demo-rest-jersey-spring @

Prerequisites:

• PostgreSQL 14
• IDE
• JDK 8
• Maven 3.*

Install and run the project

1. download/clone the project
2. run docker-compose up postgres

• connect to the database (demo_rest_jersey/demo_rest_jersey)
• import in PostgreSQL the self-contained file that comes with the project - demo-rest-jersey-spring/src/main/resources/input_data/DumpRESTdemoDB.sql

3. change to the root folder of the project and execute the following maven command

• mvn clean install jetty:run -Djetty.port=8888 -DskipTests=true
• now the REST api is up and running with Jetty on localhost:8888

Testing the project

From Maven (failsafe plugin)

Run the following maven command on the console in the root directory of the project

mvn clean install verify -Djetty.port=8888

Go to blog post

Tutorial – REST API design and implementation in Java with Jersey and Spring - complete explanation of this implementation.

OTEL-LGTM

Thanks to grafana blog, we can launch a complete observability stack : https://grafana.com/blog/2025/07/08/observability-in-under-5-seconds-reflecting-on-a-year-of-grafana/otel-lgtm/

run the mvn-otel.sh script to startup the observability stack.

Zero-code instrumentation

Configuring auto-instrumentation

https://opentelemetry.io/docs/zero-code/java/agent/getting-started/

Annotations

https://opentelemetry.io/docs/zero-code/java/agent/annotations/

Direct Projections instead of JPA Entities to Domain conversion