restore original jdk21 preview Dockerfile

debian/preview/Dockerfile

@@ -1,20 +1,17 @@
 ARG DEBIAN_RELEASE=bookworm-20240423
 FROM debian:"${DEBIAN_RELEASE}"-slim as jre-build
+ARG JAVA_VERSION
+ARG TARGETPLATFORM
 
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
-# This Build ARG is populated by Docker
-# Ref. https://docs.docker.com/engine/reference/builder/#automatic-platform-args-in-the-global-scope
-ARG TARGETPLATFORM
-
 ## Example of preview (EA) jdk21 JAVA_VERSION values:
 # 21+35 (note: only one number before the "+")
 # 21.0.1+12
 ## Example of preview (EA) release download link:
 # https://github.com/adoptium/temurin21-binaries/releases/download/jdk-21%2B35-ea-beta/OpenJDK21U-jdk_x64_linux_hotspot_ea_21-0-35.tar.gz
 # https://github.com/adoptium/temurin21-binaries/releases/download/jdk-21.0.1%2B12-ea-beta/OpenJDK21U-jdk_x64_alpine-linux_hotspot_ea_21-0-1-12.tar.gz
 
-ARG JAVA_VERSION
 # hadolint ignore=DL3008
 RUN set -x; apt-get update \
   && apt-get install --no-install-recommends -y \
@@ -29,27 +26,19 @@ RUN set -x; apt-get update \
   && tar -xzf /tmp/jdk.tar.gz -C /opt/ \
   && rm -f /tmp/jdk.tar.gz
 
-ENV PATH="/opt/jdk-${JAVA_VERSION}/bin:${PATH}"
-
-RUN if [[ "${TARGETPLATFORM}" != "linux/arm/v7" ]]; then \
-    case "$(jlink --version 2>&1)" in \
-      # jlink version 11 has less features than JDK17+
-      "11."*) set -- "--strip-debug" "--compress=2" ;; \
-      "17."*) set -- "--strip-java-debug-attributes" "--compress=2" ;; \
-      # the compression argument is different for JDK21
-      "21."*) set -- "--strip-java-debug-attributes" "--compress=zip-6" ;; \
-      *) echo "ERROR: unmanaged jlink version pattern" && exit 1 ;; \
-    esac; \
-    jlink \
-      "$1" \
-      "$2" \
-      --add-modules ALL-MODULE-PATH \
-      --no-man-pages \
-      --no-header-files \
-      --output /javaruntime; \
-  else \
-    cp -r "/opt/jdk-${JAVA_VERSION}" /javaruntime; \
-  fi
+ENV PATH=/opt/jdk-${JAVA_VERSION}/bin:$PATH
+
+RUN if test "${TARGETPLATFORM}" != 'linux/arm/v7'; then \
+      jlink \
+        --add-modules ALL-MODULE-PATH \
+        --no-man-pages \
+        --compress=zip-6 \
+        --output /javaruntime; \
+    # It is acceptable to have a larger image in arm/v7 (arm 32 bits) environment.
+    # Because jlink fails with the error "jmods: Value too large for defined data type" error.
+    else  \
+      cp -r "/opt/jdk-${JAVA_VERSION}" /javaruntime; \
+    fi
 
 ## Agent image target
 FROM debian:"${DEBIAN_RELEASE}" AS agent

docker-bake.hcl

@@ -121,7 +121,7 @@ variable "JAVA21_VERSION" {
 }
 
 variable "JAVA21_PREVIEW_VERSION" {
-  default = "21.0.1_12"
+  default = "21.0.1+12"
 }
 
 function "orgrepo" {