add in java custom args

README.md

@@ -30,6 +30,7 @@ docker run -d \
     -e JAVA_INITIAL_HEAP_SIZE=<java initial heap size in megabytes> \
     -e JAVA_MAX_HEAP_SIZE=<java max heap size in megabytes> \
     -e JAVA_MAX_THREADS=<java max number of threads> \
+    -e JAVA_CUSTOM_ARGS=<java custom arguments> \
     -e STARTUP_CMD=<minecraft console command to execute on startup> \
     -e UMASK=<umask for created files> \
     -e PUID=<uid for user> \
@@ -65,6 +66,7 @@ docker run -d \
     -e JAVA_INITIAL_HEAP_SIZE=512M \
     -e JAVA_MAX_HEAP_SIZE=1024M \
     -e JAVA_MAX_THREADS=1 \
+    -e JAVA_CUSTOM_ARGS='' \
     -e STARTUP_CMD=gamerule reducedDebugInfo true \
     -e UMASK=000 \
     -e PUID=0 \

build/root/install.sh

@@ -273,6 +273,13 @@ else
 	export JAVA_MAX_THREADS="1"
 fi
 
+export JAVA_CUSTOM_ARGS=$(echo "${JAVA_CUSTOM_ARGS}" | sed -e 's~^[ \t]*~~;s~[ \t]*$~~')
+if [[ ! -z "${JAVA_CUSTOM_ARGS}" ]]; then
+	echo "[info] JAVA_CUSTOM_ARGS defined as '${JAVA_CUSTOM_ARGS}'" | ts '%Y-%m-%d %H:%M:%.S'
+else
+	echo "[info] JAVA_CUSTOM_ARGS not defined,(via -e JAVA_CUSTOM_ARGS)" | ts '%Y-%m-%d %H:%M:%.S'
+fi
+
 export STARTUP_CMD=$(echo "${STARTUP_CMD}" | sed -e 's~^[ \t]*~~;s~[ \t]*$~~')
 if [[ ! -z "${STARTUP_CMD}" ]]; then
 	echo "[info] STARTUP_CMD defined as '${STARTUP_CMD}'" | ts '%Y-%m-%d %H:%M:%.S'

run/nobody/start.sh

@@ -121,7 +121,7 @@ function start_minecraft() {
 	# run screen attached to minecraft (daemonized, non-blocking) to allow users to run commands in minecraft console
 	echo "[info] Starting Minecraft Java process..."
 	set -x
-	screen -L -Logfile '/config/minecraft/logs/screen.log' -d -S minecraft -m bash -c "cd /config/minecraft && java -Xms${JAVA_INITIAL_HEAP_SIZE} -Xmx${JAVA_MAX_HEAP_SIZE} -XX:ParallelGCThreads=${JAVA_MAX_THREADS} ${java_log4j_mitigation} -jar ${CUSTOM_JAR_PATH} nogui"
+	screen -L -Logfile '/config/minecraft/logs/screen.log' -d -S minecraft -m bash -c "cd /config/minecraft && java -Xms${JAVA_INITIAL_HEAP_SIZE} -Xmx${JAVA_MAX_HEAP_SIZE} -XX:ParallelGCThreads=${JAVA_MAX_THREADS} ${JAVA_CUSTOM_ARGS} ${java_log4j_mitigation} -jar ${CUSTOM_JAR_PATH} nogui"
 	set +x
 	echo "[info] Minecraft Java process is running"
 	if [[ ! -z "${STARTUP_CMD}" ]]; then