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Liberty Container

The Liberty container runs Java EE 6 and 7 applications on IBM's WebSphere Application Server Liberty Profile. It recognizes Web Archive (WAR) and Enterprise Archive (EAR) files as well applications deployed as a Liberty server directory or packaged server.

Detection Criterion
  • Existence of a WEB-INF/ folder in the application directory and Java Main is not detected, or
  • Existence of a META-INF/ folder in the application directory and Java Main is not detected, or
  • Existence of a server.xml file in the application directory, or
  • Existence of a wlp/usr/servers/*/server.xml file in the application directory.
Tags liberty-⟨version⟩, WAR (if WAR file is detected), EAR (if EAR file is detected), SVR-DIR (if Liberty server directory is detected), SVR-PKG (if Liberty packaged server is detected)
Tags are printed to standard output by the Buildpack `detect` script.

If the application uses Spring, Spring profiles can be specified by setting the SPRING_PROFILES_ACTIVE environment variable. This is automatically detected and used by Spring. The Spring Auto-reconfiguration Framework will specify the cloud profile in addition to any others.

Configuration

The Liberty container can be configured by modifying the config/liberty.yml file in the buildpack fork or by passing an environment variable that overrides configuration in the yml file. The container uses the Repository utility support and it supports the version syntax.

Name Description
repository_root The URL of the Liberty repository index (details).
version The version of the Liberty profile. You can find the candidate versions here.
type The archive type of Liberty runtime to download. One of webProfile6, webProfile7, javaee7, or kernel. The default value is webProfile7.
minify Boolean indicating whether the Liberty server should be minified. The default value is false.
liberty_repository_properties Liberty repository configuration.
app_archive Default configuration for WAR and EAR files.

Minify

Minification potentially reduces the size of the deployed Liberty server because only the requested features are included. This might result in longer push times.

The minify option can be overridden on a per-application basis by specifying a minify environment variable in the manifest.yml for the application. For example:

  env:
    minify: true

Liberty repository configuration

By default, the buildpack will download the Liberty features specified in the server.xml from the Liberty repository. To disable this feature, set the useRepository option to false.

liberty_repository_properties:
  useRepository: true

When the useRepository option to true, you can pass additional properties under the liberty_repository_properties element to customize the repository information. The additional properties that can be set are defined in the installUtility documentation. For example, the following specifies a custom feature repository and disables access to the Liberty repository:

liberty_repository_properties:
  useRepository: true
  useDefaultRepository: false
  myRepo.url: http://dev.repo.ibm.com:9080/ma/v1
  myRepo.user: myUser
  myRepo.userPassword: myPassword

Default configuration

The buildpack provides a default server.xml configuration when deploying WAR or EAR files. That default configuration is populated with a list of Liberty features based on the ["app_archive"]["features"] setting. The ["app_archive"]["implicit_cdi"] setting controls whether archives that do not contain the beans.xml file are scanned for CDI annotations.

app_archive:
 # Scan archives that do not contain beans.xml for bean-definition annotations (cdi 1.2)
 implicit_cdi: false
 # Default features
 features:
 - beanValidation-1.1
 - cdi-1.2
 - ejbLite-3.2
 - el-3.0
 - jaxrs-2.0
 - jdbc-4.1
 - jndi-1.0
 - jpa-2.1
 - jsf-2.2
 - jsonp-1.0
 - jsp-2.3
 - managedBeans-1.0
 - servlet-3.1
 - websocket-1.1

Common Configuration Overrides

The Liberty container configuration can be overridden with the JBP_CONFIG_LIBERTY environment variable. The value of the variable should be valid inline YAML. For example:

  1. Configure the Liberty container to enable a custom set of Liberty features (for WAR and EAR files only):

    $ cf set-env myApplication JBP_CONFIG_LIBERTY 'app_archive: {features: [jsp-2.3, websocket-1.1]}'

  2. Configure the Liberty container to download and install Liberty profile runtime with all Java EE 7 features:

    $ cf set-env myApplication JBP_CONFIG_LIBERTY 'type: javaee7'

  3. Configure the Liberty container to download and install Liberty profile beta:

    $ cf set-env myApplication JBP_CONFIG_LIBERTY 'version: 2015.+'

The environment variables can also be specified in the manifest.yml file.