BEHAVIOUR of JSP Cache in R12

There is a change in the default behaviour of handling JSP cache in R12 as opposed to 11i.

JSPs were handled by Apache Jserv engine in 11i and is being handled by OC4J (10.1.3 AS) in R12.

In 11i, when we clear cache ($COMMON_TOP/_pages) and try to  access JSP pages,
it gets automatically recompiled. However, this is not the case in R12 by default.

In R12 instance, if you clear _pages and restart apache,you will only get a blank screen
since AppsLocalLogin.jsp wouldn’t get compiled by default. You will not even see a new _pages directory.

As per Oracle, whenever JSP cache is cleared, we have to run “ojspCompile.pl –compile –flush -p 2”
to recompile ALL jsp pages in the Application.  This will take roughly around 15 to 20 mts.
However, in the real world (atleast in the pre-production stage) this is not affordable.

The solution to this is to change the XML file parameter “s_jsp_main_mode” to a value of “recompile”
from the default value of “justrun” and run autoconfig. JSP pages will be recompiled automatically
after this change.

Note:  742107.1 – How To Clear Caches (Apache/iAS, Cabo, Modplsql, Browser, Jinitiator, Java, Portal, WebADI)
for E-Business Suite

Clearing Cache(compile all jsps) in R12 instance

1-       Stop Apache --- adapcctl.sh stopall

2-       2- Clear cache  cd $COMMON_TOP/-----remove _pages  and create _pages

3-       mkdir _pages

4-       chmod 777 _pages

5-       cd $FND_TOP/patch/115/bin

6-       $ ./ojspCompile.pl --compile --flush -p 2

logfile set: /test/mtlog/test_localhost/logs/appl/rgf/ojsp/ojspc_error.log

starting...(compiling all)

using 10i internal ojsp ver: 10

synchronizing dependency file:

enumerating jsps...8001

parsing jsp...8001

writing deplist...8001

initializing compilation:

eliminating children...5912 (-2089)

translating and compiling:

translating jsps...5912/5912 in 4m39s                

compiling jsps...5912/5912 in 17m30s                

Finished!

7- Start Apache -- adapcctl.sh startall

Compiling single jsp

ojspCompile.pl --compile -s 'fnd%' -p 20

How to clear cache for a specific component in R12

As we all know the normal tendency for clearing cache in Oracle Apps is to delete the $COMMON_TOP/_pages directory.In 11i, after deleting we dont have to recompile the jsps but in R12 we have to recompile the pages since s_jsp_main_mode is set to justrun by default which is in turn updated in orion-web.xml

How can i clear cache for a specific component of Oracle Apps R12 viz., iprocurement, istore etc.,

Is this even possible ? Yes it is and this option comes handy when somebody modifies a jsp page which is part of say istore,then it makes sense to clear cache for istore and not for the whole server.

Clearing cache for specific Component/Application in R12

Login as sysadmin

Select Functional Administrator responsibility

Go to Core Services ==> Caching Framework ==> Tuning

Query the application (for example iStore) or by Name or code.

Select the component and clear the cache.

Note: For some specific configuration changes, we need to bounce Apache also.

Clearing Global Cache in R12

a) Go to Functional Administrator Responsibility

b) Go to Core Services ==> Caching Framework

c) Go to Global configuration and clear all the cache from there.(Only If you want to clear all the  cache)