diff --git a/Dockerfile b/Dockerfile
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+FROM ubuntu:20.04
+
+ENV JAVA_HOME /opt/java/openjdk
+ENV PATH $JAVA_HOME/bin:$PATH
+
+# Default to UTF-8 file.encoding
+ENV LANG='en_US.UTF-8' LANGUAGE='en_US:en' LC_ALL='en_US.UTF-8'
+
+RUN apt-get update \
+    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends tzdata curl wget ca-certificates fontconfig locales binutils \
+    && echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen \
+    && locale-gen en_US.UTF-8 \
+    && rm -rf /var/lib/apt/lists/*
+
+ENV JAVA_VERSION jdk-20.0.1+9
+
+RUN set -eux; \
+    ARCH="$(dpkg --print-architecture)"; \
+    case "${ARCH}" in \
+       aarch64|arm64) \
+         ESUM='b16c0271899de1f0e277dc0398bfff11b54511765f104fa938929ac484dc926d'; \
+         BINARY_URL='https://github.com/adoptium/temurin20-binaries/releases/download/jdk-20.0.1%2B9/OpenJDK20U-jdk_aarch64_linux_hotspot_20.0.1_9.tar.gz'; \
+         ;; \
+       amd64|i386:x86-64) \
+         ESUM='43ad054f135a7894dc87ad5d10ad45d8e82846186515892acdbc17c2c5cd27e4'; \
+         BINARY_URL='https://github.com/adoptium/temurin20-binaries/releases/download/jdk-20.0.1%2B9/OpenJDK20U-jdk_x64_linux_hotspot_20.0.1_9.tar.gz'; \
+         ;; \
+       *) \
+         echo "Unsupported arch: ${ARCH}"; \
+         exit 1; \
+         ;; \
+    esac; \
+	  wget -O /tmp/openjdk.tar.gz ${BINARY_URL}; \
+	  echo "${ESUM} */tmp/openjdk.tar.gz" | sha256sum -c -; \
+	  mkdir -p "$JAVA_HOME"; \
+	  tar --extract \
+	      --file /tmp/openjdk.tar.gz \
+	      --directory "$JAVA_HOME" \
+	      --strip-components 1 \
+	      --no-same-owner \
+	  ; \
+    rm -f /tmp/openjdk.tar.gz ${JAVA_HOME}/src.zip; \
+# https://github.com/docker-library/openjdk/issues/331#issuecomment-498834472
+    find "$JAVA_HOME/lib" -name '*.so' -exec dirname '{}' ';' | sort -u > /etc/ld.so.conf.d/docker-openjdk.conf; \
+    ldconfig; \
+# https://github.com/docker-library/openjdk/issues/212#issuecomment-420979840
+# https://openjdk.java.net/jeps/341
+    java -Xshare:dump;
+
+RUN echo Verifying install ... \
+    && fileEncoding="$(echo 'System.out.println(System.getProperty("file.encoding"))' | jshell -s -)"; [ "$fileEncoding" = 'UTF-8' ]; rm -rf ~/.java \
+    && echo javac --version && javac --version \
+    && echo java --version && java --version \
+    && echo Complete.
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