change jar to server.jar

Dockerfile

@@ -1,3 +1,4 @@
+ARG VERSION=17
 FROM golang AS builder
 
 WORKDIR /app
@@ -9,8 +10,8 @@ COPY ./go.sum /app
 RUN go build -o /app/main /app/src/main.go 
 RUN go build -o /app/cmd /app/src/cmd.go 
 
-ARG JAVA_VERSION=16
-FROM openjdk:16
+
+FROM openjdk:$VERSION
 
 ENV MIN_MEM=512M
 ENV MAX_MEM=1G

docker-compose.yml

@@ -10,7 +10,7 @@ services:
         MIN_MEM: 1G
         MAX_MEM: 1G
         STOP: stop
-        JAR: jar.jar
+        JAR: server.jar
         REGEX: "Preparing spawn area:"
       ports:
         - 25565:25565

src/main.go

@@ -12,6 +12,7 @@ import (
 	"syscall"
 	"log"
 	"regexp"
+	"bytes"
 
 	"github.com/creack/pty"
 )
@@ -41,6 +42,14 @@ func main() {
 		}
 	}
 
+	//create command
+	var cmdversion *exec.Cmd
+	cmdversion = exec.Command("java", "--version")
+	var out bytes.Buffer
+	cmdversion.Stdout = &out
+	cmdversion.Run()
+	log.Println(out.String())
+
 	log.Printf("Ram: Min: %s Max: %s Stop: %s Jar: %s\n\r", minram, maxram, stop, jar)
 
 	//check if there is a server jar
@@ -49,8 +58,8 @@ func main() {
 		os.Exit(1)
 	}
 	
-	//create command
 	var cmd *exec.Cmd
+	
 	if args == "" {
 		cmd = exec.Command("java", minram, maxram, "-jar", jar)
 	} else {
@@ -66,6 +75,8 @@ func main() {
 		panic(err)
 	
 	}
+
+	ln, _ := net.Listen("tcp", ":8081")
 	
 	//cleanup
 	defer func() {
@@ -85,7 +96,7 @@ func main() {
 	}()
 
 	//accepts command from cmd.go and sends them to the server
-	ln, _ := net.Listen("tcp", ":8081")
+	
 	go func() {
 		//accept connections from clients
 		for {