Migrating Tomcat's Hello World to GlassFish
Earlier I introduced the
Migrate to GlassFish project. Periodically, I will be taking
examples to illustrate migrations to GlassFish. Here, I took the href="http://tomcat.apache.org/tomcat-6.0-doc/appdev/sample/">Tomcat
example application and migrated it to GlassFish. Even though this
is a simple example, it nonetheless illustrates a few of the
deployment aspects of GlassFish.
First point to note is that no changes are necessary for the Tomcat
sample application itself. Apache Tomcat version 6.0 implements the
Servlet 2.5 and JavaServer Pages 2.1 specifications. GlassFish V2
implements which Java EE 5 which requires JSP 2.1 and Servlet 2.5. So
you can can simply take the war file and deploy it as shown below:
- Download and configure
- asadmin start-domain
- asadmin deploy --user admin --passwordfile sample.war
- I used the command line admin commands but you can use the
admin console GUI.
- The password file contains the admin password in the form
Note that no other GlassFish server specific deployment descriptors
(e.g. sun-web.xml ). The context root for the web application is
derived from the war file name (in this case "sample"). You can
acccess the sample application at http://localhost:8080/sample .
If you access the URL, you should see "Hello World" application with
two links to "JSP Page" and "Servlet" .
When deployed as shown above, the JSP in the sample application are
compiled at runtime the first time the "JSP Page" link is
accessed. However, it is possible to precompile JSP at deployment time
- asadmin undeploy --user admin --passwordfile passwordfile sample
asadmin deploy --user admin --passwordfile passwordfile --precompilejsp sample.war
You will find the compiled JSP files can be found in
. There are other ways to precompile JSP files. The above was just
one way to do it.
Instead of war, you can deploy the sample application in an unpacked
form. This is useful during development To do this:
- unpack the sample.war into sample-dir
- asadmin deploydir --user admin --passwordfile passwordfile sample-dir
I will be back with more examples.
If you are migrating applications to GlassFish, post your
questions and feedback to Migrate
To GlassFish forum and visit href="https://migrate2glassfish.dev.java.net">Migrate To GlassFish project.