# Elastic 6.4.2 Cannot Load Main Class

**URL:** <https://discuss.elastic.co/t/elastic-6-4-2-cannot-load-main-class/151508>\
**Category:** Elasticsearch\
**Created:** [October 8, 2018, 6:31pm UTC](https://discuss.elastic.co/t/elastic-6-4-2-cannot-load-main-class/151508 "2018-10-08T18:31:24Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![questar](https://avatars.discourse-cdn.com/v4/letter/q/9fc29f/32.png) [@questar](https://discuss.elastic.co/u/questar)\
**Post date:** [October 8, 2018, 6:31pm UTC](https://discuss.elastic.co/t/elastic-6-4-2-cannot-load-main-class/151508/1 "2018-10-08T18:31:24Z")

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In porting from 6.4.1 to 6.4.2 (Windows 10, single node, I7 processor with 16 gig), I have run into the following error exceuting the elasticsearch.bat file

Error: Could not find or load main class org.elasticsearch.bootstrap.Elasticsearch

Was initially using Java JDK version 8, 171, so upgraded to JDK 8,181 and also tried Java 10.02. Same result

Current settings are:  
D:\elastic\642\bin\>echo %JAVA\_HOME%  
C:\Program Files\Java\jre1.8.0\_181

```
    java version "1.8.0_181"
    Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
   Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)	

```

I jave not changed the JVM options for the elastic heap allocation.

The elasticsearch.bat file executes correctly on the 6.4.1 version

Thanks

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<div class="post-metadata">

**Author:** ![questar](https://avatars.discourse-cdn.com/v4/letter/q/9fc29f/32.png) [@questar](https://discuss.elastic.co/u/questar)\
**Post date:** [October 9, 2018, 3:33pm UTC](https://discuss.elastic.co/t/elastic-6-4-2-cannot-load-main-class/151508/2 "2018-10-09T15:33:44Z")

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False alarm, the data folder was delete. Of course, I did not do it

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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 6, 2018, 3:33pm UTC](https://discuss.elastic.co/t/elastic-6-4-2-cannot-load-main-class/151508/3 "2018-11-06T15:33:45Z")

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