# Can't use method ensureCapacity for ArrayList

**URL:** <https://discuss.elastic.co/t/cant-use-method-ensurecapacity-for-arraylist/295695>\
**Category:** Elasticsearch\
**Tags:** painless\
**Created:** [January 28, 2022, 11:44am UTC](https://discuss.elastic.co/t/cant-use-method-ensurecapacity-for-arraylist/295695 "2022-01-28T11:44:01Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![arnautov\_evgeny](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/arnautov_evgeny/32/101014_2.png) [@arnautov\_evgeny](https://discuss.elastic.co/u/arnautov_evgeny)\
**Post date:** [January 28, 2022, 11:44am UTC](https://discuss.elastic.co/t/cant-use-method-ensurecapacity-for-arraylist/295695/1 "2022-01-28T11:44:01Z")

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Hello. I'm using a script on painless language, and I can't get it working with the ArrayList object.  
Even example from docs isn't working for me. I've tested it on 7.13.2 and 7.16.3. Thanks in advance for your answer.

 ![msedge_DETNKZFr4z](https://us1.discourse-cdn.com/elastic/original/3X/d/8/d850fb96fe135d54eefb27998241f1afa213fa0f.png)

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**Author:** ![aaron-nimocks](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/aaron-nimocks/32/73965_2.png) [@aaron-nimocks](https://discuss.elastic.co/u/aaron-nimocks)\
**Post date:** [January 29, 2022, 12:44pm UTC](https://discuss.elastic.co/t/cant-use-method-ensurecapacity-for-arraylist/295695/2 "2022-01-29T12:44:03Z")

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You can see what methods are available in the documentation. It doesn't look like `ensurecapacity` is an available method for [java.util.arraylist](https://www.elastic.co/guide/en/elasticsearch/painless/current/painless-api-reference-shared-java-util.html#painless-api-reference-shared-ArrayList).

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**Author:** ![arnautov\_evgeny](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/arnautov_evgeny/32/101014_2.png) [@arnautov\_evgeny](https://discuss.elastic.co/u/arnautov_evgeny)\
**Post date:** [January 29, 2022, 2:00pm UTC](https://discuss.elastic.co/t/cant-use-method-ensurecapacity-for-arraylist/295695/4 "2022-01-29T14:00:18Z")

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Thanks a lot, Aaron! I've found usage of this method on the [painless types page](https://www.elastic.co/guide/en/elasticsearch/painless/7.13/painless-types.html)

 ![msedge_EiEieFHCvd](https://us1.discourse-cdn.com/elastic/original/3X/5/3/53280cb192d79326331fa85584bbe5d56c4b9325.png)  
. I am sharing a screenshot where I've highlighted it for you.

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<div class="post-metadata">

**Author:** ![aaron-nimocks](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/aaron-nimocks/32/73965_2.png) [@aaron-nimocks](https://discuss.elastic.co/u/aaron-nimocks)\
**Post date:** [January 29, 2022, 3:08pm UTC](https://discuss.elastic.co/t/cant-use-method-ensurecapacity-for-arraylist/295695/5 "2022-01-29T15:08:28Z")

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Maybe a developer could weigh in but it doesn't look like a supported method to me so not sure why it's in the documentation. Believe it might have in older versions.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [February 26, 2022, 3:09pm UTC](https://discuss.elastic.co/t/cant-use-method-ensurecapacity-for-arraylist/295695/6 "2022-02-26T15:09:04Z")

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