Spring Boot + Apache Cassandra

This is an example Spring Boot + Apache Cassandra app.

It was made using Spring Boot, Apache Cassandra, Spring Security, Spring Data Cassandra, Docker and Docker Compose.

##Configuration

If you are not using localhost Cassandra, it is necessary to configure it to use proper endpoints.

Configuration files

Folder src/resources/ contains config files for spring-boot-cassandra Spring Boot application.

• src/resources/application.properties - main configuration file

Environment variables

Configuration using environment variables is done using next variables:

• SPRING_DATA_CASSANDRA_CONTACT_POINTS - Cassandra cluster endpoints

• SPRING_DATA_CASSANDRA_KEYSPACE_NAME - Cassandra keyspace

Example:

$ export SPRING_DATA_CASSANDRA_CONTACT_POINTS=cassandra_contact_point1,cassandra_contact_point2
$ export SPRING_DATA_CASSANDRA_KEYSPACE_NAME=cassandra_keyspace_name

Command line arguments

It is also possible to pass these configuration settings using command line arguments. Example:

$ java -Djava.security.egd=file:/dev/./urandom -jar app.jar \
    --spring.data.cassandra.contact-points=assandra_contact_point1,cassandra_contact_point2 \
    --spring.data.cassandra.keyspace-name=keyspace-name

How to run

Maven

open a terminal and run the following commands to ensure that you have valid versions of Java and Maven installed:

$ java -version
java version "1.8.0_102"
Java(TM) SE Runtime Environment (build 1.8.0_102-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.102-b14, mixed mode)

$ mvn -v
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T16:41:47+00:00)
Maven home: /usr/local/Cellar/maven/3.3.9/libexec
Java version: 1.8.0_102, vendor: Oracle Corporation

Using the Maven Plugin

The Spring Boot Maven plugin includes a run goal that can be used to quickly compile and run your application. Applications run in an exploded form, as they do in your IDE. The following example shows a typical Maven command to run a Spring Boot application:

$ mvn spring-boot:run

Using Executable Jar

To create an executable jar run:

$ mvn package

To run that application, use the java -jar command, as follows:

$ java -jar target/spring-boot-cassandra-0.0.1-SNAPSHOT.jar

To exit the application, press ctrl-c.

Docker

It is possible to run spring-boot-cassandra and Cassandra using Docker:

spring-boot-cassandra

Build Docker image:

$ mvn package
$ docker build -t spring-boot-cassandra:dev -f docker/spring-boot-cassandra/Dockerfile .

Run Docker container:

$ docker run --rm -i -p 9003:9003 \
      -e SPRING_DATA_CASSANDRA_CONTACT_POINTS=$SPRING_DATA_CASSANDRA_CONTACT_POINTS \
      -e SPRING_DATA_CASSANDRA_KEYSPACE_NAME=$SPRING_DATA_CASSANDRA_KEYSPACE_NAME \
      --name spring-boot-cassandra \
      spring-boot-cassandra:dev

Helper script

It is possible to run all of the above with helper script:

$ chmod +x scripts/run_docker.sh
$ scripts/run_docker.sh

Cassandra

Build Docker image:

$ docker build -t cassandra:dev -f docker/cassandra/Dockerfile .

Run Docker container:

$ docker run --rm -i \
      -p 9042:9042 \
      --name cassandra \
      cassandra:dev

Helper script

It is possible to run all of the above with helper script:

$ chmod +x scripts/run_docker_cassandra.sh
$ scripts/run_docker_cassandra.sh

Docker Compose

Docker Compose file docker/docker-compose.yml is written to facilitate running of both properly initialized Cassandra, as well of the spring-boot-cassandra containers.

Run Docker Compose:

$ mvn package
$ docker-compose -f docker/docker-compose.yml up --build --force-recreate --abort-on-container-exit

Helper script

It is possible to run all of the above with helper script:

$ chmod +x scripts/run_docker_compose.sh
$ scripts/run_docker_compose.sh

Docker

Folder docker/spring-boot-cassandra contains Dockerfile for:

• docker/spring-boot-cassandra/Dockerfile - Docker build file for executing spring-boot-cassandra Docker image. Instructions to build artifacts, copy build artifacts to docker image and then run microservice on proper port with proper configuration file.

• docker/spring-boot-cassandra/wait-for-it.sh - is a pure bash script that will wait on the availability of a host and TCP port. It is useful for synchronizing the spin-up of interdependent services, such as linked docker containers. Since it is a pure bash script, it does not have any external dependencies. https://github.com/vishnubob/wait-for-it

Folder docker/cassandra contains:

• docker/cassandra/Dockerfile - Docker build file for Cassandra Docker image.

• docker/cassandra/docker-entrypoint.sh - Entrypoint shell script for running Cassandra and executing CQL files after Cassandra is initialized. https://github.com/dschroe/cassandra-docker

• docker/cassandra/initial-seed.cql - Schema definition and imports for Cassandra.

Util Scripts

• scripts/run_docker.sh.sh - util script for running spring-boot-cassandra Docker container using docker/spring-boot-cassandra/Dockerfile

• scripts/run_docker_cassandra.sh - util script for running Cassandra Docker container using docker/cassandra/Dockerfile

• scripts/run_docker_compose.sh - util script for running Docker Compose.

Tests

Tests can be run by executing following command from the root of the project:

$ mvn test