# Logstash ERROR: (NameError) cannot initialize Java class org.logstash.plugins.AliasRegistry (java.lang.ExceptionInInitializerError)

**URL:** <https://discuss.elastic.co/t/logstash-error-nameerror-cannot-initialize-java-class-org-logstash-plugins-aliasregistry-java-lang-exceptionininitializererror/375965>\
**Category:** Logstash\
**Created:** [March 15, 2025, 9:13am UTC](https://discuss.elastic.co/t/logstash-error-nameerror-cannot-initialize-java-class-org-logstash-plugins-aliasregistry-java-lang-exceptionininitializererror/375965 "2025-03-15T09:13:25Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![horemheb](https://avatars.discourse-cdn.com/v4/letter/h/e0b2c6/32.png) [@horemheb](https://discuss.elastic.co/u/horemheb)\
**Post date:** [March 15, 2025, 9:13am UTC](https://discuss.elastic.co/t/logstash-error-nameerror-cannot-initialize-java-class-org-logstash-plugins-aliasregistry-java-lang-exceptionininitializererror/375965/1 "2025-03-15T09:13:25Z")

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# [Logstash ERROR: (NameError) cannot initialize Java class org.logstash.plugins.AliasRegistry (java.lang.ExceptionInInitializerError)](https://discuss.elastic.co/t/logstash-error-nameerror-cannot-initialize-java-class-org-logstash-plugins-aliasregistry-java-lang-exceptionininitializererror/355350)

For this exception on windows machines I'd changed jvm.options file for parameters

```auto
#-Duser.language=en -> -Duser.language=en
#-Duser.country=US -> -Duser.country=US
and assign proper value for ENV['TZ'] if not set. 

(https://discuss.elastic.co/u/abdulberk/)
```