JPAstreamer example

Table of Contents

• Introduction
• What is JPAstreamer
• How does JPAstreamer work with Spring Boot?
• How does it run?
• How does it check?

Introduction

In this simple example we are going to see how to use java streams with JPA thanks to JPAstreamer.

What is JPAstreamer

JPAstreamer is a library for expressing JPA/Hibernate/Spring queries using standard Java streams.

How does JPAstreamer work with Spring Boot?

To use JPAstreamer together with Spring Boot we need to add maven dependencies and inject as dependency JPAStreamer in every class that we want to use it.

To work with JPAstreamer in our classes we are going to use it as Java Stream. For example if we want to find all records of car entity we are going to do:

jpaStreamer.stream(Car.class)
              .collect(Collectors.toList());

We also have to keep in mind that we need spring-boot-starter-data-jpa.

How does it run?

This is a spring boot application so to run it you can run with maven:

mvn spring-boot:run

from your IDE running the class

JpastreamerExampleApplication

or running your *.jar

java -jar *.jar

How does it check?

We have some endpoints with GET to verify and check this example:

-Brand
http://localhost:8090/brand/
http://localhost:8090/brand/{id}
http://localhost:8090/brand?name={Name}

-Car
http://localhost:8090/car/{id}
http://localhost:8090/car

Examples:
http://localhost:8090/brand/2
http://localhost:8090/brand?name=Mercedes
http://localhost:8090/car/1