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runtime-builder-java

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A Google Cloud Container Builder pipeline for packaging Java applications into docker containers

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# Java Runtime Builder

A [Google Cloud Container Builder](https://cloud.google.com/container-builder/docs/) pipeline for 
packaging Java applications into supported Google Cloud Runtime containers. It consists of a series
of docker containers, used as build steps, and a build pipeline configuration file.

## Running via Google Cloud Container Builder (recommended)
To run via Google Cloud Container Builder, first install the
[Google Cloud SDK](https://cloud.google.com/sdk/). Then, initiate a Cloud Container Build using the 
provided [java.yaml](java.yaml) file:
```bash
# Determine the name of your desired output image. Note that it must be a path to a Google Container
# Registry bucket to which your Cloud SDK installation has push access.
OUTPUT_IMAGE=gcr.io/my-gcp-project/my-application-container

# initiate the cloud container build
gcloud builds submit /path/to/my/java/app \ 
    --config java.yaml \
    --substitutions _OUTPUT_IMAGE=$OUTPUT_IMAGE
```
After the build completes, the built application container will appear in the [gcr.io container 
registry](https://cloud.google.com/container-registry/) at the specified path.

## Running via Docker (without Cloud Container Builder)
Build steps can be run locally, one at a time, using docker. (This requires that the `runtime-builder`
image is available locally.) Note that these commands effectively mirror the steps in the
[java.yaml](java.yaml) pipeline config file.

```bash
LOCAL_APPLICATION_DIR=/path/to/my/app

# Generate docker resources
# See java.yaml for the fully specified jdk-runtimes-map server-runtimes-map args
docker run -v $LOCAL_APPLICATION_DIR:/workspace -w /workspace runtime-builder

# package my application into a docker container
docker build -t my-app-container $LOCAL_APPLICATION_DIR
```

## Configuration
An [app.yaml](https://cloud.google.com/appengine/docs/flexible/java/configuring-your-app-with-app-yaml) 
file can be included in the sources passed to the Java Runtime Builder, but is not required. The 
`runtime_config` section of this file tells the builder how to build and package your source. 
In most cases, `runtime_config` can be omitted.

Alternatively, these settings can be provided as command line arguments to the Java Runtime Builder.

| Option Name | Type | Default | Description |
|----------|------|---------|-------------|
| jdk | string | openjdk8 | Select the JDK used in the generated image. Must be either `openjdk8` or `openjdk9`. NOTE: `openjdk9` is not compatible with the `server` option (see below).
| server | string | jetty | Select the web server to use in the generated image. Must be either `jetty9` or `tomcat8`
| artifact | string |  Discovered based on the content of your build output | The path where the builder should expect to find the artifact to package in the resulting docker container. This setting will be required if your build produces more than one artifact. 
| build_script | string | `mvn -B -DskipTests clean package` if a maven project is detected, or `gradle build` if a gradle project is detected | The build command that is executed to build your source |
| jetty_quickstart | boolean | false | Enable the [Jetty quickstart module](http://www.eclipse.org/jetty/documentation/9.4.x/quickstart-webapp.html) to speed up the start time of the application (Only available if the jetty runtime is selected).

The settings in app.yaml and the command line share the same names. For example, `--jdk=openjdk8`
can be included in the `args:` section of [java.yaml](java.yaml). If a setting is provided in both
app.yaml and the command line, the setting from the command line will be used.
### Sample app.yaml
```yaml
runtime: java
env: flex

# all parameters specified below in the runtime_config block are optional
runtime_config:
  artifact: "target/my-artifact.jar"
  build_script: "mvn clean install -Pcloud-build-profile"
  jetty_quickstart: true
```
### Images

The `--jdk-runtimes-map` and `--server-runtimes-map` settings are optional in both
[java.yaml](java.yaml) when using the Cloud Container Builder as well as when building locally.
These are the default mappings and will be available unless individually overridden:

| JDK Runtime Mapping | Default |
|-----------------|-------------|
|`*`| `gcr.io/google-appengine/openjdk:8`|
|`openjdk8`|`gcr.io/google-appengine/openjdk:8`|
|`openjdk9`|`gcr.io/google-appengine/openjdk:9`|

| Server Runtime Mapping | Default |
|-----------------|-------------|
|`*`&#124;`*`|`gcr.io/google-appengine/jetty:9`|
|`openjdk8`&#124;`*`|`gcr.io/google-appengine/jetty:9`|
|`openjdk8`&#124;`jetty9`|`gcr.io/google-appengine/jetty:9`|
|`openjdk8`&#124;`jetty`|`gcr.io/google-appengine/jetty:9`|
|`openjdk8`&#124;`tomcat8`|`gcr.io/google-appengine/tomcat:8`|
|`openjdk8`&#124;`tomcat`|`gcr.io/google-appengine/tomcat:8`|
|`*`&#124;`jetty9`|`gcr.io/google-appengine/jetty:9`|
|`*`&#124;`jetty`|`gcr.io/google-appengine/jetty:latest`|
|`*`&#124;`tomcat8`|`gcr.io/google-appengine/tomcat:8`|
|`*`&#124;`tomcat`|`gcr.io/google-appengine/tomcat:latest`|

These settings are also optional:

| Command Line Settings | Default |
|-----|-----|
|`--compat-runtime-image`|`gcr.io/google-appengine/jetty9-compat:latest`|
|`--maven-docker-image`|`gcr.io/cloud-builders/mvn:3.5.0-jdk-8`|
|`--gradle-docker-image`|`gcr.io/cloud-builders/gradle:4.0-jdk-8`|

## Development guide
* See [DEVELOPING.md](DEVELOPING.md) for instructions on how to build and test this pipeline.

## Contributing changes

* See [CONTRIBUTING.md](CONTRIBUTING.md)

## Licensing

* See [LICENSE](LICENSE)

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