diff --git a/Dockerfile b/Dockerfile
index f7c1e23..ccd5e34 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,6 +16,7 @@ ARG SPARK_VERSION=3.1.2
 
 RUN sed -i 's|deb.debian.org|mirrors.tuna.tsinghua.edu.cn|g' /etc/apt/sources.list.d/debian.sources && \
     apt-get update && \
+    apt-cache search openjdk && \
     apt-get install -y --no-install-recommends \
         curl \
         ca-certificates \