In
the common development environment, the developer needs to test his application
many times and he needs to test the application very fast. But there is a long
process for viewing the changes that are made to code, we need to Edit ->
Build -> Deploy - > Test. This process was heavy even though most of the
tasks are automated by the j2ee.
How
this work does: Jdk 5 allows redefining a class [Chaning method names, adding
methods, adding fields] without dropping its class loader. That is when we make
some changes to the class , the class loader that already loaded the current
class takes the changes without the application being redeployed or deleting
the already loaded and existing instances. With Fast Swap, Java classes are
redefined in-place without reloading the Class Loader, thereby having the
decided advantage of fast turnaround times. This means that you do not have to
wait for an application to redeploy and then navigate back to wherever you were
in the Web page flow. Instead, you can make your changes, auto compile, and
then see the effects immediately.
This
feature works only in development mode. This is disabled automatically in
production mode.
NOTE:
modifications done to the files that are in exploded archive are only accessible
for fast swap. Files that are changed and kept in jar or any other archive
format are not supported.
Fast
swap can be enabled for web application by plaing
<fast-Swap>true</fast-swap>
, In Weblogic.xml file in web-inf.
Whereas
the same element is added to Weblogic-application.xml for enterprise
applications.
Happy
Learning J
