diff --git a/gitea-runner/Java17Dockerfile b/gitea-runner/Java17Dockerfile
index be33f0e..db5c505 100644
--- a/gitea-runner/Java17Dockerfile
+++ b/gitea-runner/Java17Dockerfile
@@ -1,7 +1,12 @@
 FROM docker:stable
 
 # Install packages
-RUN apk add --no-cache curl wget git
+RUN apk add curl wget git
 
 # Install Java 17
-RUN apk add --no-cache openjdk17-jre
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+RUN apk add java-cacerts
+
+ENV JAVA_HOME=/opt/openjdk-17
+ENV PATH=/opt/openjdk-17/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+ENV JAVA_VERSION=17-ea+14
+RUN /bin/sh -c set -eux; arch="$(apk --print-arch)"; case "$arch" in 'x86_64') downloadUrl='https://download.java.net/java/early_access/alpine/14/binaries/openjdk-17-ea+14_linux-x64-musl_bin.tar.gz'; downloadSha256='f07a1ac921333dafac1cd886ad49600ce143be7efebd32e1a02599a8a0829dd4'; ;; *) echo >&2 "error: unsupported architecture: '$arch'"; exit 1 ;; esac; wget -O openjdk.tgz "$downloadUrl"; echo "$downloadSha256 *openjdk.tgz" | sha256sum -c -; mkdir -p "$JAVA_HOME"; tar --extract --file openjdk.tgz --directory "$JAVA_HOME" --strip-components 1 --no-same-owner ; rm openjdk.tgz*; rm -rf "$JAVA_HOME/lib/security/cacerts"; ln -sT /etc/ssl/certs/java/cacerts "$JAVA_HOME/lib/security/cacerts"; java -Xshare:dump; fileEncoding="$(echo 'System.out.println(System.getProperty("file.encoding"))' | jshell -s -)"; [ "$fileEncoding" = 'UTF-8' ]; rm -rf ~/.java; javac --version; java --version
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