Update Dockerfile

Dockerfile

@@ -1,4 +1,4 @@
-FROM openjdk:17-jdk-slim
+FROM openjdk:21-jdk-slim
 
 ENV DEBIAN_FRONTEND=noninteractive
 
@@ -17,19 +17,11 @@ WORKDIR /server
 # Fetch the latest release version, then download its server.jar (robust method)
 RUN set -eux; \
     MANIFEST_URL="https://piston-meta.mojang.com/mc/game/version_manifest_v2.json"; \
-    echo "Fetching manifest..."; \
     MANIFEST_JSON="$(curl -sS "${MANIFEST_URL}")"; \
-    if [ -z "${MANIFEST_JSON}" ]; then echo "ERROR: could not fetch manifest" >&2; exit 1; fi; \
     LATEST_VER="$(printf '%s' "${MANIFEST_JSON}" | jq -r '.latest.release')"; \
-    echo "Latest release: ${LATEST_VER}"; \
-    if [ -z "${LATEST_VER}" ] || [ "${LATEST_VER}" = "null" ]; then echo "ERROR: latest.release not found" >&2; exit 1; fi; \
     VERSION_URL="$(printf '%s' "${MANIFEST_JSON}" | jq -r --arg v "${LATEST_VER}" '.versions[] | select(.id==$v) | .url')"; \
-    echo "Version metadata URL: ${VERSION_URL}"; \
-    if [ -z "${VERSION_URL}" ] || [ "${VERSION_URL}" = "null" ]; then echo "ERROR: version URL not found for ${LATEST_VER}" >&2; exit 1; fi; \
     curl -sSf "${VERSION_URL}" -o version.json; \
     SERVER_JAR_URL="$(jq -r '.downloads.server.url' version.json)"; \
-    echo "Server JAR URL: ${SERVER_JAR_URL}"; \
-    if [ -z "${SERVER_JAR_URL}" ] || [ "${SERVER_JAR_URL}" = "null" ]; then echo "ERROR: server jar url missing in version.json" >&2; exit 1; fi; \
     wget -O server.jar "${SERVER_JAR_URL}"; \
     rm -f version.json