# Debugging Kyuubi
You can use the [Java Debug Wire Protocol](https://docs.oracle.com/javase/8/docs/technotes/guides/jpda/conninv.html#Plugin) to debug Kyuubi
w/ your favorite IDE tool, e.g. Intellij IDEA.
## Debugging Server
We can configure the JDWP agent in `KYUUBI_JAVA_OPTS` for debugging.
For example,
```bash
KYUUBI_JAVA_OPTS=-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 \
bin/kyuubi start
```
In the IDE, you set the corresponding parameters(host&port) in debug configurations, for example,
## Debugging Apps
- Spark Driver
```bash
spark.driver.extraJavaOptions -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005
```
- Spark Executor
```bash
spark.executor.extraJavaOptions -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005
```