Here is a minimal example of a Bukkit Minecraft Plugin in Java:

```java
// Import necessary Bukkit classes
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.ChatColor;

// Main class should extend JavaPlugin
public class ExamplePlugin extends JavaPlugin {

    // onEnable method
    @Override
    public void onEnable() {
        // Log a message to the console when the plugin is enabled
        getLogger().info("ExamplePlugin has been enabled!");
    }

    // onDisable method
    @Override
    public void onDisable() {
        // Log a message to the console when the plugin is disabled
        getLogger().info("ExamplePlugin has been disabled!");
    }

    // onCommand method
    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        // Check if the command is "example"
        if (cmd.getName().equalsIgnoreCase("example")) {
            // Send a message to the command sender
            sender.sendMessage(ChatColor.GREEN + "Hello from ExamplePlugin!");
            return true;
        }
        return false;
    }
}
```

This minimal example plugin does the following:

1. Logs a message to the console when the plugin is enabled and disabled.
2. Adds a new command "/example" that sends a message "Hello from ExamplePlugin!" to the player who entered the command.

To use this plugin, you'll need to create a plugin.yml file with the following content:

```yaml
name: ExamplePlugin
version: 1.0
main: <your_package_name>.ExamplePlugin
commands:
  example:
    description: Example command for the ExamplePlugin
    usage: /<command>
```

Replace `<your_package_name>` with the package name you used for your Java class. Compile the Java class and the plugin.yml file into a JAR file, and place it in the "plugins" folder of your Bukkit server. Restart the server, and the plugin should be loaded and ready to use.
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