# Extract Exception Class

**URL:** https://discuss.elastic.co/t/extract-exception-class/346046
**Category:** Elasticsearch
**Created:** [October 30, 2023, 2:21pm UTC](https://discuss.elastic.co/t/extract-exception-class/346046 "2023-10-30T14:21:54Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![hta](https://avatars.discourse-cdn.com/v4/letter/h/a8b319/32.png) [@hta](https://discuss.elastic.co/u/hta)
#### Post date: [October 30, 2023, 2:21pm UTC](https://discuss.elastic.co/t/extract-exception-class/346046/1 "2023-10-30T14:21:54Z")

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Hello, what is the best way to extract the exception from the following log? I only need the exception class NullpointerException e.g.

My attempt:  
%{TIMESTAMP\_ISO8601:log\_timestamp}._%{LOGLEVEL:log\_level}._[%{GREEDYDATA:log\_javaclass].\*Exception

Log:  
2022-10-22 01:19:55,777 ERROR [org.xxx.xxx.test] (xxxxxClass) TTTT/XXXX-01030 Exception while xxx xxx xxx xxxxx.: aaa.bbb.ccc.ddd.impl.NullpointerException: some Stacktrace 'xyzJavaClass'

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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: [November 27, 2023, 2:22pm UTC](https://discuss.elastic.co/t/extract-exception-class/346046/2 "2023-11-27T14:22:21Z")

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