Add missing import; Test Minecraft on other thread

JavaApp/src/main/java/net/kdt/pojavlaunch/Tools.java

@@ -5,8 +5,7 @@ import com.google.gson.*;
 import com.oracle.dalvik.*;
 import java.io.*;
 import java.lang.reflect.*;
-import java.net.HttpURLConnection;
-import java.net.URL;
+import java.net.*;
 import java.nio.charset.*;
 import java.util.*;
 import java.util.zip.*;
@@ -84,10 +83,14 @@ public final class Tools
             }
         }
         
+        new Thread(() -> {
+        
         URLClassLoader loader = new URLClassLoader(urlList.toArray(new URL[0]), Tools.class.getClassLoader());
         Class<?> clazz = loader.loadClass(versionInfo.mainClass);
         Method method = clazz.getMethod("main", String[].class);
         method.invoke(null, new Object[]{Arrays.asList(launchArgs)});
+        
+        }).start();
 
         // JREUtils.launchJavaVM(javaArgList);
     }