So i am programming a plugin for Minecraft Spigot but i get an Java error so that's why I'm not posting it on a minecraft plugins forum, but anyway I'm trying to save a class called GroupManager into a File (With a class called ObjectData) And after that i want to read it again, here's my error message:
[18:43:38 WARN]: at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
[18:43:38 WARN]: at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
[18:43:38 WARN]: at playerapi.cubenex.ObjectData.write(ObjectData.java:27)
[18:43:38 WARN]: at playerapi.cubenex.GroupManager.save(GroupManager.java:70)
[18:43:38 WARN]: at playerapi.cubenex.ThePlugin.onDisable(ThePlugin.java:70)
[18:43:38 WARN]: at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:323)
[18:43:38 WARN]: at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin(JavaPluginLoader.java:364)
[18:43:38 WARN]: at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:424)
[18:43:38 WARN]: at org.bukkit.plugin.SimplePluginManager.disablePlugins(SimplePluginManager.java:417)
[18:43:38 WARN]: at org.bukkit.plugin.SimplePluginManager.clearPlugins(SimplePluginManager.java:458)
[18:43:38 WARN]: at org.bukkit.craftbukkit.v1_8_R3.CraftServer.reload(CraftServer.java:708)
[18:43:38 WARN]: at org.bukkit.Bukkit.reload(Bukkit.java:535)
[18:43:38 WARN]: at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:25)
[18:43:38 WARN]: at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141)
[18:43:38 WARN]: at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641)
[18:43:38 WARN]: at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1162)
[18:43:38 WARN]: at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:997)
[18:43:38 WARN]: at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45)
[18:43:38 WARN]: at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1)
[18:43:38 WARN]: at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13)
[18:43:38 WARN]: at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[18:43:38 WARN]: at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[18:43:38 WARN]: at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44)
[18:43:38 WARN]: at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715)
[18:43:38 WARN]: at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374)
[18:43:38 WARN]: at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654)
[18:43:38 WARN]: at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557)
Here's the method when i save
public void save(){
data.write(this);
}
and when i read
public static GroupManager getGroupManager(Plugin plugin){
DataFile file = new DataFile("groups.dot", plugin);
if (!file.exists()) return new GroupManager(plugin);
ObjectData data = new ObjectData(file);
return (GroupManager) data.read();
}
the GroupManager class. And here's the method for saving(/writing)
public void write(Object obj){
file.delete();
try {
file.create();
} catch (IOException e) {
e.printStackTrace();
}
try {
FileOutputStream fos = new FileOutputStream(file);
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(obj);
oos.flush();
fos.close();
oos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
and when i read
public Object read(){
try {
FileInputStream fis = new FileInputStream(file);
ObjectInputStream ois = new ObjectInputStream(fis);
Object obj = ois.readObject();
fis.close();
ois.close();
return obj;
} catch (IOException | ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
(Those are all the methods from ObjectData class) And if you need the GroupManager class here it is:
public class GroupManager {
ObjectData data;
private ArrayList<Group> groups;
private HashMap<Player, Group> players;
public GroupManager(Plugin plugin){
data = new ObjectData(new DataFile("groups.dot", plugin));
groups = new ArrayList<Group>();
}
public void add(Player p, Group g){
players.put(p, g);
if (p.isOnline()) g.addPlayer(p);
}
public void Joined(Player p){
players.get(p).addBackPlayer(p);
}
public Group getGroup(Player p){
return players.get(p);
}
public void registerGroup(Group group){
groups.add(group);
}
public void deleteGroup(Group group){
groups.remove(group);
}
public boolean containsGroup(Group group){
return groups.contains(group);
}
public boolean containsGroup(String name){
boolean r = false;
for (int i = 0; i < groups.size(); i++){
if (groups.get(i).getGroupName().equalsIgnoreCase(name)) r = true;
}
return r;
}
public Group getGroup(String name){
Group r = null;
for (int i = 0; i < groups.size(); i++){
if (groups.get(i).getGroupName().equalsIgnoreCase(name)) r = groups.get(i);
}
return r;
}
public static GroupManager getGroupManager(Plugin plugin){
DataFile file = new DataFile("groups.dot", plugin);
if (!file.exists()) return new GroupManager(plugin);
ObjectData data = new ObjectData(file);
return (GroupManager) data.read();
}
public void save(){
data.write(this);
}
