diff --git a/README.md b/README.md
index 504808c9..ce03045d 100644
--- a/README.md
+++ b/README.md
@@ -714,6 +714,10 @@ You may also download or copy over individual mods using the `MODS` environment
 
   docker run -d -e MODS=https://www.example.com/mods/mod1.jar,/plugins/common,/plugins/special/mod2.jar ...
 
+### Generic pack file
+
+To install all of the server content (jars, mods, plugins, configs, etc) from a zip file, such as a CurseForge modpack that is missing a server start script, then set `GENERIC_PACK` to the container path of the zip file. That, combined with `TYPE`, allows for custom content along with container managed server download and install.  
+
 ### Mod/Plugin URL Listing File 
 
 As an alternative to `MODS`, the variable `MODS_FILE` can be set with the path to a text file listing a mod/plugin URL on each line. For example, the following
diff --git a/examples/docker-compose-curseforge.yml b/examples/docker-compose-curseforge.yml
index a3b885d5..55f6e1ee 100644
--- a/examples/docker-compose-curseforge.yml
+++ b/examples/docker-compose-curseforge.yml
@@ -2,12 +2,12 @@ version: '3.8'
 
 services:
   mc:
-    image: itzg/minecraft-server:java8
+    image: itzg/minecraft-server:${IMAGE_TAG:-java8}
     volumes:
     - ./modpacks:/modpacks:ro
     environment:
       EULA: "true"
       TYPE: CURSEFORGE
-      CF_SERVER_MOD: /modpacks/SkyFactory_4_Server_4.1.0.zip
+      CF_SERVER_MOD: /modpacks/${MODPACK:-SkyFactory_4_Server_4.1.0.zip}
     ports:
-      - 25565:25565
+      - "25565:25565"
diff --git a/examples/docker-compose-generic-pack.yml b/examples/docker-compose-generic-pack.yml
new file mode 100644
index 00000000..314a8083
--- /dev/null
+++ b/examples/docker-compose-generic-pack.yml
@@ -0,0 +1,20 @@
+version: '3.8'
+
+services:
+  mc:
+    image: itzg/minecraft-server:${IMAGE_TAG:-latest}
+    volumes:
+    - data:/data
+    - ./modpacks:/modpacks:ro
+    environment:
+      EULA: "true"
+      TYPE: FORGE
+      DEBUG: "${DEBUG:-false}"
+      VERSION: ${VERSION:-1.17.1}
+      FORGEVERSION: ${FORGEVERSION:-37.0.90}
+      GENERIC_PACK: /modpacks/${MODPACK:-Server-Files-0.0.21.zip}
+    ports:
+      - "25565:25565"
+
+volumes:
+  data: {}
\ No newline at end of file
diff --git a/start-configuration b/start-configuration
index c07422d8..faa0b0a3 100755
--- a/start-configuration
+++ b/start-configuration
@@ -124,10 +124,8 @@ case "${TYPE^^}" in
 
   FTB|CURSEFORGE)
     log "**********************************************************************"
-    log "WARNING: The image tag itzg/minecraft-server:java8 is recommended"
-    log "         since some mods require Java 8"
-    log "         Exception traces reporting ClassCastException: class jdk.internal.loader.ClassLoaders\$AppClassLoader"
-    log "         can be fixed with java8"
+    log "NOTE: Some mods and modpacks may require Java 8."
+    log "      If so, use itzg/minecraft-server:java8"
     log "**********************************************************************"
     exec ${SCRIPTS:-/}start-deployCF "$@"
   ;;
diff --git a/start-deployCF b/start-deployCF
index d821636a..e7a7f42e 100755
--- a/start-deployCF
+++ b/start-deployCF
@@ -92,7 +92,7 @@ if ! isTrue ${USE_MODPACK_START_SCRIPT:-true}; then
     echo "${FTB_SERVER_MOD}" > $installMarker
   fi
 
-  export SERVER=$(find ${FTB_BASE_DIR} -type f \( -path "/libraries/*" -o -path "/mods/*" \) -prune -o -name "forge*.jar" -not -name "forge*installer.jar" -maxdepth 2 -print)
+  export SERVER=$(find "${FTB_BASE_DIR}" -maxdepth 2 -type f \( -path "/libraries/*" -o -path "/mods/*" \) -prune -o -name "forge*.jar" -not -name "forge*installer.jar" -print)
   if [[ -z "${SERVER}" || ! -f "${SERVER}" ]]; then
     log "ERROR unable to locate installed forge server jar"
     isDebugging && find ${FTB_BASE_DIR} -name "forge*.jar"
@@ -185,7 +185,7 @@ if [[ $(find ${FTB_BASE_DIR} $entryScriptExpr | wc -l) = 0 ]]; then
 
     # Allow up to 2 levels since some modpacks have a top-level directory named
     # for the modpack
-    forgeJar=$(find ${FTB_BASE_DIR} -type f \( -path "/libraries/*" -o -path "/mods/*" \) -prune -o -name "forge*.jar" -not -name "forge*installer.jar" -maxdepth 2 -print)
+    forgeJar=$(find "${FTB_BASE_DIR}" -maxdepth 2 -type f \( -path "/libraries/*" -o -path "/mods/*" \) -prune -o -name "forge*.jar" -not -name "forge*installer.jar" -print)
     if [[ "$forgeJar" ]]; then
       export FTB_BASE_DIR=$(dirname "${forgeJar}")
       log "No entry script found, so building one for ${forgeJar}"
diff --git a/start-deployForge b/start-deployForge
index 394c6050..088f4a6e 100755
--- a/start-deployForge
+++ b/start-deployForge
@@ -53,13 +53,19 @@ install() {
   # NOTE $shortForgeVersion will be empty if installer location was given to us
   log "Finding installed server jar..."
   unset -v latest
-  for file in *forge*.jar; do
-    if ! [[ $file =~ installer ]]; then
-      if [[ -z $latest ]] || [[ $file -nt $latest ]]; then
-        latest=$file
+  # 1.17+ ?
+  if [ -f /data/run.sh ]; then
+    latest=/data/run.sh
+  # else pre 1.17
+  else
+    for file in *forge*.jar; do
+      if ! [[ $file =~ installer ]]; then
+        if [[ -z $latest ]] || [[ $file -nt $latest ]]; then
+          latest=$file
+        fi
       fi
-    fi
-  done
+    done
+  fi
   if [[ -z $latest ]]; then
     log "Unable to derive server jar for Forge"
     exit 2
@@ -67,6 +73,7 @@ install() {
 
   export SERVER=$latest
   log "Using server $SERVER"
+  debug "Writing install marker at $installMarker"
   echo "$SERVER" > "$installMarker"
 }
 
@@ -134,10 +141,10 @@ if [ ! -e "$installMarker" ]; then
 else
   SERVER=$(cat "$installMarker")
   export SERVER
-  if [ ! -e "$SERVER" ] && versionLessThan 1.17; then
+  if [ ! -e "$SERVER" ]; then
     rm "$installMarker"
     install
   fi
 fi
 
-exec "${SCRIPTS:-$(dirname "$0")}/start-setupWorld" "$@"
+exec "${SCRIPTS:-/}start-setupWorld" "$@"
diff --git a/start-setupModpack b/start-setupModpack
index 474dc7c7..3d4f13be 100755
--- a/start-setupModpack
+++ b/start-setupModpack
@@ -169,29 +169,38 @@ if [[ "${GENERIC_PACK}" ]]; then
   fi
 
   sum_file=/data/.generic_pack.sum
-  if ! sha256sum -c ${sum_file} -s 2> /dev/null; then
+  isDebugging && [ -f "$sum_file}" ] && cat "$sum_file"
+  if ! sha256sum -c "${sum_file}" --status 2> /dev/null; then
     base_dir=/tmp/generic_pack_base
     mkdir -p ${base_dir}
     isDebugging && ls -l "${GENERIC_PACK}"
     unzip -q -d ${base_dir} "${GENERIC_PACK}"
+
+    # recalculate the actual base directory of content
+    base_dir=$(find "$base_dir" -type d \( -name mods -o -name plugins -o -name config \) -printf '%h' -quit)
+    if [[ ! $base_dir ]]; then
+      log "Unable to find content base of generic pack ${GENERIC_PACK}"
+      exit 1
+    fi
+
     if [ -f /data/manifest.txt ]; then
       log "Manifest exists from older generic pack, cleaning up ..."
-      while read f; do
+      while read -r f; do
         rm -rf "/data/${f}"
       done < /data/manifest.txt
-      find /data/* -type d -exec rmdir --ignore-fail-on-non-empty {} +
+      # prune empty dirs
+      find /data -mindepth 1 -depth -type d -empty -delete
       rm -f /data/manifest.txt
     fi
+
     log "Writing generic pack manifest ... "
-    find ${base_dir} -type f -print0 | xargs -0 -I {} echo "{}" | sed "s#${base_dir}/##" > /data/manifest.txt
+    find "${base_dir}" -type f -printf "%P\n" > /data/manifest.txt
+
     log "Applying generic pack ..."
-    IFS='
-'
-    set -f
-    for d in $(find ${base_dir} -type d); do mkdir -p "$(sed "s#${base_dir}#/data#" <<< $d)"; done
-    for f in $(find ${base_dir} -type f); do cp -f "$f" "$(sed "s#${base_dir}#/data#" <<< $f)"; done
-    rm -rf ${base_dir}
-    sha256sum "${GENERIC_PACK}" > ${sum_file}
+    cp -R -f "${base_dir}"/* /data
+    rm -rf /tmp/generic_pack_base
+    sha256sum "${GENERIC_PACK}" > "${sum_file}"
+    isDebugging && cat "$sum_file"
   fi
 fi