---
title: Java-SDK - 3.9.0
slug: feature-experimentation/release-notes/java-sdk-3-9-0
docTags: 
createdAt: 2026-08-06T15:30:20.908Z
---

## \[3.9.0]

September 16th, 2021

### New Features

Added new public properties to OptimizelyConfig. [#434](https://github.com/optimizely/java-sdk/pull/434), [#438](https://github.com/optimizely/java-sdk/pull/438)

- sdkKey
- environmentKey
- attributes
- events
- audiences and audiences in OptimizelyExperiment
- experimentRules
- deliveryRules

OptimizelyFeature.experimentsMap of OptimizelyConfig is now deprecated. Please use OptimizelyFeature.experiment\_rules and OptimizelyFeature.delivery\_rules. [#440](https://github.com/optimizely/java-sdk/pull/440)
For more information please refer to Optimizely documentation: [OptimizelyConfig for the Java SDK](docId\:hLecDWvtv-VgcnlgYfelB)

Added custom 'closeableHttpClient' for custom proxy support. [#441](https://github.com/optimizely/java-sdk/pull/441)

[https://github.com/optimizely/java-sdk/releases/tag/3.9.0](https://github.com/optimizely/java-sdk/releases/tag/3.9.0)