Getting information from other plugins? [SOLVED]

Right now, I'm trying to get the groups a player is in from PermissionsBukkit. Here's how I tried to do this.

Code:

import java.util.List;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.plugin.PluginManager;
import com.platymuus.bukkit.permissions.Group;
import com.platymuus.bukkit.permissions.PermissionsPlugin;
public class RankTeleportListener implements Listener {
private PermissionsPlugin plugin;
 
public void registerEvents(PluginManager pm) {
    pm.registerEvents(this, plugin);
}
 
@EventHandler
public void onPlayerJoin (PlayerJoinEvent event) {
    List<Group> groups = plugin.getPlayerInfo(event.getPlayer().getName()).getGroups();
 
}

However, this creates an Event Exception whenever I run it. I know I've got the actual event set up correctly, as everything works fine if I put something else in the OnPlayerJoin listener, but when I try to do anything from the permissions plugin, I get errors.

 

Look at the stack trace, there's more than just one exception in it.

 

There's also an InvocationTargetException and a NullPointerException.
Edit: These exceptions are all coming up when a player joins, not when the server starts.

 

well you don't set the plugin variable to a value only declaring it. (If the code didn't changed.)

 

You should be able to figure out the problem by yourself with the stack trace.
If you're unable to do so, post the stack trace and where the two exceptions originated from (i.e. the files mentioned in the lines directly below the exceptions, and please mark the lines at which the exceptions occurred)

edit: well that one was easy but I couldn't see it

 

I can't figure out the problem from the stack trace, as I have no idea how to reference other plugins in the first place. I'm not really asking how to solve the error, I'm asking for someone to explain how to get information from other plugins. (Such as calling the method, getPlayerInfo() from PermissionsBukkit)

 

Put this in your plugin's onEnable():

Code:java

Plugin p = Bukkit.getPluginManager().getPlugin("PermissionsBukkit")
if (p == null || !(p instanceof PermissionsPlugin)) {
    Bukkit.getlogger().info("PermissionBukkit not found");
} else {
    permissions = (PermissionsPlugin) p;
}

where permissions is a static field, i.e. "static PermissionsPlugin permissions = null".
Remember that everytime you want to check groups you have to check whether permissions is not null first.
Don't forget to add PermissionsBukkit as dependency to your plugin.yml (i.e. add the line "softdepend: [PermissionsBukkit]")

PS: If you want your plugin to fully depend on PermissionsBukkit use "depend: [PermissionsBukkit]" instead of softdepend in the plugin.yml. In this case if PermissionBukkit is not present on the server your plugin won't load at all.

 

Alright, perfect. Thanks for the help!