DavidM

Please stop bumping your thread like this, as it can be annoying and unnecessary. Packets. However, I am not exactly sure what you are trying to do, and packets might not be the best solution. Are you trying to make the broom kill itself when it is too fast, or is the broom currently killing itself when flown too fast (and you don't want that)?

That is why you should not be spoon-fed with tutorials without knowing what you are trying to accomplish.

It worked since the newer crash is not caused by the same cause. Update NEI. If the crash still occurs, report it to the author.

You are supposed to override Block#hasTIleEntity.

Remove Optifine and try again.

No you don't. Do not necro old thread; please make your own thread.

Please read the EAQ and post the appropriate log(s).

MCEdit?

You are removing the same iterator over and over again. That is not going to work. Read: https://www.tutorialspoint.com/java/java_using_iterator.htm I would use Collection#removeIf though.

You gonna pay for his plane ticket?

Remove Optifine and try again.

Please post a screenshot of your launcher and the versions dropdown menu.

Using hacks on servers is not wise and will result in a ban.

Post the new log with Java 8 or 10.

You don't. JavaFX is not involved in Minecraft at all.

It means you need to make your port public so your friends can access it. Read the manual of your router to learn how to port forward with your specific router.

Use less mods.

Personally, I would say yes. i.e. All the custom name part are completely not necessary, and the getField/setField with an id is pointless. use normal getters and setters instead.

It seems like you are following HarryTalks’ tutorials. Stop. His tutorials are terrible as they use outdated code and promote bad practices.

DartCraftReloaded is badly made and is broken. Remove the mod and report the crash to the author.

Try without texture pack. If this still occurs, post your logs according to the EAQ.

The stacktrace in the log indicates so.

If you are indeed downloading from the official site, there will not be such problem. Are you sure you are downloading from the official site? Are you sure you selected the right version (1.14.2) to download?

Just run the jar...

Unless you've changed your previous code, since "stack == new ItemStack(Block blockIn, int amount, int meta)" will never be true. Instead of direct comparison, it would be better to check the meta of the already existing ItemStack.