[Test Minecraft on other thread] Compile fix

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

@@ -83,14 +83,17 @@ public final class Tools
             }
         }
         
-        // new Thread(() -> {
+        new Thread(() -> { try {
         
         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();
+        } catch (Throwable th) {
+            throw new RuntimeException(th);
+        }
+        }).start();
     
         // JREUtils.launchJavaVM(javaArgList);
     }