Add port and jvmArgs options

src/main/java/org/strassburger/mcrun/RunServerMojo.java

@@ -6,7 +6,6 @@ import org.apache.maven.plugin.MojoFailureException;
 import org.apache.maven.plugins.annotations.LifecyclePhase;
 import org.apache.maven.plugins.annotations.Mojo;
 import org.apache.maven.plugins.annotations.Parameter;
-import org.strassburger.mcrun.downloader.PaperServerJarDownloader;
 import org.strassburger.mcrun.downloader.ServerJarDownloadException;
 import org.strassburger.mcrun.downloader.ServerJarDownloader;
 
@@ -14,6 +13,8 @@ import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.StandardCopyOption;
+import java.util.ArrayList;
+import java.util.List;
 
 @Mojo(name = "run", defaultPhase = LifecyclePhase.PACKAGE)
 public class RunServerMojo extends AbstractMojo {
@@ -38,6 +39,12 @@ public class RunServerMojo extends AbstractMojo {
     @Parameter(defaultValue = "true")
     private boolean acceptEula;
 
+    @Parameter
+    private List<String> jvmArgs = new ArrayList<>();
+
+    @Parameter
+    private Integer port;
+
     @Override
     public void execute() throws MojoExecutionException, MojoFailureException {
         getLog().info("Server directory: " + serverDirectory.getAbsolutePath());
@@ -61,12 +68,13 @@ public class RunServerMojo extends AbstractMojo {
         } catch (ServerJarDownloadException e) {
             throw new MojoExecutionException("Failed to download server jar", e);
         }
+
         if (acceptEula) acceptEula();
 
-        ProcessBuilder pb = new ProcessBuilder(
-                "java", "-Xmx" + memory, "-Xms" + memory,
-                "-jar", serverJarName, "--nogui"
-        );
+        List<String> command = buildCommand();
+        getLog().info("Starting server with command: " + String.join(" ", command));
+
+        ProcessBuilder pb = new ProcessBuilder(command);
         pb.directory(serverDirectory);
         pb.inheritIO();
         Process process;
@@ -82,6 +90,22 @@ public class RunServerMojo extends AbstractMojo {
         }
     }
 
+    private List<String> buildCommand() {
+        List<String> cmd = new ArrayList<>();
+        cmd.add("java");
+        cmd.add("-Xmx" + memory);
+        cmd.add("-Xms" + memory);
+        cmd.addAll(jvmArgs);
+        cmd.add("-jar");
+        cmd.add(serverJarName);
+        cmd.add("--nogui");
+        if (port != null) {
+            cmd.add("--port");
+            cmd.add(String.valueOf(port));
+        }
+        return cmd;
+    }
+
     private void acceptEula() throws MojoExecutionException {
         File eula = new File(serverDirectory, "eula.txt");
         if (eula.exists()) return;
@@ -92,4 +116,4 @@ public class RunServerMojo extends AbstractMojo {
             throw new MojoExecutionException("Failed to write eula.txt: " + e.getMessage(), e);
         }
     }
-}
+}