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Updating Web Applications
During development, you will often need to make changes to Web applications. After you modify a servlet, you must
When you update a JSP page, you do not need to recompile or reload the application, because Tomcat does this automatically.
To try this feature, modify the servlet version of the Hello application. For example, you could change the greeting returned by
GreetingServlet
to be:To update the file:
The procedure for updating the application in the server depends on whether you installed it using the
Ant
install
task or deployed it using theAnt
deploy
task.Reloading Web Applications
If you have installed an application using the
Ant
install
command, you update the application in the server using theAnt
reload
task:The example build files contain an
Ant
remove
target that invokes theAnt
remove
task. Thus to update theHello1
application in the server, executeant
reload
. To view the updated application, reload theHello1
URL in the client. Note that thereload
task only picks up changes to Java classes, not changes to theweb.xml
file. To reloadweb.xml
, remove the application (see Removing Web Applications) and install it again.You should see the screen in Figure 4-3 in the browser:
![]()
To try this on the JSP version of the example, first build and deploy the JSP version of the Hello application:
- In a terminal window, go to
<
INSTALL
>/jwstutorial12/examples/web/hello2.
- Run
ant
build
. Thebuild
target will spawn any necessary compilations and copy files to the<
INSTALL
>/jwstutorial12/examples/web/hello2/build
directory.- Run
ant
install
. Theinstall
target copies the build directory to<JWSDP_HOME>
/webapps
and notifies Tomcat that the new application is available.Modify one of the JSP files. Then run
ant
build
to copy the modified file intojwstutorial12/examples/web/hello2/build
. Remember, you don't have to reload the application in the server, because Tomcat automatically detects when a JSP page has been modified. To view the modified application, reload theHello2
URL in the client.Redeploying Web Applications
If you have deployed the application using the
Ant
deploy
task you update the application by using theAnt
undeploy
task (see Undeploying Web Applications) and then using theAnt
deploy
task.
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