How to build Java libraries/binaries?

I've been experimenting with buck2 but I've been struggling to find any information on building Java. A simple java_library rule fails to build
```
java_library(
name = 'main',
srcs = ['Main.java'],
)
```
```
Error running analysis for `root//:main (prelude//platforms:default#524f8da68ea2a374)`

Caused by:
0: Error looking up configured node root//:main (prelude//platforms:default#524f8da68ea2a374)
1: Error getting configuration node of `prelude//runtime/constraints:android-host-test` within the `prelude//platforms:default#524f8da68ea2a374` configuration
2: Error running analysis for `prelude//runtime/constraints:android-host-test ()`
3: Error looking up configured node prelude//runtime/constraints:android-host-test ()
4: looking up unconfigured target node `prelude//runtime/constraints:android-host-test`
5: Error loading targets in package `prelude//runtime/constraints` for target `prelude//runtime/constraints:android-host-test`
6: Error gathering package listing for `prelude//runtime/constraints`
7: The package is invalid
8: This error was caused by the end user
9: Error listing dir `prelude//runtime/constraints`
10: Error listing directory
11: read_dir(/tmp/buck2test/prelude/runtime/constraints)
12: No such file or directory (os error 2)
Build ID: fedd29e4-2e88-42b8-aa74-d133c81e21db
Jobs completed: 46. Time elapsed: 0.1s.
BUILD FAILED
```
I'm not 100% sure what this error is caused by, I assume I need to configure a java toolchain, but I can't find anything to reference on how to do this. Is there documentation on this or projects to reference?