Try to use JNI_JavaVM

src/main/java/com/oracle/dalvik/VMLauncher.java

@@ -1,7 +1,54 @@
 package com.oracle.dalvik;
 
+import android.util.*;
+
+import java.util.*;
+
 public final class VMLauncher {
 	private VMLauncher() {
 	}
-	public static native int launchJVM(String[] args);
+    public static int launchJVM(boolean useJli, List<String> args) {
+        System.out.print("Launch method: ");
+        if (useJli) {
+            System.out.println("JLI_Launch");
+            return launchJVM(args.toArray(new String[0]));
+        } else {
+            System.out.println("JNI_JavaVM");
+            args.remove(0);
+            int cpPath = args.indexOf("-cp");
+            // int jarPath = Arrays.asList(args).indexOf("-jar");
+            if (cpPath != -1) {
+                String classpath = args.remove(cpPath + 1);
+                args.set(cpPath, "-Djava.class.path=" + classpath);
+                
+                String mainClass = "";
+                int mainClassIndex;
+                for (mainClassIndex = -1; mainClassIndex < args.size(); mainClassIndex++) {
+                    if (!args.get(mainClassIndex).startsWith("-")) {
+                        mainClass = args.get(mainClassIndex);
+                        break;
+                    }
+                }
+                
+                mainClassIndex++;
+                String[] mainArgs = new String[args.size() - mainClassIndex];
+                System.arraycopy(
+                    args.toArray(new String[0]), mainClassIndex,
+                    mainArgs, 0, mainArgs.length
+                );
+
+                String[] vmArgs = new String[args.size() - mainArgs.length - 2];
+                System.arraycopy(
+                    args.toArray(new String[0]), 0,
+                    vmArgs, 0, vmArgs.length
+                );
+                
+                return createLaunchMainJVM(vmArgs, mainClass, mainArgs);
+            } else {
+                throw new RuntimeException("Invalid or unsupported classpath type");
+            }
+        }
+    }
+	private static native int launchJVM(String[] args);
+	private static native int createLaunchMainJVM(String[] vmArgs, String mainClass, String[] mainArgs);
 }

src/main/java/net/kdt/pojavlaunch/utils/JREUtils.java

@@ -205,7 +205,7 @@ public class JREUtils
         initJavaRuntime();
         chdir(Tools.DIR_GAME_NEW);
 
-        final int exitCode = VMLauncher.launchJVM(javaArgList.toArray(new String[0]));
+        final int exitCode = VMLauncher.launchJVM(false, javaArgList);
         System.out.println("Java Exit code: " + exitCode);
         if (exitCode != 0) {
             Tools.showError(new Exception("Java exited with code " + exitCode));

src/main/jni/jre_launcher.c

@@ -35,6 +35,54 @@
 
 #include "utils.h"
 
+JNIEXPORT jint JNICALL Java_com_oracle_dalvik_VMLauncher_createLaunchMainJVM(JNIEnv *env, jclass clazz, jobjectArray vmArgArr, jstring mainClassStr, jobjectArray mainArgArr) {
+    void *libjvm = dlopen("/usr/lib/jvm/java-16-openjdk/lib/server/libjvm.dylib", RTLD_NOW + RTLD_GLOBAL);
+    if (libjvm == NULL) {
+        printf("dlopen failed to open libjvm.dylib (dlerror %s).", dlerror());
+        return -1;
+    }
+    
+    JNI_CreateJavaVM_func *jl_JNI_CreateJavaVM = (JNI_CreateJavaVM_func *) dlsym(libjvm, "JNI_CreateJavaVM");
+        if (jl_JNI_CreateJavaVM == NULL) {
+        printf("dlsym failed to get JNI_CreateJavaVM (dlerror %s).\n", dlerror());
+        return -2;
+    }
+    
+    int vm_argc = (*env)->GetArrayLength(env, vmArgArr);
+    char **vm_argv = convert_to_char_array(env, vmArgArr);
+    
+    int main_argc = (*env)->GetArrayLength(env, mainArgArr);
+    char **main_argv = convert_to_char_array(env, mainArgArr);
+    
+    JavaVMInitArgs vm_args;
+    JavaVMOption options[vm_argc];
+    for (int i = 0; i < vm_argc; i++) {
+        options[i].optionString = vm_argv[i];
+    }
+    vm_args.version = JNI_VERSION_1_8;
+    vm_args.options = options;
+    vm_args.nOptions = vm_argc;
+    vm_args.ignoreUnrecognized = JNI_FALSE;
+    
+    jint res = (jint) jl_JNI_CreateJavaVM(&runtimeJavaVMPtr, (void**)&runtimeJNIEnvPtr_JRE, &vm_args);
+    // delete options;
+    
+    char *main_class_c = (*env)->GetStringUTFChars(env, mainClassStr, 0);
+    
+    jclass mainClass = (*runtimeJNIEnvPtr_JRE)->FindClass(runtimeJNIEnvPtr_JRE, main_class_c);
+    jmethodID mainMethod = (*runtimeJNIEnvPtr_JRE)->GetStaticMethodID(runtimeJNIEnvPtr_JRE, mainClass, "main", "([Ljava/lang/String;)V");
+
+    // Need recreate jobjectArray to make JNIEnv is 'runtimeJNIEnvPtr_JRE'.
+    jobjectArray runtime_main_argv = convert_from_char_array(runtimeJNIEnvPtr_JRE, main_argv, main_argc);
+    (*runtimeJNIEnvPtr_JRE)->CallStaticVoidMethod(runtimeJNIEnvPtr_JRE, mainClass, mainMethod, runtime_main_argv);
+    
+    (*env)->ReleaseStringUTFChars(env, mainClassStr, main_class_c);
+    free_char_array(env, mainArgArr, main_argv);
+    free_char_array(env, vmArgArr, vm_argv);
+    
+    return res;
+}
+
 // PojavLancher: fixme: are these wrong?
 #define FULL_VERSION "1.16.0-internal"
 #define DOT_VERSION "1.16"