I have a problem in my Bukkit plugin when I'm trying to get a message from MySQL. I have a table called "ReportsLog" that store a "SenderName" and a "Message".
I think Bukkit knowledge isn't a must to solve this problem, the main error is:
[01:44:19 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'areport' in plugin StaffTrainer v1.0
This is the error:
[01:44:19 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'areport' in plugin StaffTrainer v1.0
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spi
got.jar:git-Spigot-f928e7a-e91aed8]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:14
1) ~[spigot.jar:git-Spigot-f928e7a-e91aed8]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServe
r.java:642) ~[spigot.jar:git-Spigot-f928e7a-e91aed8]
at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerCon
nection.java:1135) [spigot.jar:git-Spigot-f928e7a-e91aed8]
at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java
:970) [spigot.jar:git-Spigot-f928e7a-e91aed8]
at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java
:45) [spigot.jar:git-Spigot-f928e7a-e91aed8]
at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java
:1) [spigot.jar:git-Spigot-f928e7a-e91aed8]
at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:1
3) [spigot.jar:git-Spigot-f928e7a-e91aed8]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [
?:1.8.0_45]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_45]
at net.minecraft.server.v1_8_R3.SystemUtils.a(SystemUtils.java:19) [spig
ot.jar:git-Spigot-f928e7a-e91aed8]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:7
18) [spigot.jar:git-Spigot-f928e7a-e91aed8]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:3
67) [spigot.jar:git-Spigot-f928e7a-e91aed8]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:6
57) [spigot.jar:git-Spigot-f928e7a-e91aed8]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java
:560) [spigot.jar:git-Spigot-f928e7a-e91aed8]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_45]
Caused by: java.lang.NullPointerException
at code.katzuno.StaffTrainer.onCommand(StaffTrainer.java:80) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spi
got.jar:git-Spigot-f928e7a-e91aed8]
... 15 more
This is the code at line 80 (the code with the error):
String ReportSender = args[0];
String mesaj = mess.getMessage(ReportSender);
Most probably the error is in the function getMessage. This is the code of the function getMessage()
public String getMessage(String PlayerName) {
String mesaj = " ";
if (playerExists(PlayerName)) {
try {
ResultSet rs = StaffTrainer.mysql.query("SELECT * FROM ReportsLog WHERE SenderName= '" + PlayerName + "'");
if ( (!rs.next()) || (String.valueOf(rs.getString("Message")) == null) );
mesaj = rs.getString("Message");
} catch (SQLException e) {
e.printStackTrace();
}
} else {
createPlayer(PlayerName);
getMessage(PlayerName);
}
return mesaj;
}
The args variable is null. It says that the null pointer exception comes from that line and the only place you're trying to access a value is from that array. You'll want to make a check beforehand like this:
if (args != null) {
...
}
to prevent the exception from occuring.
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