# How to use painless BigDecimal in java code?

**URL:** <https://discuss.elastic.co/t/how-to-use-painless-bigdecimal-in-java-code/292780>\
**Category:** Elasticsearch\
**Tags:** painless\
**Created:** [December 23, 2021, 8:28am UTC](https://discuss.elastic.co/t/how-to-use-painless-bigdecimal-in-java-code/292780 "2021-12-23T08:28:05Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![xiaozhiliaoo](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/xiaozhiliaoo/32/94175_2.png) [@xiaozhiliaoo](https://discuss.elastic.co/u/xiaozhiliaoo)\
**Post date:** [December 23, 2021, 8:28am UTC](https://discuss.elastic.co/t/how-to-use-painless-bigdecimal-in-java-code/292780/1 "2021-12-23T08:28:05Z")

</div>

I use painless to update doc. how to use BigDecimal to finish it ? Using Elasticsearch 6.8.1.  
[Script JavaDoc](https://javadoc.io/doc/org.elasticsearch/elasticsearch/6.8.10/org/elasticsearch/script/Script.html)  
Script construtor is:

```auto
public Script (ScriptType type,
              java.lang.String lang,
              java.lang.String idOrCode,
              java.util.Map<java.lang.String, java.lang.Object> params)

```

My Code is:

```auto
StringBuilder script = new StringBuilder();
Map<String, Object> params = new HashMap<>();
params.put("poundageRate", poundageRate.doubleValue());
script.append("ctx._source.poundage=ctx._source.amount*params.poundageRate;");
Script scriptObj = new Script(INLINE, DEFAULT_SCRIPT_LANG, script.toString(), params);

```

My Question is:  
How to let **ctx.\_source.amount\*params.poundageRate** using BigDecimal method  
multiply and setScale

```auto
new BigDecimal("ctx._source.amount").multiply(new BigDecimal("params.poundageRate")).setScale(2, HALF_UP).stripTrailingZeros()

```

Thanks a lot i will appreciate it

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<div class="post-metadata">

**Author:** ![xiaozhiliaoo](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/xiaozhiliaoo/32/94175_2.png) [@xiaozhiliaoo](https://discuss.elastic.co/u/xiaozhiliaoo)\
**Post date:** [December 24, 2021, 6:20am UTC](https://discuss.elastic.co/t/how-to-use-painless-bigdecimal-in-java-code/292780/2 "2021-12-24T06:20:58Z")

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I had solved this problem. reference: [How to use elasticsearch painless BigDecimal in java code? - Stack Overflow](https://stackoverflow.com/questions/70459540/how-to-use-elasticsearch-painless-bigdecimal-in-java-code/)

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 21, 2022, 6:21am UTC](https://discuss.elastic.co/t/how-to-use-painless-bigdecimal-in-java-code/292780/3 "2022-01-21T06:21:09Z")

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