Package: groovy.lang

## [Java] Annotation Type GrabConfig

- groovy.lang.GrabConfig

-     @Retention(RetentionPolicy.SOURCE)
      @Target({
              ElementType.CONSTRUCTOR,
              ElementType.FIELD,
              ElementType.LOCAL_VARIABLE,
              ElementType.METHOD,
              ElementType.PARAMETER,
              ElementType.TYPE})
      public @interface GrabConfig

  Used to modify the grape configuration for grab requests.

  An example involving databases:

       @Grab('mysql:mysql-connector-java:5.1.6')
       @GrabConfig(systemClassLoader=true)
       import groovy.sql.Sql

       def sql=Sql.newInstance("jdbc:mysql://localhost/test", "user", "password", "com.mysql.jdbc.Driver")
       println sql.firstRow('SELECT * FROM INFORMATION_SCHEMA.COLUMNS')

  Another example involving XStream:

       @Grab('com.thoughtworks.xstream:xstream:1.4.9')
       @Grab('xpp3:xpp3_min:1.1.4c')
       @GrabConfig(systemClassLoader=true, initContextClassLoader=true)
       import com.thoughtworks.xstream.*

       class Staff {
           String firstname, lastname, position

       def xstream = new XStream()
       def john1 = new Staff(firstname:'John',
                            lastname:'Connor',
                            position:'Resistance Leader')

       // write out to XML file
       new File("john.xml").withOutputStream { out ->
           xstream.toXML(john1, out)
       }

       // now read back in
       def john2
       new File("john.xml").withInputStream { ins ->
           john2 = xstream.fromXML(ins)
       }

       println john2.dump()
       }

  Further information about customising grape behavior can be found on the Grape documentation page: http://groovy-lang.org/grape.html.

- - ### Element Summary

    Optional Element Summary
    Type | Name and Description
    --- | ---
    `boolean` | `autoDownload` Set to false if you want to disable automatic downloading of locally missing jars.
    `boolean` | `disableChecksums` Set to true if you want to disable checksum checking.
    `boolean` | `initContextClassLoader` Set to true if you want the context classloader to be initialised to the classloader of the current class or script.
    `boolean` | `systemClassLoader` Set to true if you want to use the system classloader when loading the grape.
    `String[]` | `systemProperties` Define any system properties which must be set before invoking the grab - useful for declaring SSL certificates or proxy settings.

  - ### Inherited Methods Summary

    Inherited Methods
    Methods inherited from class | Name
    --- | ---
    `class Object` | `wait, wait, wait, equals, toString, hashCode, getClass, notify, notifyAll`

- - ### Element Detail

    - #### public boolean autoDownload

      Set to false if you want to disable automatic downloading of locally missing jars.

      Default:
        true

    - #### public boolean disableChecksums

      Set to true if you want to disable checksum checking.

      Default:
        false

    - #### public boolean initContextClassLoader

      Set to true if you want the context classloader to be initialised to the classloader of the current class or script. This is useful for libraries or frameworks that assume that the context classloader has been set. But be careful when using this flag as your script or class might behave differently when called directly (from the command line or from an IDE) versus when called from within a container, e.g. a web container or a JEE container.

      Default:
        false

    - #### public boolean systemClassLoader

      Set to true if you want to use the system classloader when loading the grape. This is normally only required when a core Java class needs to reference the grabbed classes, e.g. for a database driver accessed using DriverManager.

      Default:
        false

    - #### public String[] systemProperties

      Define any system properties which must be set before invoking the grab - useful for declaring SSL certificates or proxy settings. Currently, this only affects the generated class or script. You may need to also set those same properties for the Groovy compiler. For convenience, a String with comma separated name=value pairs can be used in addition to an array (using Groovy's literal list notation) of String name=value items. The single String shorthand form can't be used if value part of a property contains a comma.

      Since:
        2.4.5
      Default:
        ""