diff --git a/infer/lib/python/inferlib/bucklib.py b/infer/lib/python/inferlib/bucklib.py
index 9295d0abf..e11d5e0d5 100644
--- a/infer/lib/python/inferlib/bucklib.py
+++ b/infer/lib/python/inferlib/bucklib.py
@@ -443,6 +443,11 @@ class Wrapper:
 
     def __init__(self, infer_args, buck_cmd):
         self.timer = utils.Timer(logging.info)
+        # The reactive mode is not yet supported
+        if infer_args.reactive:
+            sys.stderr.write(
+                'Reactive is not supported for Java Buck project. Exiting.\n')
+            sys.exit(1)
         self.infer_args = infer_args
         self.timer.start('Computing library targets')
         base_cmd, buck_args = parse_buck_command(buck_cmd)