Most Frequently Asked Oracle BPEL Interview Questions and Answers
1. Question 1. What Is Bpel?
Answer :
Within the enterprise, BPEL is
used to standardize enterprise application integration as well as to extend the
integration to previously isolated systems. Between enterprises, BPEL enables
easier and more effective integration with business partners. BPEL stimulates
enterprises to further define their business processes, which in turn leads to
business process optimization, reengineering, and the selection of the most
appropriate processes, thus further optimizing the organization.
Definitions of business processes
described in BPEL do not affect existing systems, thereby stimulating upgrades.
BPEL is the key technology in environments where functionalities are already or
will be exposed via Web services. With increases in the use of Web services,
the importance of BPEL will increase as well.
BPEL represents a convergence
of two early workflow languages; Web Services Flow Language (WSFL) and XLANG.
WSFL was designed by IBM and is based on the concept of directed graphs. XLANG,
a block-structured language, was designed by Microsoft. BPEL combines both
approaches and provides a rich vocabulary for description of business
processes.
2. Question 2. What Is Oracle
Jdeveloper?
Answer :
Oracle BPEL Process Manager
provides support for using Oracle JDeveloper to graphically design BPEL
processes.
Oracle JDeveloper is an
integrated development environment (IDE) for building applications and Web
services using Java, XML, and SQL standards. Oracle JDeveloper supports the
entire development life cycle with integrated features for designing, coding,
debugging, testing, profiling, tuning, and deploying applications. A visual and
declarative development approach and the Oracle Application Development
Framework (ADF) work together to simplify application development and reduce coding
tasks.
Oracle JDeveloper uses BPEL as
its native format. This means that processes built with Oracle JDeveloper are
100% portable. Oracle JDeveloper also enables you to view and modify the BPEL
source without decreasing the usefulness of the tool.
You design BPEL processes by
dragging and dropping elements (known as activities) into the process and
editing their property pages. This eliminates the need to write BPEL code. You
integrate BPEL processes with external services (known as partner links). You
also integrate adapters and services such as workflows, transformations,
notifications, sensors, worklist task management, and business rules with the
process. Oracle JDeveloper can deploy the developed processes directly to
Oracle BPEL Server. This facilitates the development and maintenance of BPEL
processes.
Oracle BPEL Process Manager
provides support for the following services and adapters in Oracle JDeveloper:
o
Transformations,
workflows, worklists, notifications, sensors, and business rules
o
Technology
adapters (file, FTP, database, AQ, JMS, MQ, and Oracle Applications)
3. Question 3. What Are Two Ways
Of Combining Web Services?
Answer :
Web services can be combined
in two ways:
o
Orchestration
o
Choreography
4. Question 4. Explain
Orchestration And Choreography?
Answer :
In orchestration, which is
usually used in private business processes, a central process (which can be
another Web service) takes control of the involved Web services and coordinates
the execution of different operations on the Web services involved in the
operation. The involved Web services do not "know" (and do not need
to know) that they are involved in a composition process and that they are
taking part in a higher-level business process. Only the central coordinator of
the orchestration is aware of this goal, so the orchestration is centralized
with explicit definitions of operations and the order of invocation of Web
services.
Choreography, in contrast,
does not rely on a central coordinator. Rather, each Web service involved in the
choreography knows exactly when to execute its operations and with whom to
interact. Choreography is a collaborative effort focusing on the exchange of
messages in public business processes. All participants in the choreography
need to be aware of the business process, operations to execute, messages to
exchange, and the timing of message exchanges.
5. Question 5. What Are Two
Different Ways Of Describing Business Processes That Are Supported By Bpel?
Answer :
BPEL supports two different
ways of describing business processes that support orchestration and
choreography:
o
Executable
processes allow you to specify the exact details of business processes. They
follow the orchestration paradigm and can be executed by an orchestration
engine.
o
Abstract business
protocols allow specification of the public message exchange between parties
only. They do not include the internal details of process flows and are not
executable. They follow the choreography paradigm.
6. Question 6. List Of All
Primitive Activities Supported By Bpel Business Process?
Answer :
Primitive
activities represent basic constructs and are used for common tasks, such as
the following:
o
Invoking other Web
services.
o
Waiting for the
client to invoke the business process by sending a message.
o
Generating a
response for synchronous operations.
o
Manipulating data
variables.
o
Indicating faults
and exceptions.
o
Waiting for some
time.
o
Terminating the
entire process.
7. Question 7. What Is The Use Of
Bpel Business Process?
Answer :
In a typical scenario, the
BPEL business process receives a request. To fulfill it, the process invokes
the involved Web services and then responds to the original caller. Because the
BPEL process communicates with other Web services, it relies heavily on the
WSDL description of the Web services invoked by the composite Web service.
8. Question 8. What Are Two
Configuration Settings For Auditing?
Answer :
auditLevel:
o
off - absolutely
no logging performed whatsoever; may result in a slight performance boost for
processing instances.
o
minimal - all
events are logged; however, no audit details are logged.
o
production - all
events are logged. The audit details for assign activities are not logged; the
details for all other nodes are logged.
o
development - all
events are logged; all audit details for all activities are logged.
auditDetailThreshold:
The maximum size (in bytes) an
audit trail details string can be before it is stored separately from the audit
trail. If a details string is larger than the threshold it will not be
immediately loaded when the audit trail is initially retrieved; a link will be
displayed with the size of the details string. Typically, the details string
will contain the contents of a BPEL variable. In cases where the variable is
very large performance may be severely impacted by logging it to the audit
trail. The default value is 50 kilobytes.
9. Question 9. What Are Two Modes
Of Invocation That Are Supported By Bpel Console?
Answer :
BPEL Console supports two
modes of invocation: an HTML Form view and an XML Source mode.
The XML Source mode, shown
below, allows you to enter XML source data directly into a text form and that
source is passed, as is, to initiate the BPEL process. To simplify the use of
this mode, you can configure default XML data in the deployment descriptor of
the process, which will be pre-loaded into the XML data field .
Alternatively, the HTML Form
view in the BPEL Console's Initiate tab will automatically generate an HTML
input form (when possible), which can be used to provide the input values to
initiate a BPEL process for testing purposes.
10. Question 10. What Are Alerts
For Stuck Bpel Messages?
Answer :
An alert is displayed when
there are stuck messages for asynchronous BPEL processes. A global time
threshold is used identify stuck messages.
Alerts are
displayed at multiple levels:
o
soa-infra
o
Composite
o
Flow Trace (PS4)
11. Question 11. Explain
Bpelx:insertbefore Extension In An Assign Activity?
Answer :
The from-spec query within
bpelx:insertBefore yields zero or more nodes. The node list is appended as
child nodes to the target node specified by the to-spec query.
The to-spec query of the
insertBefore operation points to one or more single L-Value nodes. If more than
one node is returned, the first node is used as the reference node. The
reference node must be an element node. The parent of the reference node must
also be an element node. Otherwise, a bpel:selectionFailure fault is generated.
The node list generated by the from-spec query selection is inserted before the
reference node. The to-spec query cannot refer to a partner link.
The following
example shows the syntax before the execution of . The value of addrVar is:
CA
94065
After the execution of the following syntax in the BPEL process file:
Redwood Shore>
The value of addrVar now becomes:
Redwood Shore
CA
94065
94065
After the execution of the following syntax in the BPEL process file:
Redwood Shore>
The value of addrVar now becomes:
Redwood Shore
CA
94065
12. Question 12. What Are Two
Types Of Events Supported By Bpel?
Answer :
Although fault handlers and
scopes improve the robustness of BPEL processes considerably, you can also
manage events.
BPEL supports two
types of events:
o
Message events are
triggered by incoming messages through operation invocation on port types.
o
Alarm events are
time-related and are triggered either after a certain duration or at a specific
time.
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13. Question 13. How Many Tables
Are Used For Mediator Instance Tracking?
Answer :
There are in total
5 tables which are used by mediator instance tracking:
o
Mediator_instance - One row for each mediator message flow.
o
Mediator_case_instance - One row for each mediator case (~ routing rule).
o
If a mediator
component has two routing rules then this should have 2 records for that
mediator instance.
o
Mediator_case_detail - Captures mediator audit trail for each mediator routing rule.
Number of records may vary based on the nature of mediator component.
o
Eg: if mediator
component is having a async req-resp routing rule then this would contain 2
rows for the corresponding mediator routing rule.
o
Mediator_document - Stores the
payload for routing rules which are configured as deferred (~ parallel in
jdev). So if all the routing rules are "sequential" then this will
not contain any records.
o
Mediator_audit_document - Stores the payload for audit trail and only when
"instanceTrackingLevel" for mediator is "Complete".
14. Question 14. What Are Various
Sources Of Faults In Bpel?
Answer :
Business processes specified
in BPEL will interact with partner processes through operation invocations on
Web services. The communication between Web services is usually over internet
connections that are not highly reliable. Web services can also raise faults
due to logical and execution errors. Therefore, BPEL business processes need to
handle faults appropriately and may also need to signal faults themselves.
Faults in BPEL can
be from various sources:
o
A BPEL process can
explicitly signal (throw) a fault.
o
A fault can occur
when the BPEL process invokes a Web service operation. The operation might
return a WSDL fault message, which results in a BPEL fault.
o
A fault can be
thrown automatically by the BPEL runtime environment, either due to a certain
condition in the BPEL process itself (such as a join failure), as a consequence
of error conditions in the runtime environment, or related to network
communication or other reasons. For such situations, BPEL defines several
standard faults.
15. Question 15. How Can A
Business Process Signal A Fault Explicitly?
Answer :
A business process
sometimes needs to signal a fault explicitly. Therefore, BPEL provides the
activity, which has the following syntax:
BPEL does not require
definition of fault names prior to their use in the activity. This flexible
approach can be error-prone, because there is no compile-time checking of fault
names. In the case of typos, misspelled faults will not be handled by the
designated fault handler.
Faults can also have an
associated variable that contains fault data. If such a variable is required,
you have to specify it when throwing a fault, by using the optional
faultVariable
16. Question 16. How Can We Handle
Faults In Bpel?
Answer :
When a fault occurs within a
business process, the process may not complete successfully. (But it can
complete successfully if the fault is handled within a scope, which enables you
to divide a complex process into several parts; more on scopes later.) The
business process can handle the fault through one or more fault handlers.
Within a fault handler, the business process defines custom activities that
should recover from the fault and possibly reverse the partial (unsuccessful)
work of the activity where the fault has occurred.
The fault handlers are
specified before the first activity of the BPEL process, after partner links
and variables.
The overall
structure is shown in the following code excerpt:
Within the fault handlers, you
specify several activities where you indicate which fault you want to catch and
handle. Within a fault handler, you must specify at least one or . The activity
can be specified only once within a fault handler.
Usually you specify several
activities where you will handle specific faults and use to handle all other
faults. To specify which fault you would like to handle, you must specify at
least one of the following:
o
faultName, which
specifies the name of the fault to handle
o
faultVariable,
which specifies the variable type used for fault data
The flexibility of
activities is high, and all the following variations are permissible:
Fault handlers in BPEL are
similar to try/catch clauses in modern programming languages such as Java.
17. Question 17. What Is Scopes In
Bpel? How Can It Be Useful In Handling Faults?
Answer :
Scopes are hierarchically
organized parts into which a complex business process can be divided. They
provide behavioral contexts for activities. In other words, scopes enable you
to define different fault handlers for different activities (or sets of
activities gathered under a common structured activity such as or ). In
addition to defining fault handlers, you can declare variables that are visible
only within a scope. Scopes also let you define local correlation sets,
compensation handlers, and event handlers.
18. Question 18. What Is Inline
Fault Handling?
Answer :
In BPEL processes, invocation
of operations on Web services can be particularly error-prone. There are
numerous situations—such as broken connections, unavailability of Web services,
or changes in the Web services WSDL—that can prevent a BPEL process from successfully
invoking a partner Web service operation.
Such faults can be handled in
the section of the corresponding scope.
19. Question 19. Explain The Use
Of Message Event And Alarm Events?
Answer :
Managing message events is
particularly important when the business process is waiting for callbacks from
partner Web services. activity, lets you wait for only a single (exactly
specified) message on a port type. Often, however, it is more useful to wait for
more than one message, of which only one will occur.
Alarm events are useful when
you want the process to wait for a callback for a certain period of time, such
as 15 minutes. If no callback is received, the process flow continues as
designed. This approach is particularly useful in loosely coupled
service-oriented architectures, where you cannot rely on Web services being
available all the time. This way, the process flow can proceed even if one of
the bookstores does not return an offer.
20. Question 20. Explain Pick
Activity Of Bpel?
Answer :
BPEL provides the activity,
through which you can specify that the business process should await the
occurrence of one event in a set of events. Events can be message events
handled with the activity or alarm events handled with the activity. For each
event, you specify an activity or a set of activities that should be performed.
21. Question 21. How Can We Use
Pick As Initial Activity?
Answer :
You can use the activity
instead of the initial activity. You can specify several operations, and
receiving one of these messages will result in the creation of a business
process instance. Then you have to use a special form of the activity. You
specify the createInstance attribute for the activity, but you can specify only
events; events are not permitted in this specific form.
To understand the use of this
special form of the activity, consider the bookstore Web service, implemented
as a simple BPEL process.
22. Question 22. How Xml Data
Works In Bpel?
Answer :
In a BPEL process, every piece
of data is in XML forms. This includes the messages passed to and from the BPEL
process, the messages exchanged with external services, and local variables
used by the process. You define the types for these messages and variables with
the XML schema, usually in the WSDL file for the flow, the WSDL files for the
services it invokes, or the XSD file referenced by those WSDL files. Therefore,
all variables in BPEL are XML data, and any BPEL process uses much of its code
to manipulate these XML variables. This typically includes performing data
transformation between representations required for different services, and
local manipulation of data (for example, to combine the results from several
service invocations).
23. Question 23. What Is Use Of
Assign Activity In Bpel?
Answer :
You use the assign activity to
copy data from one XML variable to another, or to calculate the value of an
expression and store it in a variable. A copy element within the activity
specifies the source and target of the assignment (what to copy from and to),
which must be of compatible types.
The formal syntax
as shown in the Business Process Execution Language for Web Services
Specification is as follows:
standard-elements
+
from-spec
to-spec
+
from-spec
to-spec
This syntax is
described in detail in that specification. The from-spec and to-spec typically
specify a variable or variable part, as in:
Example of assigning a numeric
value to a variable in XPath expressions.
You can assign numeric values
in XPath expressions. The following example shows how to assign an XPath
expression with the integer value 100.
24. Question 24. How Can You
Assign Boolean Values To A Field In Xpath Expression ?
Answer :
In this example of assigning
Boolean values, the XPath expression in the from clause is a call to XPath's
Boolean function true, and the specified approved field is set to true. The
function false is also available.
The XPath specification
recommends that you use the "true()" and "false()"
functions as a method for returning Boolean constant values.
If you instead use
"boolean(true)" or "boolean(false)", the true or false
inside the Boolean function is interpreted as a relative element step, and not
as any true or false constant. This means it attempts to select a child node named
true under the current XPath context node. In most cases, the true node does
not exist. Therefore, an empty result node set is returned and the boolean()
function in XPath 1.0 converts an empty node set into a false result. This
result can be potentially confusing.
25. Question 25. How Can You
Assign The Current Value Of A Date Or Time Field By Using The Oracle Bpel Xpath
Function Getcurrentdate, Getcurrenttime, Or Getcurrentdatetime ?
Answer :
You can assign the current
value of a date or time field by using the Oracle BPEL XPath function
getCurrentDate, getCurrentTime, or getCurrentDateTime, respectively. In
addition, if you have a date-time value in the standard XSD format, you can
convert it to characters more suitable for output by calling the Oracle BPEL
XPath function formatDate.
In the next example, the
formatDate function converts the date-time value provided in XSD format to the
string 'Jun 10, 2005' (and assigns it to the string field formattedDate).
26. Question 26. Explain
Bpelx:rename And Xsd Type Casting?
Answer :
The bpelx:rename extension in
an assign activity enables a BPEL process to rename an element through use of
XSD type casting.
The syntax of bpelx:target is
similar to and a subset of to-spec for the copy operation. The target must
return a list of one more element nodes. Otherwise, a bpel:selectionFailure
fault is generated. The element nodes specified in the from-spec are renamed
the QName specified by the elementTo attribute. The xsi:type attribute is added
to those element nodes to cast those elements to the QName type specified by
the typeCastTo attribute.
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Assume you have
the following employee list:
JohnDole
JaneDole
PeterSmith
MarySmith
JaneDole
PeterSmith
MarySmith
Promotion changes
are now applied to Peter Smith in the employee list:
After executing the above
casting (renaming), the data looks as follows with xsi:type info added to Peter
Smith:
JohnDole
JaneDole
3000
marysmith
JaneDole
3000
marysmith
The employee data of Peter
Smith is now invalid, because and are missing. Therefore, is used to add that
information.
2500
petersmith
2500
petersmith
2500
27. Question 27. Explain
Bpelx:remove Extension In An Assign Activity?
Answer :
The bpelx: remove extension in an assign
activity enables a BPEL process to remove a variable.
Node removal specified by the
XPath expression is supported. Nodes specified by the XPath expression can be
multiple, but must be L-Values. Nodes being removed from this parent can be
text nodes, attribute nodes, and element nodes.
The XPath expression can
return one or more nodes. If the XPath expression returns zero nodes, then a
bpel:selectionFailure fault is generated.
The syntax of
bpelx: target is similar
to and a subset of to-spec for the copy operation.
The following
example shows addrVar with the following value:
500 Oracle
Parkway
Mailstop 1op6
CA
94065
Mailstop 1op6
CA
94065
After executing the following
syntax in the BPEL process file, the second address line of Mailstop is
removed.
28. Question 28. List Some Bpelx
Extension Types To Perform Various Operations On Xml Data In Assign Activities?
Answer :
You may want to perform various
operations on XML data in assign activities.
The following
bpelx extension types provide this functionality:
o
bpelx:append
o
bpelx:insertBefore
o
bpelx:insertAfter
o
bpelx:remove
o
bpelx:rename and
XSD Type Casting
o
bpelx:copyList
29. Question 29. What Are Two
Audit Trial Tables Used In Bpel?
Answer :
There are 2 audit
trail tables used in BPEL: audit_trail and audit_details.
All audit trail events are
inserted into audit_trail. audit_details is used for the details section of an
event (ie. payload); if a payload exceeds a certain size, it is inserted into
audit_details instead of being inlined in the audit_trail event.
30. Question 30. Bpel Is
Cross-platform, But Is There Any Advantage To Building The Underlying Services
On A J2ee Platform? If So, What Are They?
Answer :
The J2EE platform is maturing
towards better support for clustering, Virtualization and monitoring. By
architecture the BPEL Process Manager as a set of J2EE components, we will
transparently leverage those capabilities. Virtualization, automatic
deployment, on-demand scalability, and self-healing are notions that marry very
well with business processes so it will be very interesting to see those
developments come together.
31. Question 31. How Important Is
.net Compatibility? To What Extent Does Bpel Process Manager Support It?
Answer :
.NET is probably fourth or
fifth on the list of systems customers want to integrate with, so it is fairly
important. The BPEL Process Manager ships with examples showcasing how a BPEL
process can invoke a .NET service as well as how a .NET client can initiate a
BPEL process. We are looking at extending those samples to demonstrate security
and reliable messaging.
32. Question 32. What Version Of
The Bpel Standard Is Supported By Oracle Bpel Process Manager?
Answer :
BPEL PM 10.1.2 and 10.1.3
supports BPEL4WS 1.1. However, some features from WSBPEL 2.0 working draft have
already been implemented in the BPEL PM 10.1.2 and 10.1.3 releases. We plan for
full support for BPEL 2.0 shortly after it is released and expect a smooth
migration path.
33. Question 33. Bpel Process
Manager (as Well As Jdev, Adf, Toplink, Etc.) Run On Any J2ee Servers. Why Is
Oracle So Committed To Open Standards And Open Interfaces?
Answer :
Because they are good for
Oracle in that they allow us to leverage the hundreds of man-years invested in
building a scalable and reliable container. And they are good for our customers
in that they prevent them from being locked in.
34. Question 34. How Has/is Oracle
Been Involved With The Evolution And Standardization Of The Bpel Spec? How Does
This Relate To Oracle Other Integration And Web Service-related Standards
Efforts?
Answer :
Oracle is a very active member
of the OASIS BPEL committee. With more than 6,500 developers using the BPEL
Process Manager, we are at the forefront of the adoption of BPEL and can circle
back the feedback we are collecting to the committee. Oracle is also actively
involved of peripheral specifications: WS-reliability, WS-message delivery,
WS-context, WS-security, JSR-208/Java business integration. All these standards
are coming together to transform the internet into a messaging/integration
backbone. They will therefore play a very important role in the adoption of
BPEL.
35. Question 35. How Will Oracle
Business Integration Take Advantage Of Bpel And Bpel Process Manager Going
Forward?
Answer :
SOA, BPEL, and composite
applications bring us one step closer to "real-time enterprise." We
believe that rich business activity monitoring is the next step as it provides
details visibility into the execution of cross-functional processes and a
platform of business process optimization. You should expect to see a lot more
from Oracle on that aspect of the solution going forward.
36. Question 36. Why Is Native
Bpel Important? What Is The Disadvantage Of Products That Only Import/export
Bpel?
Answer :
Historically every time a
standard has been adopted (SQL, J2EE, LDAP, SMTP/POP/IMAP, HTML, etc.), native
solutions have won. It is because native solutions are less complex, faster and
offer richer functionality. It is also because re-architecting an engine around
a new abstraction is very difficult, especially if you have an existing install
base that you need to maintain and evolve in parallel.
37. Question 37. What Exactly Is
Oracle Bpel Process Manager? What Is It Composed Of? How Does It Relate To The
Rest Of The Stack?
Answer :
The Oracle BPEL Process
Manager is a new addition to the Oracle product portfolio. It enables
enterprises to model, deploy and manage BPEL processes. It comprises an
easy-to-use BPEL modeler, a scalable BPEL engine, an extensible WSDL binding
framework, a monitoring console and a set of built-in integration services
(transformation, user task, java embedding). It makes BPEL/Web service
orchestration a first class citizen of the Java platform.
38. Question 38. What Is
Orchestration? What Does It Mean To Build Composite Applications? Why Would
Anyone Want To?
Answer :
Existing systems are not going
away. Yet enterprises need to build new applications that can leverage the
functionality encapsulated in those existing systems. The notion of a composite
application is based around the idea of building new applications by wiring
together existing building blocks. Orchestration plays an important role in
this picture because it is the glue that coordinates the execution of each
discrete service. A good orchestration server needs to be reliable, scalable
and render the BPEL process logic with very high fidelity.
39. Question 39. What Is/was The
Motivation Behind Bpel? How Does It Differ From Other/past
Attempts/technologies Aimed At The Integration/business Process Problem? Can
You Talk Briefly About The Evolution Of Bpel?
Answer :
Orchestrating a set of
services into an end-to-end process flow entails a new set of technical
requirements (binding to heterogeneous system, synchronous and asynchronous
message exchange patterns, data manipulation, flow coordination, exception
management, undeterministic events, compensating transactions, side-by-side
versioning, in-flight instance management and auditing). The goal of BPEL is
provide a richer and yet simpler abstraction/standard for addressing those
requirements. Although it is a fairly new standard, it leverages from 10+ years
of research and development Microsoft and IBM invested in XLANG and WSFL.
40. Question 40. What Is Bpel? How
Does It Relate To Web Services And Service-oriented Architecture (soa)?
Answer :
There is a constant pressure
for businesses to interconnect their applications. This is what is driving the
adoption of web services and SOA as an enterprise blue print for reducing the
cost and complexity of integration initiatives. Making web services work is a
two-step process: first you publish and then you orchestrate. Publish means
taking a part of a existing system and exposing it as a service. Orchestrate
means composing multiple discrete services into an end-to-end process flow.
BPEL is the industry standard for orchestration.
41. Question 41. What Is Bpel
Process In Soa ?
Answer :
(Business Process Execution
Language) BPEL Process is a language used for the composition, orchestration
and coordination of webservics. In this post we will explain BPEL, define the
BPEL role with regard to Service Oriented Architecture and explain the
process-oriented approach to SOA and the role of BPEL.
In BPEL the Enterprise
application and information systems have become more more fundamental assets to
companies. The Companies are trust on them to be able to perform business
operations.
Enterprise Information system
can improve the efficiency of businesses through the automation of business
processes. The objective of almost every company is that the application it
uses should provide comprehensive support for business processes. It means that
applications should align with business processes closely.
BPEL Role of business
processes and their challenges,BPEL Business and IT alignment,What are BPEL
features,what are BPEL features, BPEL Orchestration and Choreography, Examine
the relation of BPEL to other Languages, The future of BPEL.
Already existing applications
have often been developed using older technologies, languages and
architectures, which are by definition less flexible to change. Such C,C++, and
Mainframe. These applications are tightly coupled applications, constructed of
interrelated modules, these are can not be differentiated, upgraded, or
refactored with reasonable amount of effort, place important limitations on the
flexibility of such applications.
Already existing applications
are also difficult to modify and adapt because they have not been developed in
a flexible way that would allow modifying application parts quickly and
efficiently. Modifying existing applications are require more time Complexity
of existing applications and the overall IT Architecture, Modifying them is a
complex, difficult and time-consuming task.
42. Question 42. What Are
Predefined Errors In Bpel?
Answer :
o
Custom errors
o
Timed out errors
o
BPM errors
o
Validation Errors
43. Question 43. How Can You
Increase Performance In Bpel?
Answer :
We can increase the
performance by writing indexes and sequences. (Or) Go to application
server - Configurations - Change Xml file
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