Simple Java Web Application for DevOps pipeline testing
Use maven to build the application.
The following command compiles the java sources, executes the unit tests, and generates an executable jar file of the application:
$ mvn clean package
Use maven to run the unit tests:
$ mvn clean test
To run the web app from the command line, type:
$ cd target
$ java -jar testwebapp-1.0.jar -p8080
where 8080 is the HTTP port to bind to. (Note that binding to port 80 requires root rights.)
The expected output is the following:
$ java -jar testwebapp-1.0.jar -p8080
WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance.
2022-07-13 20:13:24,666 INFO [testwebapp.TestWebApp] [main] Port set to: 8080
2022-07-13 20:13:24,682 INFO [org.eclipse.jetty.util.log] [Thread-0] Logging initialized @379ms to org.eclipse.jetty.util.log.Slf4jLog
2022-07-13 20:13:24,712 INFO [spark.embeddedserver.jetty.EmbeddedJettyServer] [Thread-0] == Spark has ignited ...
2022-07-13 20:13:24,712 INFO [spark.embeddedserver.jetty.EmbeddedJettyServer] [Thread-0] >> Listening on 0.0.0.0:8080
2022-07-13 20:13:24,714 INFO [org.eclipse.jetty.server.Server] [Thread-0] jetty-9.4.z-SNAPSHOT; built: 2019-04-29T20:42:08.989Z; git: e1bc35120a6617ee3df052294e433f3a25ce7097; jvm 16.0.1+9-24
2022-07-13 20:13:24,747 INFO [org.eclipse.jetty.server.session] [Thread-0] DefaultSessionIdManager workerName=node0
2022-07-13 20:13:24,748 INFO [org.eclipse.jetty.server.session] [Thread-0] No SessionScavenger set, using defaults
2022-07-13 20:13:24,751 INFO [org.eclipse.jetty.server.session] [Thread-0] node0 Scavenging every 600000ms
2022-07-13 20:13:24,770 INFO [org.eclipse.jetty.server.AbstractConnector] [Thread-0] Started ServerConnector@66b9f639{HTTP/1.1,[http/1.1]}{0.0.0.0:8080}
2022-07-13 20:13:24,771 INFO [org.eclipse.jetty.server.Server] [Thread-0] Started @468ms
Open http://localhost:8080 in the browser to verify that the web app is running. The expected output is "Hello World!".
The following steps are required to start the application on system bootup:
- copy the the systemd service file
systemd/testwebapp.serviceto the target host's /etc/systemd/system directory - copy the jar file to
/opt/testwebapp/lib/java/testwebapp-1.0.jar - issue the
sudo systemctl daemon-reloadcommmand - enable the service with
sudo systemctl enable testwebapp - start the service with
sudo systemctl start testwebapp
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