Bukkit | The Minecraft Mod API | Video Game library

There exist multiple ways to add local jar files to a Maven project below I show you 2:

1.Adding directly the dependency as system scope:

Assuming that the JAR is located in /lib add the dependency in your pom.xml:

This is impossible because the ClickEvent and HoverEvent are entirely client-side. That means that there are no packets sent from the Player to the server. Therefore, it is impossible to callback the click of the Player and call a method to perform what you are trying to do.

You may notice that all the ClickEvent.Actions do not affect the server. OPEN_URL, OPEN_FILE, RUN_COMMAND, SUGGEST_COMMAND, CHANGE_PAGE and COPY_TO_CLIPBOARD are all actions taken on the client-side.

The only way here is to make the client send a command to the server which will trigger a method.

Upon searching, you probably have the same problem as this. In there, it is told to remove the piece of code where it is creating a new instance of the main class.

In your situation, try removing this part in your GUI class:

You should use Bukkit.getScheduler().scheduleSyncRepeatingTask(...) in place of that for loop and TimeUnit.SECONDS.sleep

Your issue is that you're checking for equality between a Block (the result of e.getBlockPlaced()) and a string. These two will never be equal and so your condition is not met.

You could change your condition so that it checks the ItemStack in the player's hand when the block was placed. You also didn't check for the block type and so I've added a check for TNT in my example code below but you can just remove that for it to work with any block with the custom name.

You can create and call your own custom events using the Bukkit Event API. Spigot has a good starting tutorial on the Event API.

A simple example of a Cancellable event that takes a Player:

It's been a long time since I have used spigot/bukkit, but I believe to change a block you need to use Block.setType​(Material type); rather than just changing the returned material blockMaterial = Material.AIR;

This should do the trick to change the type:

this in that position references the BukkitRunnable(), not your Main class. You can fix this by passing a reference to your Plugin like so

The exception is explicit, you cannot call a synchronous method asynchronously. This is to ensure that thread safety is upheld. To fix your code, you would need to change out runTaskAsynchronously() with runTask(), however, with your current code, this would freeze the main thread.

A better solution is to use the runTaskTimer() method. You can create a new class that extends BukkitRunnable. The below code is untested but it should be close to what you need: