exercise1

Exercise 1

Run and hack on a Quarkus project

In this exercise, we will run a Quarkus project and play with it to get familiar with some basic commands and constructs!

0. Start Quarkus in Dev mode

./mvnw quarkus:dev

keep this running in a separate terminal window throughout this exercise!

1. View app in web browser

Go to http://localhost:8080/hello

2. Look at the code for the RESTful endpoint

Open this project in a Java editor/IDE

Open exercise1/src/main/java/org/example/exercise1/GreetingResource.java

3. Play around with hot-reloading

Change the String in the last line:

return "hello"

to something else.

Do not restart the anything, simply go to the web browser, and hit reload. Quarkus automatically loads your changes without restarting the app server!

4. Create an executable JAR file

./mvnw package

Then see what was produced, look into the target directory:

 // unix
ls -l target

 // windows
 dir target

╰─ ls -1 target 
classes
exercise1a-1.0-SNAPSHOT-runner.jar
exercise1a-1.0-SNAPSHOT.jar
generated-sources
generated-test-sources
lib
maven-archiver
maven-status
quarkus
surefire-reports
test-classes

The *-runner is the file we can use to run the app!

Run the application in standard mode

java -jar target/exercise1a-1.0-SNAPSHOT-runner.jar 

Look for this on the first line: " started in 0.663s. "

Note how quickly this Quarkus application starts up!

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