fix typos, update javadocs

api/src/main/java/com/velocitypowered/api/command/CommandManager.java

@@ -36,22 +36,29 @@ public interface CommandManager {
   void unregister(String alias);
 
   /**
-   * Calls CommandExecuteEvent and attempts to execute a command from the specified {@code cmdLine}
+   * Calls CommandExecuteEvent and attempts to execute a command using the specified {@code cmdLine}
-   * sync.
+   * in a blocking fashion.
    *
    * @param source the command's source
    * @param cmdLine the command to run
    * @return true if the command was found and executed, false if it was not
+   * 
+   * @deprecated This method will block current thread during event call and command execution.
+   *             Prefer {@link #executeAsync(CommandSource, String)} instead.
    */
+  @Deprecated
   boolean execute(CommandSource source, String cmdLine);
 
   /**
-   * Attempts to execute a command from the specified {@code cmdLine} sync
+   * Attempts to execute a command using the specified {@code cmdLine} in a blocking fashion without
-   * without calling CommandExecuteEvent.
+   * calling CommandExecuteEvent.
    *
    * @param source the command's source
    * @param cmdLine the command to run
    * @return true if the command was found and executed, false if it was not
+   * 
+   * @deprecated This method will block current thread during event and command execution.
+   *             Prefer {@link #executeImmediatelyAsync(CommandSource, String)} instead.
    */
   boolean executeImmediately(CommandSource source, String cmdLine);
 
@@ -61,7 +68,8 @@ public interface CommandManager {
    *
    * @param source the command's source
    * @param cmdLine the command to run
-   * @return A future that will be completed with the result of the command execution
+   * @return A future that will be completed with the result of the command execution.
+   *         Can be completed exceptionally if exception was thrown during execution.
    */
   CompletableFuture<Boolean> executeAsync(CommandSource source, String cmdLine);
 
@@ -71,7 +79,8 @@ public interface CommandManager {
    *
    * @param source the command's source
    * @param cmdLine the command to run
-   * @return A future that will be completed with the result of the command execution
+   * @return A future that will be completed with the result of the command execution.
+   *         Can be completed exceptionally if exception was thrown during execution.
    */
   CompletableFuture<Boolean> executeImmediatelyAsync(CommandSource source, String cmdLine);
 }

api/src/main/java/com/velocitypowered/api/event/command/CommandExecuteEvent.java

@@ -18,7 +18,7 @@ public final class CommandExecuteEvent implements ResultedEvent<CommandResult> {
   private CommandResult result;
 
   /**
-   * Constructs a PlayerChatEvent.
+   * Constructs a CommandExecuteEvent.
    * @param commandSource the source executing the command
    * @param command the command being executed without first slash
    */
@@ -52,7 +52,7 @@ public final class CommandExecuteEvent implements ResultedEvent<CommandResult> {
 
   @Override
   public String toString() {
-    return "PlayerCommmandEvent{"
+    return "CommandExecuteEvent{"
         + "commandSource=" + commandSource
         + ", command=" + command
         + ", result=" + result

proxy/src/main/java/com/velocitypowered/proxy/command/VelocityCommandManager.java

@@ -64,14 +64,14 @@ public class VelocityCommandManager implements CommandManager {
    * @return CompletableFuture of event
    */
   public CompletableFuture<CommandExecuteEvent> callCommandEvent(CommandSource source, String cmd) {
-    Preconditions.checkNotNull(source, "invoker");
+    Preconditions.checkNotNull(source, "source");
     Preconditions.checkNotNull(cmd, "cmd");
     return eventManager.fire(new CommandExecuteEvent(source, cmd));
   }
 
   @Override
   public boolean execute(CommandSource source, String cmdLine) {
-    Preconditions.checkNotNull(source, "invoker");
+    Preconditions.checkNotNull(source, "source");
     Preconditions.checkNotNull(cmdLine, "cmdLine");
 
     CommandExecuteEvent event = callCommandEvent(source, cmdLine).join();
@@ -86,7 +86,7 @@ public class VelocityCommandManager implements CommandManager {
 
   @Override
   public boolean executeImmediately(CommandSource source, String cmdLine) {
-    Preconditions.checkNotNull(source, "invoker");
+    Preconditions.checkNotNull(source, "source");
     Preconditions.checkNotNull(cmdLine, "cmdLine");
 
     String alias = cmdLine;
@@ -133,6 +133,8 @@ public class VelocityCommandManager implements CommandManager {
 
   @Override
   public CompletableFuture<Boolean> executeImmediatelyAsync(CommandSource source, String cmdLine) {
+    Preconditions.checkNotNull(source, "source");
+    Preconditions.checkNotNull(cmdLine, "cmdLine");
     CompletableFuture<Boolean> result = new CompletableFuture<>();
     eventManager.getService().execute(() -> {
       try {