Add custom JVM support

config.example.env

@@ -47,6 +47,11 @@ MCSD_MEMORY_MIN=2048M
 ## >= 1.20.5         | 21
 MCSD_JAVA_VERSION=21
 
+# JAVA_CUSTOM
+## Set this to 'true' if you want to use a custom JVM
+## located at './jvm/'. This will update $JAVA_HOME
+MCSD_JAVA_CUSTOM=false
+
 # OPTIMIZED_FLAGS
 ## Applies a modified variant of Aikar's Flags
 MCSD_OPTIMIZED_FLAGS=true

docker-compose.yml

@@ -6,6 +6,7 @@ services:
   stop_grace_period: 120s
   volumes:
    - ./server:/data
+   - ./jvm:/jvm
   env_file:
    - ./config.env
   ports:

entrypoint.sh

@@ -75,6 +75,11 @@ function initialize() {
     echo ":: Warning: No/Invalid java version supplied to \$MCSD_JAVA_VERSION, defaulting to java version 17"
     export "MCSD_JAVA_VERSION=17"
   fi
+  # Java custom JVM
+  if [ ! "${MCSD_JAVA_CUSTOM}" == "true" ] && [ ! "${MCSD_JAVA_CUSTOM}" == "false" ]; then
+    echo ":: Warning: No/Invalid value supplied to \$MCSD_JAVA_CUSTOM, defaulting to false"
+    export "MCSD_JAVA_CUSTOM=false"
+  fi
   # Java optimization
   if [ ! "${MCSD_OPTIMIZED_FLAGS}" == "true" ] && [ ! "${MCSD_OPTIMIZED_FLAGS}" == "false" ]; then
     echo ":: Warning: No/Invalid value supplied to \$MCSD_OPTIMIZED_FLAGS, defaulting to true"
@@ -135,6 +140,12 @@ function compile_args() {
 # Compile java flags
 function compile_flags() {
   echo ":: Compiling java flags"
+  if [ "${MCSD_JAVA_CUSTOM}" == "true" ]; then
+    export "JAVA_HOME=/jvm"
+  else
+    export "JAVA_HOME=/usr/lib/jvm/java-${MCSD_JAVA_VERSION}-openjdk"
+  fi
+  
   export "FLAGS=-Xms${MCSD_MEMORY_MIN} -Xmx${MCSD_MEMORY_MAX}"
   case "${MCSD_OPTIMIZED_FLAGS}" in
     "true")
@@ -172,7 +183,7 @@ compile_flags
 echo ":: Starting server"
 cd /data||exit 69
 if [ -z "${MCSD_CUSTOM_ARGS}" ]; then
-	exec "/usr/lib/jvm/java-${MCSD_JAVA_VERSION}-openjdk/bin/java" ${FLAGS} -jar "/data/server.jar" ${ARGS}
+  exec "${JAVA_HOME}/bin/java" ${FLAGS} -jar "/data/server.jar" ${ARGS}
 else
-	exec "/usr/lib/jvm/java-${MCSD_JAVA_VERSION}-openjdk/bin/java" ${MCSD_CUSTOM_ARGS} -jar "/data/server.jar" ${ARGS}
+  exec "${JAVA_HOME}/bin/java" ${MCSD_CUSTOM_ARGS} -jar "/data/server.jar" ${ARGS}
 fi