Plugin Lifecycle

1public class MyPlugin extends JavaPlugin {
2    
3    private DatabaseConnection database;
4    
5    public MyPlugin(JavaPluginInit init) {
6        super(init);
7    }
8    
9    @Override
10    protected void setup() {
11        // Phase 1: Setup
12        // - Load configuration files
13        // - Initialize connections
14        // - Validate dependencies
15        
16        getLogger().info("Loading configuration...");
17        database = new DatabaseConnection(getConfig());
18    }
19    
20    @Override
21    protected void start() {
22        // Phase 2: Start
23        // - Register commands
24        // - Register event listeners
25        // - Start scheduled tasks
26        // - Players can join after this
27        
28        getEventRegistry().register(
29            PlayerConnectEvent.class, 
30            this::onPlayerConnect
31        );
32        
33        getLogger().info("Plugin ready!");
34    }
35    
36    @Override
37    protected void shutdown() {
38        // Phase 3: Shutdown
39        // - Save player data
40        // - Close connections
41        // - Cancel running tasks
42        
43        if (database != null) {
44            database.close();
45        }
46        
47        getLogger().info("Plugin stopped.");
48    }
49    
50    private void onPlayerConnect(PlayerConnectEvent event) {
51        Player player = event.getPlayer();
52        getLogger().info("Player joined: " + player.getName());
53    }
54}

1// CORRECT
2public MyPlugin(JavaPluginInit init) {
3    super(init);
4}
5
6// WRONG - Missing super call
7public MyPlugin(JavaPluginInit init) {
8    // Missing super(init)!
9}
10
11// WRONG - Wrong constructor signature
12public MyPlugin() {
13    // Wrong! Must accept JavaPluginInit
14}