Why do i get NullPointerExeption

I get this error

Code:

java.lang.NullPointerException
    at net.umc.Rob4001.sqljava.Residents.<init>(Residents.java:16)
    at net.umc.Rob4001.UmTowny.UmTowny.onEnable(UmTowny.java:48)
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:126)
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:857)
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:264)
    at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:151)
    at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:136)
    at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:284)
    at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:271)
    at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:148)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:335)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)

With this code

Code:

    private final sqlCore data;
    private Resident[] ress;
    private int last;

    public Residents(sqlCore sql) {
        data = sql;
        last = 0;
//THis line 16 \/
        ress[0]= new Resident("tester","test","owner");
        load();
    }

    public void load() {
        if (data.checkTable("res") == false) {
            data.createTable("CREATE TABLE res (id INT AUTO_INCREMENT PRIMARY_KEY, name VARCHAR(255), rank VARCHAR(255), town VARCHAR(255));");
        }
        String query = "SELECT * FROM res;";
        ResultSet rs = data.sqlQuery(query);
        try {
            while (rs.next()) {
                String name = rs.getString("name");
                ress[last] = new Resident(name,rs.getString("rank"),rs.getString("town"));

                last += 1;
            }
        } catch (SQLException e) {

            e.printStackTrace();
        }

    }

When the resident.java is

Code:

public class Resident {
private final String name;
private String town;
private String rank;

public Resident(String n,String Town,String rank){
    name = n.toLowerCase();
    this.town = Town;
    this.rank = rank;

}

public String getName() {
    return name;
}

public void setTown(String town) {
    this.town = town.toLowerCase();
}

public String getTown() {
    return town;
}

public void setRank(String rank) {
    this.rank = rank.toLowerCase();
}

public String getRank() {
    return rank;
}

}

Why?

 

Are you sure it's your sqljava file that you posted? the one with the line 16?

 

Your ress[] array is not initialized. You should have something like this in there.

Code:

ress = new Resident[10];

It might be easier for you to just use an ArrayList.

 

Yes i am sure that is
net.umc.Rob4001.sqljava.Residents.java

so would i have to capp it or is there a way of making an unlimited one?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Use an ArrayList.

 

Could you provide a bit of code?

 

Code:

ArrayList<Resident> ress = new ArrayList<Resident>();
...
ress.add(new Resident("tester","test","owner"));

 

Thank you very much