diff --git a/__ffi/robusta_jni/justfile b/__ffi/robusta_jni/justfile
index e1e1215..08b5d48 100644
--- a/__ffi/robusta_jni/justfile
+++ b/__ffi/robusta_jni/justfile
@@ -5,4 +5,4 @@ build:
   cargo build
 
 java_run: build
-  javac com/example/robusta/HelloWorld.java && RUST_BACKTRACE=full java -Djava.library.path=../target/debug com.example.robusta.HelloWorld
+  buildj :::javac15 com/example/robusta/HelloWorld.java && RUST_BACKTRACE=full buildj :::java15 -Djava.library.path=./target/debug com.example.robusta.HelloWorld