diff --git a/.gitignore b/.gitignore
index 20a9f60924..fdc9d2b163 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,3 +46,6 @@ utils/tls_crts/
 # OSS Review Toolkit (ORT) files
 **/ort*/**
 **/ort_results/**
+
+# java compiled files.
+*.class