Package groovy.lang

Annotation Type Grab

@Retention(SOURCE)
@Target({CONSTRUCTOR,FIELD,LOCAL_VARIABLE,METHOD,PARAMETER,TYPE})
public @interface Grab

Used to grab the referenced artifact and its dependencies and make it available on the Classpath.

Some examples:

 @Grab(group='commons-lang', module='commons-lang', version='2.4')
 import org.apache.commons.lang.WordUtils
 println "Hello ${WordUtils.capitalize('world')}"
 

Or using the compact Gradle-inspired syntax:

 @Grab('commons-lang:commons-lang:2.4')
 import org.apache.commons.lang.WordUtils
 println "Hello ${WordUtils.capitalize('world')}"
 

or the same thing again using the Ivy-inspired syntax variant:

 @Grab('commons-lang#commons-lang;2.4')
 import org.apache.commons.lang.WordUtils
 println "Hello ${WordUtils.capitalize('world')}"
 

Further information such as where artifacts are downloaded to, how to add additional resolvers, how to customise artifact resolution etc., can be found on the Grape documentation page: http://groovy-lang.org/grape.html.

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element	Description
boolean	changing	Defaults to false but set to true if the dependency artifacts may change without a corresponding revision change.
String	classifier	The classifier if in use, e.g.: "jdk14"
String	conf	The configuration if in use (normally only used by internal ivy repositories).
String	ext	The extension of the artifact (normally safe to leave at default value of "jar" but other values like "zip" are sometimes useful).
boolean	force	Defaults to false but set to true to indicate to the underlying Ivy conflict manager that this dependency should be forced to the given revision.
String	group	The organisation or group, e.g.: "org.apache.ant".
boolean	initClass	By default, when a @Grab annotation is used, a Grape.grab() call is added to the static initializers of the class the annotatable node appears in.
String	module	The module or artifact, e.g.: "ant-junit".
boolean	transitive	Defaults to true but set to false if you don't want transitive dependencies also to be downloaded.
String	type	The type of the artifact (normally safe to leave at default value of "jar" but other values like "sources" and "javadoc" are sometimes useful).
String	value	Allows a more compact convenience form in one of two formats with optional appended attributes.
String	version	The revision or version, e.g.: "1.7.1".

Element Details

group

String group

The organisation or group, e.g.: "org.apache.ant". A non-empty value is required unless value() is used.

Default:

""

module

String module

The module or artifact, e.g.: "ant-junit". A non-empty value is required unless value() is used.

Default:

""

version

String version

The revision or version, e.g.: "1.7.1". A non-empty value is required unless value() is used.

Default:

""

classifier

String classifier

The classifier if in use, e.g.: "jdk14"

Default:

""

transitive

boolean transitive

Defaults to true but set to false if you don't want transitive dependencies also to be downloaded. You may then need additional @Grab statements for any required dependencies.

Default:

true

force

boolean force

Defaults to false but set to true to indicate to the underlying Ivy conflict manager that this dependency should be forced to the given revision. Otherwise, depending on the conflict manager in play, a later compatible version might be used instead.

Default:

false

changing

boolean changing

Defaults to false but set to true if the dependency artifacts may change without a corresponding revision change. Not normally recommended but may be useful for certain kinds of snapshot artifacts. May reduce the amount of underlying Ivy caching. Proper behavior may be dependent on the resolver in use.

Default:

false

conf

String conf

The configuration if in use (normally only used by internal ivy repositories). One or more comma separated values with or without square brackets, e.g. for hibernate you might have "default,proxool,oscache" or "[default,dbcp,swarmcache]". This last hibernate example assumes you have set up such configurations in your local Ivy repo and have changed your grape config (using grapeConfig.xml) or the @GrabConfig annotation to point to that repo.

Default:

""

ext

String ext

The extension of the artifact (normally safe to leave at default value of "jar" but other values like "zip" are sometimes useful).

Default:

""

type

String type

The type of the artifact (normally safe to leave at default value of "jar" but other values like "sources" and "javadoc" are sometimes useful). But see also the "classifier" attribute which is also sometimes used for "sources" and "javadoc".

Default:

""

value

String value

Allows a more compact convenience form in one of two formats with optional appended attributes. Must not be used if group(), module() or version() are used.

You can choose either format but not mix-n-match:
group:module:version:classifier@ext (where only group and module are required)
group#module;version[confs] (where only group and module are required and confs, if used, is one or more comma separated configuration names)
In addition, you can add any valid Ivy attributes at the end of your string value using semi-colon separated name = value pairs, e.g.:
@Grab('junit:junit:*;transitive=false')
@Grab('group=junit;module=junit;version=4.8.2;classifier=javadoc')

Default:

""

initClass

boolean initClass

By default, when a @Grab annotation is used, a Grape.grab() call is added to the static initializers of the class the annotatable node appears in. If you wish to disable this, add initClass=false to the annotation.

Default:

true