arun-gupta/docker-java-sample

A simple Java sample that shows how to package Java application using Docker

Docker Java Sample

This repository contain samples that shows integration of Docker and Java.

Maven

Classical

1. Build app: mvn package

2. Run app: mvn exec:java

With Docker

1. Build image: mvn package -Pdocker

2. Run container: mvn install -Pdocker

With DC/OS

1. Run application: mvn install -Pdcos

Gradle

Classical

1. Build app: ./gradlew build

2. Run app: ./gradlew run

With Docker

1. Build image: ./gradlew dockerBuildImage

2. Run container: ./gradlew startContainer

docker-java-sample's Issues

Project does not compile with Java9

I'm using this example as part of the DockerCon Java Workshop and this example does not compile with Java9. Likely the same hint as in https://github.com/docker/labs/blob/master/developer-tools/java/chapters/ch03-build-image.adoc#create-a-simple-java-application applies.

Need to upgrade dependency for gradle-docker-plugin

Current build uses a version of gradel file uses a dockerBuildImage that creates the following error.

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':dockerBuildImage'.
> Failed to parse dockerCfgFile: /home/chris-pauley/.docker/config.json

When I upgraded to 3.2.1 the problem was resolved.

    dependencies {
        classpath 'com.bmuschko:gradle-docker-plugin:3.2.1'
    }

Fails with "no DOCKER_HOST" error

With:
mvn package -Pdocker

Got the following after running an unchanged clone:

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 27.216 s
[INFO] Finished at: 2019-05-21T17:54:32-07:00
[INFO] Final Memory: 27M/198M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal io.fabric8:docker-maven-plugin:0.20.1:build (docker:build) on project helloworld: Execution docker:build of goal io.fabric8:docker-maven-plugin:0.20.1:build failed: No given, no DOCKER_HOST environment variable, no read/writable '/var/run/docker.sock' or '//./pipe/docker_engine' and no external provider like Docker machine configured -> [Help 1]

On ubuntu 16 using docker 18.0.9:
$ sudo docker version
Client:
Version: 18.09.6
API version: 1.39
Go version: go1.10.8
Git commit: 481bc77
Built: Sat May 4 02:35:27 2019
OS/Arch: linux/amd64
Experimental: false

Server: Docker Engine - Community
Engine:
Version: 18.09.6
API version: 1.39 (minimum version 1.12)
Go version: go1.10.8
Git commit: 481bc77
Built: Sat May 4 01:59:36 2019
OS/Arch: linux/amd64
Experimental: false