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+#!/usr/bin/env bash
+############################################LICENSE#################################################
+# Copyright (C) 2025 Griefed
+#
+# This script is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
+# USA
+#
+# The full license can be found at https:github.com/Griefed/ServerPackCreator/blob/main/LICENSE
+############################################DESCRIPTION#################################################
+#
+# This script uses Jabba to download and install Java with the version required by the Minecraft version set in the
+# variables.txt which was also shipped with this modpack. Should you want to use a different Java version with your
+# server pack, change the RECOMMENDED_JAVA_VERSION. Likewise, you can change the vendor of the JDK to another one by
+# changing JDK_VENDOR in your variables.txt
+#
+# Depending on which Minecraft version is used in this server pack, a different Java version may be installed.
+#
+# A list of available JDK versions and vendors can be found at https://github.com/Jabba-Team/index/blob/main/index.json
+# Jabba is available at https://github.com/Jabba-Team/jabba
+#
+############################################NOTES#################################################
+# Java Install script generated by ServerPackCreator 8.1.1.
+# The template which was used in the generation of this script can be found at:
+#   https://github.com/Griefed/ServerPackCreator/blob/8.1.1/serverpackcreator-api/src/main/resources/de/griefed/resources/server_files/default_java_template.sh
+#
+# The Linux scripts are intended to be run using bash (indicated by the `#!/usr/bin/env bash` at the top),
+# i.e. by simply calling `./start.sh` or `bash start.sh`.
+# Using any other method may work, but can also lead to unexpected behavior.
+# Running the Linux scripts on MacOS has been done before, but is not tested by the developers of ServerPackCreator.
+# Results may wary, no guarantees.
+#
+# Depending on which Minecraft version is used in this server pack, a different Java version may be installed.
+#
+# ATTENTION:
+#   This script will NOT modify the JAVA_HOME variable for your user.
+
+# commandAvailable(command)
+# Check whether the command $1 is available for execution. Can be used in if-statements.
+commandAvailable() {
+  command -v "$1" > /dev/null 2>&1
+}
+
+# installJabba
+# Downloads and installs Jabba, the software used to download and install Java for the Minecraft server.
+installJabba() {
+  echo "Downloading and installing jabba."
+  if commandAvailable curl ; then
+    curl -sL $JABBA_INSTALL_URL_SH | bash && . ~/.jabba/jabba.sh
+  elif commandAvailable wget ; then
+    wget -qO- $JABBA_INSTALL_URL_SH | bash && . ~/.jabba/jabba.sh
+  else
+    echo "[ERROR] wget or curl is required to install jabba."
+    exit 1
+  fi
+  [ -s "$JABBA_HOME/jabba.sh" ] && source "$JABBA_HOME/jabba.sh"
+}
+
+if [[ ! -s "variables.txt" ]]; then
+  echo "ERROR! variables.txt not present. Without it the server can not be installed, configured or started."
+  exit 1
+fi
+
+source "./variables.txt"
+
+# if ldd is not available, we may be on MacOS
+if commandAvailable ldd ; then
+  GBLIC_VERSION=$(ldd --version | awk '/ldd/{print $NF}')
+  IFS="." read -ra GBLIC_SEMANTICS <<<"${GBLIC_VERSION}"
+
+  # Older Linux systems aren't supported, sadly. This mainly affects Ubuntu 20 and Linux distributions from around that time
+  # which use glibc versions older than 2.32 & 2.34.
+  if [[ ${GBLIC_SEMANTICS[1]} -lt 32 ]];then
+    echo "Jabba only supports systems with glibc 2.32 & 2.34 onward. You have $GBLIC_VERSION. Automated Java installation can not proceed."
+    echo "DO NOT ATTEMPT TO UPDATE OR UPGRADE YOUR INSTALLED VERSION OF GLIBC! DOING SO MAY CORRUPT YOUR ENTIRE SYSTEM!"
+    echo "Instead, consider upgrading to a newer version of your OS. Example: In case of Ubuntu 20 LTS, consider upgrading to 22 LTS or 24 LTS."
+    echo ""
+    echo "If that is not an option, you will have to install the required Java version on your system manually, the old fashioned way."
+    echo "Your variables.txt says you require: ${JDK_VENDOR}@${RECOMMENDED_JAVA_VERSION}"
+    echo "When you installed said Java version, 'SKIP_JAVA_CHECK=true' in the variables.txt and run the start-script again."
+    exit 1
+  fi
+fi
+
+export JABBA_VERSION=${JABBA_INSTALL_VERSION}
+
+if [[ -s ~/.jabba/jabba.sh ]];then
+  source ~/.jabba/jabba.sh
+elif ! commandAvailable jabba ; then
+  echo "Automated Java installation requires a piece of Software called 'Jabba'."
+  echo "Type 'I agree' if you agree to the installation of the aforementioned software."
+  echo -n "Response: "
+  read -r ANSWER
+
+  if [[ "${ANSWER}" == "I agree" ]]; then
+    installJabba
+  else
+    echo "User did not agree to Jabba installation. Aborting Java installation process."
+    exit 1
+  fi
+fi
+
+echo "Downloading and using Java ${JDK_VENDOR}@${RECOMMENDED_JAVA_VERSION}"
+jabba install ${JDK_VENDOR}@${RECOMMENDED_JAVA_VERSION}
+jabba use ${JDK_VENDOR}@${RECOMMENDED_JAVA_VERSION}
+
+echo "Installation finished. Returning to start-script."