OAF Interview Questions (for Oracle Application Framework)

8/13/2019 OAF Interview Questions (for Oracle Application Framework)

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AF( racle Application Framework)

Interview Questions

1)What is an EO? a. Map to a database table or other data source

b. Each entity object instance represents a single row

c. Contains attributes representing database columns

d. Fundamental BC4J object through which all insertsupdatesdeletes interact with the database

e. Central point !or business logic and "alidation related to a table

!. Encapsulates attribute#le"el and entity#le"el "alidation logic

g. Can contain custom business methods

2. What is a VO?

a. $epresent a %uery result

b. &re used !or joining' !iltering' projecting' and sorting your business data

c. Can be based on any number o! entity objects

d. Can also be constructed !rom a (* statement

3. What are the methods in controller?

+rocess$e%uest'+rocess!orm,ata and process!ormre%uest

+rocess$e%uest - is called when the page is re%uested !or the !irst time !rom the ser"er.

+rocessForm$e%uest - is called when some e"ent occurs on the page +rocess!orm,atanot "isible). - /sed to capture ,ata !rom the !orm !ields which the user has entered

and post it into Model *ayer.

4. What is a Controller?

Controller is the ja"a !ile and can be associated to a complete 0&F page or to a speci!ic region.

here are se"eral tas2s you will do routinely in your code.

3andle button press and other e"ents

&utomatic %ueries

,ynamic 3E$E clauses

Commits

J(+ Forwards

he logic !or accomplishing all these tas2s is written in controller

5. When is the processRequest method called?

+$ method is called when the page is getting rendered onto the screen

6. When is processFormRequest method called?

+F$ method is called when we per!orm some action on the screen li2e clic2 o! submit button or clic2on lo"

http://chintuoracleappstechnicalstuff.blogspot.com/2013/07/oaforacle-application-framework.html






. What is e!tension?

E5tension is when you ta2e an already e5isting component e5 an 0&F page or a region and then add

some more !unctionality to it without disturbing the original !unctionality.

". What is personali#ation?

0racle &pps Framewor2 has an 0& +ersonali6ation Framewor2 associated with it so that you can

personali6e any 0&F page in an 0racle E#business (uite application without changing the basic or

underlying code o! that 0& Framewor2 page' 0racle &pplication Framewor2 ma2es it "ery easy to

personali6e the appearance o! the page or e"en the personali6ation o! data displayed on to an 0&

Framewor2 page.

$. What are le%els o& personali#ation?

1. Function *e"el

7. *ocali6ation *e"el

8. (ite *e"el

4. 0rgani6ation *e"el

9. $esponsibility *e"el

:. &dmin#(eeded /ser *e"el

;. +ortlet *e"el

<. /ser *e"el

'() What is *C4+?

Business Components !or Ja"a is J,e"eloper=s programming !ramewor2 !or building multitier

database applications !rom reusable business components. hese applications typically consist o!-

> & client#side user inter!ace written in Ja"a andor 3M*.

> 0ne or more business logic tier components that pro"ide business logic and "iews o! business

objects.

> ables on the database ser"er that store the underlying data.

'')What are all the components o& *C4+?

Following are the components o! BC4J-

> Entit, O-ect # E0 encapsulates the business logic and rules. E0?s are used !or @nserting' /pdating

and ,eleting data !rom the database table. EA is also used !or "alidating the records across the

applications.

> Vie/ O-ect # iew object encapsulates the database %uery. @t is used !or selecting data. @t

pro"ides iteration o"er a %uery result set. 0?s are primarily based on E0?s. @t can be used on multiple

E0?s i! the /@ is !or update.

> 0pplication 1odule # &pplication Modules ser"e as containers !or related BC4J components. he

pages are related by participating in the same tas2. @t also de!ines the logical data model and business

methods needed.



12) What is an EO?

E0 encapsulates the business logic and rules.E0?s are used !or @nserting' /pdating and ,eleting data.

his is used !or "alidating across the applications. e can also lin2 to other E0?s and create a

&ssociation object.

13) What is an VO? iew object encapsulates the database %uery. @t is used !or selecting data. @t pro"ides iteration o"er a

%uery result set.0?s are primarily based on Eo?s. @t can be used on multiple E0?s i! the /@ is !or update.

@t pro"ides a single point o! contact !or getting and setting entity object "alues. @t can be lin2ed together

to !orm iew *in2s.

'4) What is an 0O?

&n association object is created where we lin2 E0?s. For e5ample ta2e the search page where we lin2

the same E0 to !orm a association between the manager and employee. E"ery employee should ha"e a

manager associated. But i! it +resident then no there is no manager associated. his is a per!ect

e5ample to understand the &0.

'5) What is an V?

& "iew lin2 is an acti"e lin2 between "iew lin2s. & "iew lin2 can be created by pro"iding the source

and destination "iews and source and destination attributes. here are two modes o! iew lin2 operation

that can be per!ormed. & document and Master,etail operation.

'6). What is ?

/@ is an e5tensible' J7EE#based !ramewor2 !or building web applications. @t is based on the Model#

iew#Controller MC) design pattern' which pro"ides the !oundation !or building scalable enterpriseweb applications.

'). Where the VO is located in the 1VC architecture?

0 is located in the iew *ayer in MC which is responsible !or presenting the data to the user.

'") Which paca7e should include EO and 0O.

he E0 and &0 will be present in the schema.ser"er pac2age.

'$) What is the di&&erence -et/een inline lo% and e!ternal lo%.

@nline lo" is a lo" which is used only !or that particular page !or which it was created and cannot be

used by any other page.

E5ternal lo" is a common lo" which can be used by any page. @t is a common component !or any

page to use it. @t can be used by gi"ing the !ull path o! the lo" in the properties section DE5ternal *0

o! the item.

2() /hat is a +a%a-ean?

Ja"aBeans is an object#oriented programming inter!ace that lets you build re#useable applications or

program building bloc2s called components that can be deployed in a networ2 on any major operatingsystem plat!orm.

2') What is quer, *ean?



ueryBean is used to e5ecute and return the results o! a %uery on behal! o! the uery+ortlet

application.

22) /hat is the di&&erence -et/een autocustomi#ation criteria and result -ased search?

$esults based search generates search items automatically based on the columns on the results table.

@n &utocustomi6ation search we need to set what all !ields are re%uired to display as a search criteria.

23) /hat is 189?

M,( is Meta,ata (er"ice. hen a web page is bro2en into small units li2e buttons'!ields etc they are

stored in a database. hese are not stored as binary !iles but as data in tables. he data are present in

J,$ tables. M,( pro"ides ser"ice to store return page de!initions. M,( collects those de!initions in

components!ields in a meaning!ul manner to build a page.

24) What is 1?

M* is a mar2up language !or documents containing structured in!ormation.

(tructured in!ormation contains both content words' pictures' etc.) and some indication o! what role

that content plays !or e5ample' content in a section heading has a di!!erent meaning !rom content in a

!ootnote' which means something di!!erent than content in a !igure caption or content in a database

table' etc.).

25) What is the di&&erence -et/een customi#ation and e!tension?

Customi6ation is under direct user control. he user e5plicitly selects between certain options. /sing

customi6ation a user can-

&ltering the !unctionality o! an application

&ltering e5isting /@

&ltering e5isting business logic

E5tension is about e5tending the !unctionality o! an application beyond what can be done through

personali6ation. /sing e5tension we can-

&dd new !unctional !lows

E5tend or o"erride e5isting business logic

Create Gew applicationmodule

Create Gew page

Create Gew attribute

E5tend0"erride de!aults "alidations

26) What is :ersonali#ation?

+ersonali6ation enables you to declarati"ely tailor the /@ loo2#and#!eel' layout or "isibility o! page

content to suit a business need or a user pre!erence. /sing +ersonali6ation we can-

> ailor the order in which table columns are displayed.

> ailor a %uery result.

> ailor the color scheme o! the /@.

> Folder Forms > ,o Forms +ersonali6ation

2)Can ,ou e!tend e%er, possi-le 0pplication 1odule?



&nswer- Go..$oot &M cannot be e5tended.

2") What is root01?

he application module which is associated with the top#le"el page region the page*ayout region) is

root application module.

2$) Wh, can;t Root 01 -e e!tended?

he root &M is loaded !irst and a!ter that the M,( (ubstitutions are parsed.

3ence $00 &M gets loaded e"en be!ore the time the substitutions de!inition !rom M,( layer get

wor2ed out.

0b"iously' the root am cant substitute itsel!' hence it can=t be e5tended

3()What are the %arious pro&ile options in O0F?

FG, ,iagnostics- re%uired !or &B0/ 3@( +&HE and ,iagnostic lin2 on page.

+ersonali6e (el! (er"ice ,e!initions- o enable +ersonali6e page lin2 on the page.

FG, +ersonali6ation $egion *in2 Enabled- used to enable $egion +ersonali6ation lin2s at e"ery region.

FG, Migrate to J$&,- By de!ault set to Ies. +age would run !rom M,( i! Ies' else it will run !rom &.

FG, ,ocument root path- re%uired !or personali6ation migration. @t is set to path o! the M,( !older on

the respecti"e ser"ers.

FG, Branding image-

FG, Banding (i6e- these pro!iles options are used !or changing standard image 0racle) on the page.

3')9teps &or VO su-stitution?

1. &bout this +age#K 0' &M' E0' +ath o! +age

7. E5port Commad in cmd +rompt)

8. Gew .jpr L0pen page

4. *oo2 !or &M and 0 or E0.

9. Copy the class !iles o! 0'&M or E0

:. ,ecompile into Ja"a and store it into My+rojects with respecti"e directory structure)

;. 0pen 0.5ml in a new jpr

<. Create a new BC4J based on your 0riginal 0.

. Create a new 0 and e5tends original 0

1A. Change the %uery

11. $ebuild the project

17. Ho to .jp5double clic2)

18. Ho to (ubstitutions

14. (ubstitute o

19. $ebuild your +roject .jpr

1:. rans!er Gew 0 class and 5ml to respecti"e directory structure1;. F+ .jp5 into NJ&& O0+

1<. uni5 command promrt C,N J&&O0+

1. jp5 importer command



7A. Bounce &pache (er"er

32)What are di&&erent methods &or passin7 paramaters?

1. o2ens

eg. "nameLPQ&ttributeGameR

7. 3ash Maps

eg. 3ashMap "ariablenameLnre 3ashMap)S

"ariablename.addD+arameterGame'+arameteralue)S

8.hrough(ession

eg. pageConte5t.put(ession"alueD+aramterGame'+arameteralue)

33) setFor/ardR list

here are many parameters' here is the complete list o! it-#

public "oid setForward/$*(tring !unctionGame'

byte menuConte5t&ction'

(tring menuGame'

com.sun.ja"a.util.collections.3ashMap parameters'

boolean retain&M'

(tring addBreadCrumb'byte messaging*e"el)

+arameters-

!unctionGame # his is the !unction name representing the page you want to !orward to. @! its null' an

@llegal&rgumentE5ception will be thrown.

&lso i! the !unction is not under the current 30ME+&HE a 0&E5ception will be thrown.

menuConte5t&ction # ,etermines the beha"ior o! the MenuConte5t a!ter !orwarding to the new page. @t

accepts the !ollowing "alues-

0&ebBeanConstants.EE+OMEG/OC0GE- eeps the menu conte5t as is.

0&ebBeanConstants.EE+OG0O,@(+*&IOMEG/OC0GE- eeps the menu conte5t as is' but will not

display all menus including global buttons.

0&ebBeanConstants.EE+OG0O,@(+*&IOMEG/OC0GEO$E&@GOH*0B&*OB/0G(- eeps the

menu conte5t as is' but will not display all menus e5cluding global buttons.

0&ebBeanConstants.$EM0EOMEG/OC0GE- $emo"es the menu conte5t

0&ebBeanConstants.H/E((OMEG/OC0GE- (elects the gi"en !unctionGame !unction i! it e5ists in

the current menu.@! not it will try to ma2e a guess by mo"ing up the menu tree until it !inds it. &n e5ception will be

thrown i! the !unction could not be located.

0&ebBeanConstants.$E(EOMEG/OC0GE- $eset the menu conte5t to the gi"en !unctionGame and



menuGame.

menuGame # he name o! the 30ME+&HE menu to reset the Menu conte5t to when the

menuConte5t&ction is 0&ebBeanConstants.$E(EOMEG/OC0GE.

@! the menuGame is not o! type 30ME+&HE a 0&E5ception will be thrown. Iou can pass null otherwise.

parameters #

3ashMap o! parameter name"alue pairs to append to the !orward /$*. he !inal !orward /$*

parameters are in the !ollowing se%uence-

@t will !irst get the !unction=s corresponding /$* call by %uerying the !unction in!ormation !rom the

database. @! the user is not authori6ed to e5ecute this !unction' a security 0&E5ception will be thrown.

@t will then append all parameters passed in the parameters 3ashMap. First parameter added to the

3ashMap will be !irst added to the /$*. &lso the !ramewor2 will encode all parameter "alues be!ore

appending them to the /$*.

@t will remo"e all parameters i! they ha"e null "alues in the passed parameters 3ashMap. his pro"ides

an easy way !or de"elopers to set a certain parameter=s "alue to null i! they want to remo"e it.

@t will remo"e any 0& Framewor2 internal /$* parameters such as bcrumb' retain&M' and so on..

retain&M # @! true' all the cached application modules will be retained. @! !alse' all the cached application

modules will be released.

,e"elopers must use this parameter to control the release beha"ior o! the cached appplication modules.

his method will ignore any retain&MLtrue or retain&ML!alse as a /$* parameter or as part o!

parameters

34)Code to cop, ro/s in VO

public "oid copy)

P

(uppliers0@mpl per"o L get(uppliers01)S

$ow rowTU L per"o.getFiltered$owsV(electFlagV'VIV)S

!or int iLASiWrow.lengthSiXX)

P

(uppliers0$ow@mpl rowi L (uppliers0$ow@mpl)rowS

0&,Bransaction tr5 L 0&,Bransaction)getransaction)S

Gumber b L tr5.get(e%uencealueVFOBO(/++*@E$(O(V)S

&ttribute*ist a L &ttribute*ist)rowiS

(uppliers0$ow@mpl r L(uppliers0$ow@mpl)per"o.create&nd@nit$owa)S

(et here your uni%ue attribute "alues' @=m setting here (upplier @d as !or e"ery new row it should be

di!!erent.

r.set(upplier@db)S

per"o.insert$owr)S

R

R

35)/hat &or is:reparedForE!ecution<) and e!ecute=uer,<) methods used?



is+reparedForE5ecution !unction will chec2 whether all parameters are assigned properly and %uery is

ready !or e5ecution.

0n multiple na"igations to the page this %uery will not be e5ecuted multiple times.

hile e5ecuteuery !unction is used !or e5ecuting the 0 %uery so that it can !etch the data !rom

database into 0 cache.

36)Wh, 9hould /e 7i%e retain01>?

he &M should be retained whene"er you are na"igating away !rom a page and when you 2now that

there is a possibility to come bac2 to the page again and data is to be retained. E5ample - &ny

na"igation lin2 that opens in a new page or any na"igation which has a bac2 button to come bac2 to the

initial page.

he &M should not be retained !or two independent pages' especially i! they ha"e common 0s which

!etch di!!erent result sets. @n such cases' retaining the &M may not remo"e the cache o! 0s and so the

result may not be as e5pected.

3) What is the si7ni&icance o& add*readCrum->

he basic intention o! the breadcrumb is to let the user 2now o! the na"igation path he too2 to reach the

current page.

3") @o/ do ,ou &ind ri7ht de% patch &or ,our oracle application version.

Search in oracle.metalink.com as Jdev with OA Extension.

!) "hat are the tools #ou had used $or decompilin% &ava class'

Jad is one o$ the tool $or decompilin% the &ava class.

4() /hat is a +a%a-ean?

Ja"aBeans is an object#oriented programming inter!ace that lets you build re#useable applications or

program building bloc2s called components that can be deployed in a networ2 on any major operating

system plat!orm.

4') What is quer, *ean?

ueryBean is used to e5ecute and return the results o! a %uery on behal! o! the uery+ortlet

application.

42) /hat is the di&&erence -et/een autocustomi#ation criteria and result -ased search?

$esults based search generates search items automatically based on the columns on the results table.

@n &utocustomi6ation search we need to set what all !ields are re%uired to display as a search criteria.

43) /hat is 189?

M,( is Meta,ata (er"ice. hen a web page is bro2en into small units li2e buttons'!ields etc they are

stored in a database. hese are not stored as binary !iles but as data in tables. he data are present inJ,$ tables. M,( pro"ides ser"ice to store return page de!initions. M,( collects those de!initions in

components!ields in a meaning!ul manner to build a page.



45) What is 1?

M* is a mar2up language !or documents containing structured in!ormation.

(tructured in!ormation contains both content words' pictures' etc.) and some indication o! what role

that content plays !or e5ample' content in a section heading has a di!!erent meaning !rom content in a

!ootnote' which means something di!!erent than content in a !igure caption or content in a database

table' etc.).












Create Gew page



4) What is :ersonali#ation?+ersonali6ation enables you to declarati"ely tailor the /@ loo2#and#!eel' layout or "isibility o! page





> Folder Forms

> ,o Forms +ersonali6ation

4")Can ,ou e!tend e%er, possi-le 0pplication 1odule?


4$) What is root01?



5() Wh, can;t Root 01 -e e!tended?

he root &M is loaded !irst and a!ter that the M,( (ubstitutions are parsed.3ence $00 &M gets loaded e"en be!ore the time the substitutions de!inition !rom M,( layer get

wor2ed out.



0b"iously' the root am cant substitute itsel!' hence it can=t be e5tended.

5')/e ha%e W@EABV080EBRECOR8? What /ill -e the equi%alent to that in O0Frame/or?

0ns/er # /se a method named "alidateEntity) within the Entity 0bject.

52)in /hich e!tension to Vie/ O-ect is not up7rade sa&e?

Answer # @! the original "iew object was created in e5pert mode' then you will ha"e to copy the

0riginal 0 uery and then you will paste that (* (tmtuery into the e5tended iew 0bject.

Gow' i! 0racle were to change the original (* (tatement Tagainst original 0U' then those changes will

not be re!lected in e5tended iew 0bject.

@s there any solutionY

ell' yes' depends on what you wish to achie"e "ia personali6ation.

@! you simply wish to alter the where clause dynamically' then you might as well do that by e5tending

the controller.

Gote-# hen e5tending the C0' we are assuming that at least the selected table aliases !rom the

0riginal (* (tatement will not be remo"ed by 0racle=s patches.

53)@o/ do ,ou disa-le all the O0 Frame/or personali#ations in e*usiness 9uite ?

Ans( &ll the personali6ations done to the system can be disabled by simply setting a pro!ile option to

Ies at site le"el.Game o! this pro!ile option is something li2e ,isableZ(el!Z(er"iceZ+ersonalZ

Aote-# Iou can de#acti"ate personali6ations against indi"idual pages selecti"ely' by clic2ing on button

VManage +ersonali6ationsV. Iou may need to gi"e yoursel! access to responsibility named VFunctional

&dministratorV' so that you can disable personali6ations selecti"ely.

54)What is a 8ata-ase Connecti%it, File ?

@t is a .dbc !ile which is speci!ied in the project properties. he location o! this !ile on the ser"er is

NFG,O0+secure














Create Gew page



56) What is :ersonali#ation?

+ersonali6ation enables you to declarati"ely tailor the /@ loo2#and#!eel' layout or "isibility o! page





> Folder Forms

> ,o Forms +ersonali6ation

5)Can ,ou e!tend e%er, possi-le 0pplication 1odule?


5") What is root01?



OAF Interview Questions (for Oracle Application Framework)

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