Getting started with Weld
Weld comes with a number of examples. We recommend you start with
examples/jsf/translator. Numberguess is
a web (war) example containing only non-transactional managed beans.
This example can be run on a wide range of servers, including WildFly,
GlassFish, Apache Tomcat, Jetty, and any compliant
Java EE 8 container. Translator is an enterprise (ear) example that
contains session beans. This example must be run on WildFly 14 or better,
GlassFish 5.1 or better, or any compliant Java EE 8 container.
Both examples use JSF 2.3 as the web framework and, as such, can be
found in the
examples/jsf directory of the Weld distribution.
To run the examples with the provided build scripts, you’ll need the following:
the latest release of Weld, which contains the examples
Maven 3, to build and deploy the examples
optionally, a supported runtime environment (minimum versions shown)
WildFly 14 (14.0.1.Final recommended),
GlassFish 5.1.0 or better,
Apache Tomcat 9 or better (war example only), or
Jetty 9 or better (war example only)
In the next few sections, you’ll be using the Maven command (
invoke the Maven project file in each example to compile, assemble and
deploy the example to WildFly and, for the war example, Apache Tomcat.
You can also deploy the generated artifact (war or ear) to any other
container that supports Java EE 8, such as GlassFish 5.
The sections below cover the steps for deploying with Maven in detail.
If you simply want to run the numberguess example without the requirement of a specific runtime you can start with the following commands:
$> cd examples/jsf/numberguess $> mvn wildfly:run
Deploying to WildFly
To deploy the examples to a WildFly instance, you’ll need to download WildFly first. The good news is that there are no additional modifications you have to make to the server. It’s ready to go!
After you have downloaded WildFly, extract it. You can move the extracted folder anywhere you
like. Wherever it lays to rest, that’s what we’ll call the WildFly
installation directory, or
$> unzip wildfly-14.0.1.Final.zip $> mv wildfly-14.*/ wildfly-14
In order for the build scripts to know where to deploy the example, you
have to tell them where to find your WildFly installation. Set the
JBOSS_HOME environment variable to point to the WildFly installation,
$> export JBOSS_HOME=/path/to/wildfly-14
You’re now ready to run your first example!
Switch to the
examples/jsf/numberguess directory and execute the Maven
$> cd examples/jsf/numberguess $> mvn wildfly:deploy
|If you are using Eclipse, you should seriously consider installing the JBoss Tools add-ons, which include a wide variety of tooling for CDI and Java EE development, as well as an enhanced WildFly server view.|
Wait a few seconds for the application to deploy (or the application server to start) and see if you can determine the most efficient approach to pinpoint the random number at the local URL http://localhost:8080/weld-numberguess.
The Maven WildFly plugin includes additional goals for WildFly to deploy and undeploy the archive.
For more information on the WildFly Maven plugin see the plugin documentation.
You can also run functional tests to verify that the example works as expected. Run:
$> mvn verify -Darquillian=wildfly-managed
You should see the following output:
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0
The second starter example,
weld-translator, will translate your text
into Latin. (Well, not really, but the stub is there for you to
implement, at least. Good luck!) To try it out, switch to the translator
example directory and execute the deploy target:
$> cd examples/jsf/translator/ear $> mvn wildfly:run
|The translator uses session beans, which are packaged in an EJB module within an ear. Java EE 8 allows session beans to be deployed in war modules, but that’s a topic for a later chapter.|
Again, wait a few seconds for the application to deploy (if you’re really bored, read the log messages), and visit http://localhost:8080/weld-translator to begin pseudo-translating.
Again, functional tests can be running by executing:
$> cd examples/jsf/translator/ftest $> mvn verify -Darquillian=wildfly-managed
Deploying to GlassFish
Deploying to GlassFish should be easy and familiar, right? After all, it’s the Java EE 8 reference implementation and Weld is the CDI reference implementation, meaning Weld gets bundled with GlassFish. So yes, it’s all quite easy and familiar.
To deploy the examples to GlassFish, you’ll need a GlassFish 5.1.0 release. Extract
the zip to a directory of your choice and set the
variable. Switch to the
GLASSFISH_HOME directory and start the server:
$> ./bin/asadmin start-domain
Now you can deploy the example.
$> ./bin/asadmin deploy /path/examples/jsf/numberguess/target/weld-numberguess.war
Once the command completes the application is available at http://localhost:8080/weld-numberguess
The reason the same artifact can be deployed to both WildFly and GlassFish, without any modifications, is because all of the features being used are part of the standard platform. And what a capable platform it has become!
Deploying to Apache Tomcat
Servlet containers are not required to support Java EE services like CDI. However, you can use CDI in a servlet container like Tomcat by embedding a standalone CDI implementation such as Weld.
Weld comes with servlet integration extension which bootstraps the CDI environment and provides injection into servlets components. Basically, it emulates some of the work done by the Java EE container, but you don’t get the enterprise features such as session beans and container-managed transactions.
|Note that due to limitations of servlet containers (e.g. read-only JNDI) your application might require some additional configuration as well (see Tomcat and Jetty for more info).|
Let’s give the Weld servlet extension a spin on Apache Tomcat. First, you’ll need to download Tomcat 9.0.11 or later from tomcat.apache.org and extract it.
$> unzip apache-tomcat-9.0.11.zip
The Maven plugin communicates with Tomcat over HTTP, so it doesn’t care
where you have installed Tomcat. However, the plugin configuration
assumes you are running Tomcat in its default configuration, with a
hostname of localhost and port
readme.txt file in the
example directory has information about how to modify the Maven settings
to accommodate a different setup.
You can either start Tomcat from a Linux shell:
$> cd /path/to/apache-tomcat-9 $> ./bin/startup.sh
a Windows command window:
$> cd c:\path\to\apache-tomcat-9\bin $> start
or you can start the server using an IDE, like Eclipse.
Change to the
examples/jsf/numberguess directory again and run the
following Maven command:
$> cd examples/jsf/numberguess $> mvn clean package -Ptomcat
Now you’re ready to deploy the numberguess example to Tomcat!
$> cp examples/jsf/numberguess/target/weld-numberguess.war apache-tomcat/webapps/