Modernize dev container with multi-version Java support

.devcontainer/Dockerfile

@@ -1,38 +1,48 @@
-# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.177.0/containers/java/.devcontainer/base.Dockerfile
-
-# [Choice] Java version: 11, 15
-ARG VARIANT="15"
-FROM mcr.microsoft.com/vscode/devcontainers/java:0-${VARIANT}
-
-# [Option] Install Maven
-ARG INSTALL_MAVEN="false"
-ARG MAVEN_VERSION=""
-# [Option] Install Gradle
-ARG INSTALL_GRADLE="false"
-ARG GRADLE_VERSION=""
-RUN if [ "${INSTALL_MAVEN}" = "true" ]; then su vscode -c "umask 0002 && . /usr/local/sdkman/bin/sdkman-init.sh && sdk install maven \"${MAVEN_VERSION}\""; fi \
-    && if [ "${INSTALL_GRADLE}" = "true" ]; then su vscode -c "umask 0002 && . /usr/local/sdkman/bin/sdkman-init.sh && sdk install gradle \"${GRADLE_VERSION}\""; fi
-
-# [Option] Install Node.js
-ARG INSTALL_NODE="true"
-ARG NODE_VERSION="lts/*"
-RUN if [ "${INSTALL_NODE}" = "true" ]; then su vscode -c "umask 0002 && . /usr/local/share/nvm/nvm.sh && nvm install ${NODE_VERSION} 2>&1"; fi
-
-COPY --from=openjdk:8-jdk-buster /usr/local/openjdk-8 /usr/local/openjdk-8
-COPY --from=openjdk:11-jdk-buster /usr/local/openjdk-11 /usr/local/openjdk-11
-COPY --from=openjdk:17-jdk-buster /usr/local/openjdk-17 /usr/local/openjdk-17
-
-ENV JAVA_HOME="/usr/local/openjdk-17"
+FROM mcr.microsoft.com/devcontainers/base:ubuntu-24.04
+
+# Avoid prompts from apt
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install cross-compilers and scientific libraries
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends \
+    build-essential \
+    gcc-aarch64-linux-gnu libc6-dev-arm64-cross \
+    gcc-riscv64-linux-gnu libc6-dev-riscv64-cross \
+    gcc-x86-64-linux-gnu libc6-dev-amd64-cross \
+    libopenblas-dev \
+    liblapack-dev \
+    libarpack2-dev \
+ && rm -rf /var/lib/apt/lists/*
+
+# Install multiple Java versions from Adoptium (Eclipse Temurin)
+RUN bash -eux -o pipefail <<EOF
+    ARCH=\$(dpkg --print-architecture)
+    if [ "\$ARCH" = "amd64" ]; then
+        ADOPTIUM_ARCH=x64;
+    elif [ "\$ARCH" = "arm64" ]; then
+        ADOPTIUM_ARCH=aarch64;
+    else
+        echo "Unsupported architecture: \$ARCH" && exit 1;
+    fi
+    for VERSION in 8 11 17 21 25; do
+        mkdir -p /usr/lib/jvm/temurin-\${VERSION}-jdk-\${ARCH};
+        wget -O - "https://api.adoptium.net/v3/binary/latest/\${VERSION}/ga/linux/\${ADOPTIUM_ARCH}/jdk/hotspot/normal/eclipse?project=jdk" --progress=dot:giga \
+            | tar -xzf - --strip-components=1 -C /usr/lib/jvm/temurin-\${VERSION}-jdk-\${ARCH};
+    done
+EOF
+
+# Set Java 25 as default
+RUN ARCH=$(dpkg --print-architecture) \
+ && ln -sf /usr/lib/jvm/temurin-25-jdk-${ARCH} /usr/lib/jvm/default-java
+ENV JAVA_HOME=/usr/lib/jvm/default-java
 ENV PATH="${JAVA_HOME}/bin:${PATH}"
 
-# [Optional] Uncomment this section to install additional OS packages.
-RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
-    && apt-get -y install \
-        libopenblas-dev libarpack2-dev gdb vim build-essential gcc-x86-64-linux-gnu gcc-aarch64-linux-gnu
-
-RUN git config --global user.email "git@ludovic.dev" \
- && git config --global user.name "Ludovic Henry" \
- && git config --global core.editor "vim"
+# Install Maven
+ARG MAVEN_VERSION=3.9.6
+RUN mkdir -p /opt/apache-maven-${MAVEN_VERSION} \
+ && wget -O - https://archive.apache.org/dist/maven/maven-3/${MAVEN_VERSION}/binaries/apache-maven-${MAVEN_VERSION}-bin.tar.gz --progress=dot:giga \
+        | tar -xzf - --strip-components=1 -C /opt/apache-maven-${MAVEN_VERSION}
 
-# [Optional] Uncomment this line to install global node packages.
-# RUN su vscode -c "source /usr/local/share/nvm/nvm.sh && npm install -g <your-package-here>" 2>&1
+ENV MAVEN_HOME=/opt/apache-maven-${MAVEN_VERSION}
+ENV PATH="${MAVEN_HOME}/bin:${PATH}"

.devcontainer/devcontainer.json

@@ -1,45 +1,44 @@
-// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
-// https://github.com/microsoft/vscode-dev-containers/tree/v0.177.0/containers/java
 {
-	"name": "Java",
-	"build": {
-		"dockerfile": "Dockerfile",
-		"args": {
-			// Update the VARIANT arg to pick a Java version: 11, 15
-			"VARIANT": "11",
-			// Options
-			"INSTALL_MAVEN": "true",
-			"INSTALL_GRADLE": "false",
-			"INSTALL_NODE": "false",
-			"NODE_VERSION": "lts/*"
-		}
-	},
-
-	// Set *default* container specific settings.json values on container create.
-	"settings": { 
-		"terminal.integrated.shell.linux": "/bin/bash",
-		"java.home": "/docker-java-home"
-	},
-
-	// Add the IDs of extensions you want installed when the container is created.
-	"extensions": [
-		"vscjava.vscode-java-pack"
-	],
-
-	// Use 'forwardPorts' to make a list of ports inside the container available locally.
-	// "forwardPorts": [],
-
-	// Use 'postCreateCommand' to run commands after the container is created.
-	// "postCreateCommand": "java -version",
-
-	// Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
-	"remoteUser": "vscode",
-
-	"mounts": [
-		"src=m2,dst=/home/vscode/.m2",
-	],
-
-	"runArgs": [
-		"--privileged",
-	],
+  "name": "Java Multi-Version Development",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "vscjava.vscode-java-pack",
+        "vscjava.vscode-maven",
+        "Anthropic.claude-code",
+        "GitHub.vscode-pull-request-github"
+      ],
+      "settings": {
+        "java.configuration.runtimes": [
+          {
+            "name": "JavaSE-1.8",
+            "path": "/usr/lib/jvm/temurin-8-jdk-${localEnv:HOSTTYPE}"
+          },
+          {
+            "name": "JavaSE-11",
+            "path": "/usr/lib/jvm/temurin-11-jdk-${localEnv:HOSTTYPE}"
+          },
+          {
+            "name": "JavaSE-17",
+            "path": "/usr/lib/jvm/temurin-17-jdk-${localEnv:HOSTTYPE}"
+          },
+          {
+            "name": "JavaSE-21",
+            "path": "/usr/lib/jvm/temurin-21-jdk-${localEnv:HOSTTYPE}"
+          },
+          {
+            "name": "JavaSE-25",
+            "path": "/usr/lib/jvm/temurin-25-jdk-${localEnv:HOSTTYPE}",
+            "default": true
+          }
+        ]
+      }
+    }
+  },
+  "forwardPorts": [],
+  "postCreateCommand": "java -version && mvn -version",
+  "remoteUser": "root"
 }