# 🔍 Description
## Issue References 🔗
This is a follow-up of #5987, after applying #5987, I found a regression, the Kyuubi Server Java process can not see KYUUBI_HOME env if we don't declare KYUUBI_HOME as an env var explicitly, this breaks the main resources jar discovery of the engine, and eventually fails the engine bootstrap.
## Describe Your Solution 🔧
Restore `export KYUUBI_HOME` logic in `load-kyuubi-env.sh`
## Types of changes 🔖
- [x] Bugfix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to change)
## Test Plan 🧪
Build and start Kyuubi Server.
```
export SPARK_HOME=/Users/chengpan/app/spark-3.5.0-bin-hadoop3
build/dist --spark-provided --flink-provided --hive-provided
dist/bin/kyuubi run
```
Open session to launch a Spark engine
```
dist/bin/beeline -u 'jdbc:hive2://0.0.0.0:10009/default'
```
#### Behavior Without This Pull Request ⚰️
A wrong `kyuubi-spark-sql-engine_2.12-1.9.0-SNAPSHOT.jar` location was found.
```
/Users/chengpan/app/spark-3.5.0-bin-hadoop3/bin/spark-submit \
...
--proxy-user chengpan /Users/chengpan/Projects/apache-kyuubi/dist/jars/externals/kyuubi-spark-sql-engine/target/kyuubi-spark-sql-engine_2.12-1.9.0-SNAPSHOT.jar
```
#### Behavior With This Pull Request 🎉
The correct `kyuubi-spark-sql-engine_2.12-1.9.0-SNAPSHOT.jar` location was found.
```
/Users/chengpan/app/spark-3.5.0-bin-hadoop3/bin/spark-submit \
...
--proxy-user chengpan /Users/chengpan/Projects/apache-kyuubi/dist/externals/engines/spark/kyuubi-spark-sql-engine_2.12-1.9.0-SNAPSHOT.jar
```
---
# Checklist 📝
- [x] This patch was not authored or co-authored using [Generative Tooling](https://www.apache.org/legal/generative-tooling.html)
**Be nice. Be informative.**
Closes#6004 from pan3793/5987-followup.
Closes#5987
a4e40b687 [Cheng Pan] [KYUUBI #5987] Always export KYUUBI_HOME in load-kyuubi-env.sh
Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: Cheng Pan <chengpan@apache.org>
ac388d191d