wsdl and transport used.
Abstract WSDL contains only messages and operations.
Abstract WSDL is used by web Server where as concrete WSDL contains messages,
operations and binding/transport specific information i.e. SOAP over
Http/HTTPS/JMS having wsdl style i.e. RPC/DOC literal.
Abstract WSDL consists of the structure of the message that
is like what operation, what is the input and what is the ouput . Whereas in
concrete WSDL has all the things that the abstract wsdl has in addition it has
transport(http,jms) details.
Abstract wsdl:- Used on server side,contains
request,response and type of operation performed.
concrete wsdl:- Used on client side,contains abstract wsdl and transport used.
● An abstract WSDL document
describes what the web service does, but not how it does it or how to contact
it. An abstract WSDL document defines:
the operations provided by the web service.
the input, output and fault messages used by each operation to communicate with
the web service, and their format.
● A concrete WSDL document adds the information about how the web service
communicates and where you can reach it. A concrete WSDL document contains the
abstract WSDL definitions, and also defines:
the communication protocols and data encodings used by the web service.
the port address that must be used to contact the web service.
56.Basic Principles of Sequential Routing Rules?
Oracle Mediator processes sequential routing rules:-
§ ·
Oracle Mediator evaluates routings and performs the resulting actions sequentially.
Sequential routings are evaluated in the same thread and transaction as the
caller.
§ · Oracle
Mediator always enlists itself into the global transaction propagated through
the thread that is processing the incoming message. For example, if an inbound
JCA adapter invokes an Oracle Mediator, the Oracle Mediator enlists itself with
the transaction that the JCA adapter has initiated.
§ ·
Oracle Mediator propagates the transaction through the same thread as the
target components while executing the sequential routing rules.
§ ·
Oracle Mediator never commits or rolls back transactions propagated by external
entities.
§ · Oracle
Mediator manages the transaction only if the thread-invoking Oracle Mediator
does not already have an active transaction. For example, if Oracle Mediator is
invoked from inbound SOAP services, Oracle Mediator starts a transaction and
commits or rolls back the transaction depending on success and failure.
Basic Principles of Parallel Routing Rules
§ ·
Oracle Mediator processes routing rules in parallel based on the following
principles:
§ ·
Oracle Mediator queues and evaluates routings in parallel in different threads.
§ · The
messages of each Oracle Mediator service component are retrieved in a weighted,
round-robin fashion to ensure that all Oracle Mediator service components
receive parallel processing cycles. This is true even if one or more Oracle
Mediator service components produce a higher number of messages compared to
other components. The weight used is the message priority set when designing an
Oracle Mediator service component. Higher numbers of parallel processing cycles
are allocated to the components that have higher message priority.
§ ·
You can set the Priority field in the Mediator Editor to indicate the
priority of an Oracle Mediator service component. Priorities can range from
zero to nine, with nine being the highest priority. The default priority is
four.
57. Difference between Include and Import?
The difference between the include element and
the import element is that
import element allows references to schema components
from schema documents with different target namespaces and
the include element adds the schema
components from other schema documents that have the same target namespace (or
no specified target namespace) to the containing schema.
In short, the import element allows you to use
schema components from any schema; the include element allows you to
add all the components of an included schema to the containing schema.
Oracle Service Bus Interview
Question and Answers
Question: To connect to source
system which service we will use?
Answer: we will use Proxy service to connect to Source system.
Question: To connect to target system which service we will use?
Answer: we will use Business service
to connect to target system.
Question: What is Proxy
Service?
Answer: It is a service in OSB which
is exposed to source system or application.
Question: What is Business Service?
Answer: It is a service in OSB which
is used to connect to target system.
Question: What is Message Flow?
Answer: Message flow is there in
proxy service, We do all types of transformation, routing and other processing
message flow only.
Question: Do we have global variable in OSB (Can we access variable which is
defined in proxy service message flow from other proxy service message flow)?
Answer: No,
we can't access variable in proxy service message flow from other
proxy service message flow.
Question: Can we use direct bindings to call SOA composites?
Answer: Yes, we can direct
binding-bindings to call SOA composites along with SOAP bindings.
Question: Where the file will go if there is any error while polling the file ?
Answer: During configuring file or
ftp protocol in OSB, we need to specify error directory, so you can see file to
that directory if file polling failed.
Question: Why we use Split-Joins in OSB?
Answer: To do parallel processing.
Question: Types of Split-Joins?
Answer: Static and dynamic.
Question: How to call Java code from OSB?
Answer: By using Java callout
activity.
Question: Can we use more than one
route node in message flow?
Answer: No, we can't we use more than one route node in proxy service
message flow.
Question: When we call asynchronous
service from OSB then how to get response back from that asynchronous service
to OSB?
Answer: Design the proxy service
which in turn calls business service which in turn calls asynchronous service.
In the message flow of this proxy change the message header to below.
You need to specify ReplyTo value so
that asynchronous service response came to CallSyncCompositeProxy proxy
service.
<soap-env:Header
xmlns:ns1="http://schemas.xmlsoap.org/ws/2003/03/addressing">
<ns1:MessageID>ws:uniqueAddress</ns1:MessageID>
<ns1:ReplyTo>
<ns1:Address>http://localhost:8011/CallAsyncService/proxyServices/CallSyncCompositeProxy</ns1:Address>
</ns1:ReplyTo>
</soap-env:Header>
Remember ReplyTo address refers to
CallSyncCompositeProxy endpoints.
Question: What is
throttling in OSB?
Answer: Throttling means we want to
process certain messages in one time, then we need to set some parameters in
OSB to do the required task.
Question: to transform from binary
to XML or XML to binary format what we will in OSB?
Answer: we use MFL.
Question: can we use MDS in OSB?
Answer: No, Oracle Service Bus does
not support MDS.
Question: Can we use DVM’s in Oracle
Service Bus?
Answer: No, we can’t use DVM’s in
Oracle Service Bus.
Question: How Security works in OSB?
Answer: Oracle Service Bus leverages
Weblogic Security Framework.
Question: Can we use OWSM to secure
OSB services?
Answer: Yes, we can use OWSM to
secure OSB services.
Question: To secure OSB proxy
service, which OWSM policy you will use?
Answer: To secure OSB proxy service,
we use OWSM service side policy.
Question: Can we invoke secure web
service from OSB?
Answer: Yes, we can use OWSM client
policy and invoke secure web service from OSB.
Question: When we use service
Account?
Answer: We use Service Account when
we are invoking a service which required static authentication.
Question: Can we re-use Service
Account for other Business Services as well?
Answer: Yes, we can re-use the
Service Account.
Question: What is
Transport-Level Security?
Answer: It refers to transport
protocol security means secure the connection over which messages are
transferred. E.g. HTTPS means HTTP over SSL.
Question: What is Message-Level
security?
Answer: Message level security
is used when we want to protect the message exchanged between two applications.
Question: What is Service pooling in
OSB?
Answer: In OSB we can group
together more than one service so that whenever one service goes down, request
will route to next available service and end user can continue his work without
any interruption.
For more details, you can refer my
below post.
Question: How file pooling works in
OSB?
Answer: There are below two ways to
poll a file in OSB.
· Use
OSB file protocol: We can use file protocol available in proxy service to poll
the file. Refer below post for more details.
· Use
File adapter: we can create file adapter in Jdeveloper and import JCA, WSDL
& XSD file of that adapter into OSB and generate proxy service from that.
Question: Types of pipeline
available in OSB?
Answer: We have two pipelines in
OSB, Request and Response pipeline.
Question: Can we invoke Restful
service from OSB?
Answer: Yes, we can invoke Restful
service from OSB. For more details refer below post.
Question: When we use service
Account?
Answer: We use Service Account when
we are invoking a service which required static authentication.
Question: We don’t have any DB
protocol in OSB then how to read/write data from database using OSB?
Answer: We can use database adapter
to read/write data from database. We can create database adapter in Jdeveloper,
import adapter JCA,WSDL & XSD files to OSB and generate proxy or business
service as per our requirement.
Question: How to perform file
listing in OSB?
Answer: To perform file
listing in OSB, you need to create file adapter with file listing operation in
Jdeveloper and use that only.
Question: What is Service Result
caching in OSB?
Answer: Service Result Caching
is one of the options that you can use when you want to improve Oracle Service
Bus performance. Service Result caching is used when we have business service
which connects to external service which returns somewhat static response. So
by using Service Result Caching we don’t hit external service for same request
instead it will take the response from cache which improve the OSB performance
For more details, you can refer my
below post.
Question: How to perform Service
Callout in OSB?
Answer: We use Service Callout
option inside Oracle Service Bus to call any service inside message flow to get
the required data. In this post, I will show you how to use Service Callout
activity in Oracle Service Bus and pass the response from callout service to
next service
Refer below post for more details.
Question: When we invoke proxy 2
from proxy 1 then which protocol we need use?
Answer: When there is internal proxy
call in OSB then we use “local” transport instead of HTTP.
Question: What is content based
routing in OSB?
Answer: When we route the request
message to different business services based on request message content, that
is called content based routing.
Question: What are different options
available in OSB to read flat file?
Answer: We can read flat file in two
different ways.
· Using
MFL: we can MFL in OSB to read flat files. For more details refer my below post
· File
Adapter: Create file adapter which read flat file in Jdeveloper, copy JCA, WSDL
& XSD file of file adapter in OSB and create proxy service which will read
that flat file.
Question: What is SLA alert in OSB?
Answer: A service-level
agreement (SLA) is a contract between a service provider and a service
consumer. In OSB monitoring framework we have SLA alerts which come into
picture when there is violation of service level agreements.
Question: How to move large
file without reading it in OSB?
Answer: In Oracle SOA Suite we
use “Move” opeartion to move large files from one location to another. But in
Oracle Service Bus we don’t have that option available. But we can use Content
Streaming option avaiable for file protocol in OSB to move large files.
Cheers Guys!!!
Kavindra Sahu
