libertyExtensions.md

Liberty extension properties

The Liberty Gradle plugin defines properties in the liberty block to customize task behavior. These properties are divided in two groups:

• The general runtime properties which control how the runtime is installed with the installLiberty task.
• The Liberty server configuration properties control how a server is initialized and the applications that are installed. These properties are defined in a server block within the liberty block.

The installLiberty, compileJSP and libertyDevc tasks can be configured with their related extension inside the liberty block.

The deploy, undeploy, libertyPackage, installFeature, uninstallFeature, cleanDirs, libertyDump, and libertyJavaDump tasks can be configured with their related extension inside the server block.

General runtime properties

Attribute	Type	Since	Description	Required
baseDir	String	3.0	The base installation directory. The actual installation directory of WebSphere Liberty server will be ${baseDir}/wlp. The default value is ${project.buildDir}. This was moved from the properties in the install block in version 3.0.	No
cacheDir	String	3.0	The directory used for caching downloaded files such as the license or .jar files. The default value is ${java.io.tmpdir}/wlp-cache. This was moved from the properties in the install block in version 3.0.	No
installDir	String	1.0	Path to the WebSphere Liberty server installation wlp directory. To use a pre-installed version of Liberty, set this property to the path of the Liberty wlp directory, including wlp in the path. Additionally, installDir can be specified in the gradle.properties file or from the command line.	No
outputDir	String	1.0	Deprecated. Value of the ${wlp_output_dir} variable. The default value is ${installDir}/usr/servers/${serverName}. This parameter has moved to the server block.	No
runtime	Properties	3.0	For overriding the group, name or version of the libertyRuntime installed from The Central Repository. The default runtime artifact is the latest version of io.openliberty:openliberty-kernel.
userDir	String	1.0	Value of the ${wlp_user_dir} variable. The default value is ${installDir}/usr/.	No

Liberty server configuration

The server extension allows you to configure all the characteristics of a particular named server including configuration files, applications to install, and server specific properties and variables. To configure the server, add the server block to the liberty block in your build.gradle file.

The following properties are supported for server configuration.

Server extension properties

Attribute	Type	Since	Description	Required
apps	List	2.0	List of war and ear task objects used to create applications to copy to the apps folder. If no apps or dropins are configured and this project applies the war or ear plugin, the default application is installed using the deploy task. If the application is not configured in the server.xml file, application configuration is added to the configDropins folder.	No
dropins	List	2.0	List of war or ear objects used to create applications to copy to the dropins folder.	No
bootstrapProperties	Properties	3.0	Inline bootstrap Properties that are written to the bootstrap.properties file in the server directory. These properties take precedence over a specified bootstrap.properties file. This was changed from a Map to a Properties object in 3.0.	No
bootstrapPropertiesFile	File	2.0	Location of the file containing server properties to copy to the bootstrap.properties file in the server instance.	No
clean	boolean	1.0	Clean all cached information on server start up. It deletes every file in the ${wlp_output_dir}/logs, ${wlp_output_dir}/workarea, ${wlp_user_dir}/dropins or ${wlp_user_dir}/apps. The default value is false. Only used with the libertyStart and libertyRun tasks.	No
configDirectory	File	2.0	Location of a server configuration directory to be used by the server instance. Configuration files and folder structure will be copied to the server instance. Files specified by other server extension properties will take precedence over files located in the configDirectory. The default value is /src/main/liberty/config.	No
defaultVar	Properties	3.0	Inline server variables that are written to the configDropins/defaults/liberty-plugin-variable-config.xml file in the server directory. The property name is used for the variable name, and the property value is used for the variable defaultValue.	No
embedded	boolean	2.7	Whether the server is embedded in the Gradle JVM. If not, the server will run as a separate process. The default value is false. Only used with the libertyStart, libertyRun and libertyStop tasks.	No
env	Properties	3.0	Inline server environment variables that are written to the server.env file in the server directory. These properties take precedence over a specified server.env file.	No
jvmOptions	List	2.0	Inline List of jvm options that is written to the jvm.options file in the server directory. These properties take precedence over a specified jvm.options file.	No
jvmOptionsFile	File	2.0	Location of the file containing JVM options to copy to the jvm.options file in the server instance.	No
looseApplication	boolean	2.0	Indicates to install application using loose application configuration so that war or ear files do not need to be regenerated for every application update. The loose application support for ear files requires Gradle 4.0 or higher. The default is true.	No
mergeServerEnv	boolean	3.1-M1	Merge the server environment properties from all specified sources with the default generated server.env file in the target server. Conflicts are resolved with the same precedence as the replacement policy when this attribute is set to false. The properties specified in the env attribute are highest precedence, followed by the serverEnvFile attribute, then the server.env file located in the configDirectory, and finally the default generated server.env file in the target server. The default value is false.	No
name	String	2.0	The name of the server instance to create. The default value is defaultServer.	No
noPassword	boolean	2.7	Disable generation of the default keystore password by specifying the --no-password option when creating a new server. This option was added in 18.0.0.3. The default value is false. Only used with the libertyCreate task.	No
outputDir	String	1.0	Value of the ${wlp_output_dir} variable. The default value is ${installDir}/usr/servers/${serverName}.	No
serverEnvFile	File	3.0	Location of the file containing server environment variables to copy to the server.env file in the server instance. This replaces the serverEnv property.	No
serverXmlFile	File	3.0	Location of the server.xml file used by the server instance. This replaces the configFile parameter.	No
stripVersion	boolean	2.0	Remove the artifact version when copying the application to Liberty runtime's application directory. The default value is false.	No
template	String	1.0	Name of the template to use when creating a new server. Only used with the libertyCreate task.	No
timeout	String	1.0	Waiting time before the server starts. The default value is 30 seconds. The unit is seconds. Only used with libertyStart and deploy tasks.	No
var	Properties	3.0	Inline server variables that are written to the configDropins/overrides/liberty-plugin-variable-config.xml file in the server directory. The property name is used for the variable name, and the property value is used for the variable value.	No
verifyAppStartTimeout	int	2.0	Wait time for checking message logs for start of all applications installed with the deploy task. Only used with the libertyStart task. Default value is 0 seconds with no verification.	No

If Liberty configuration is specified with Gradle properties for the server extension properties of type Properties, the above indicated files are created in the target Liberty server. By default there is no merging behavior for the Gradle properties with files located in the configDirectory or the specific configuration file parameters such as bootstrapPropertiesFile, jvmOptionsFile and serverEnvFile. However, the liberty.server.env."var" Gradle properties can be merged with other configured server.env files by setting the mergeServerEnv parameter to true.

As a special case when mergeServerEnv is false, an existing keystore_password property in the default generated server.env file in the target server will be merged in if there is no serverEnvFile configured nor server.env file located in the configDirectory, and the keystore_password env var is not defined as a Gradle property.