Question getInstance() why get null

  • After careful consideration and due to limited usage, we’ve made the decision to discontinue the PaperMC forums. Moving forward, we recommend using Hangar for plugin uploads, and for all other community discussions and support, please join us on Discord.
L

LaumTop

New member
Oct 13, 2024
3
0
1
Hello. I tried to use getLogger(), but I got this error - 17:54:21 ERROR]: Error occurred while enabling Test1 v1.0 (Is it up to date?) java.lang.NullPointerException: Cannot invoke "LT.test2.Test2.getLogger()" because "this.test" is null. How I can fix it

Code here -

Java: 
package LT.test1;

import LT.test2.Test2;
import org.bukkit.plugin.java.JavaPlugin;

public final class Test1 extends JavaPlugin {

Test2 test;

   @Override
public void onEnable() {
test = Test2.getInstance();
test.getLogger().info("test");
}

   @Override
public void onDisable()
{

}
}

YAML: 
   name: Test1
   version: '1.0'
   main: LT.test1.Test1
   api-version: '1.20'
   depend: [test2]

Second plugin
Java: 
package LT.test2;

import org.bukkit.plugin.java.JavaPlugin;

public final class Test2 extends JavaPlugin {

private static Test2 instance;

   @Override
public void onEnable() {
instance = this;

}

public static Test2 getInstance()
{
return instance;
}


   @Override
public void onDisable() {
// Plugin shutdown logic
}
}
YAML: 
   name: test2
   version: '1.0'
   main: LT.test2.Test2
   api-version: '1.20'

Server log
Code: 
[13:57:11] [ServerMain/INFO]: Environment: Environment[sessionHost=https://sessionserver.mojang.com, servicesHost=https://api.minecraftservices.com, name=PROD]
[13:57:12] [ServerMain/INFO]: Loaded 1174 recipes
[13:57:12] [ServerMain/INFO]: Loaded 1271 advancements
[13:57:12] [Server thread/INFO]: Starting minecraft server version 1.20.4
[13:57:12] [Server thread/INFO]: Loading properties
[13:57:12] [Server thread/INFO]: This server is running Paper version git-Paper-398 (MC: 1.20.4) (Implementing API version 1.20.4-R0.1-SNAPSHOT) (Git: b700460)
[13:57:13] [Server thread/INFO]: Server Ping Player Sample Count: 12
[13:57:13] [Server thread/INFO]: Using 4 threads for Netty based IO
[13:57:13] [Server thread/WARN]: [!] The timings profiler has been enabled but has been scheduled for removal from Paper in the future.
    We recommend installing the spark profiler as a replacement: https://spark.lucko.me/
    For more information please visit: https://github.com/PaperMC/Paper/issues/8948
[13:57:13] [Server thread/INFO]: [ChunkTaskScheduler] Chunk system is using 1 I/O threads, 3 worker threads, and gen parallelism of 3 threads
[13:57:13] [Server thread/INFO]: Default game type: SURVIVAL
[13:57:13] [Server thread/INFO]: Generating keypair
[13:57:13] [Server thread/INFO]: Starting Minecraft server on *:25565
[13:57:13] [Server thread/INFO]: Using epoll channel type
[13:57:13] [Server thread/INFO]: Paper: Using libdeflate (Linux x86_64) compression from Velocity.
[13:57:13] [Server thread/INFO]: Paper: Using OpenSSL 3.0.x (Linux x86_64) cipher from Velocity.
[13:57:13] [Server thread/INFO]: [test2] Loading server plugin test2 v1.0
[13:57:13] [Server thread/INFO]: [Paper_Economy] Loading server plugin Paper_Economy v1.0
[13:57:13] [Server thread/INFO]: [Test1] Loading server plugin Test1 v1.0
[13:57:13] [Server thread/INFO]: [ChatGame] Loading server plugin ChatGame v1.0
[13:57:13] [Server thread/INFO]: [Kits] Loading server plugin Kits v1.0
[13:57:13] [Server thread/INFO]: [Regions] Loading server plugin Regions v1.0
[13:57:13] [Server thread/INFO]: [Basics] Loading server plugin Basics v1.0
[13:57:13] [Server thread/INFO]: Server permissions file permissions.yml is empty, ignoring it
[13:57:13] [Server thread/INFO]: Preparing level "world"
[13:57:13] [Server thread/INFO]: Preparing start region for dimension minecraft:overworld
[13:57:13] [Server thread/INFO]: Time elapsed: 114 ms
[13:57:13] [Server thread/INFO]: Preparing start region for dimension minecraft:the_nether
[13:57:14] [Server thread/INFO]: Time elapsed: 1003 ms
[13:57:14] [Server thread/INFO]: Preparing start region for dimension minecraft:the_end
[13:57:14] [Server thread/INFO]: Time elapsed: 19 ms
[13:57:14] [Server thread/INFO]: [test2] Enabling test2 v1.0
[13:57:14] [Server thread/INFO]: [Paper_Economy] Enabling Paper_Economy v1.0
[13:57:14] [Server thread/INFO]: [Test1] Enabling Test1 v1.0
[13:57:14] [Server thread/ERROR]: Error occurred while enabling Test1 v1.0 (Is it up to date?)
java.lang.NullPointerException: Cannot invoke "LT.test2.Test2.getLogger()" because "this.test" is null
    at LT.test1.Test1.onEnable(Test1.java:13) ~[test1-1.0.jar:?]
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:281) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
    at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:190) ~[paper-1.20.4.jar:git-Paper-398]
    at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:104) ~[paper-1.20.4.jar:git-Paper-398]
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:507) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
    at org.bukkit.craftbukkit.v1_20_R3.CraftServer.enablePlugin(CraftServer.java:637) ~[paper-1.20.4.jar:git-Paper-398]
    at org.bukkit.craftbukkit.v1_20_R3.CraftServer.enablePlugins(CraftServer.java:548) ~[paper-1.20.4.jar:git-Paper-398]
    at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:670) ~[paper-1.20.4.jar:git-Paper-398]
    at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:430) ~[paper-1.20.4.jar:git-Paper-398]
    at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:308) ~[paper-1.20.4.jar:git-Paper-398]
    at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1129) ~[paper-1.20.4.jar:git-Paper-398]
    at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:318) ~[paper-1.20.4.jar:git-Paper-398]
    at java.lang.Thread.run(Thread.java:1583) ~[?:?]
[13:57:14] [Server thread/INFO]: [Test1] Disabling Test1 v1.0
[13:57:14] [Server thread/INFO]: [ChatGame] Enabling ChatGame v1.0
[13:57:14] [Server thread/ERROR]: [ChatGame] Paper_Economy plugin not found or incompatible!
[13:57:14] [Server thread/INFO]: [ChatGame] Disabling ChatGame v1.0
[13:57:14] [Server thread/INFO]: [Kits] Enabling Kits v1.0
[13:57:14] [Server thread/INFO]: [Kits] Started
[13:57:15] [Server thread/INFO]: [Regions] Enabling Regions v1.0
[13:57:15] [Server thread/INFO]: [Basics] Enabling Basics v1.0
[13:57:15] [Server thread/INFO]: [Basics] Starting...
[13:57:15] [Server thread/INFO]: Running delayed init tasks
[13:57:15] [Server thread/INFO]: Done (2.439s)! For help, type "help"
[13:57:15] [Server thread/INFO]: Timings Reset
[13:57:16] [Server thread/INFO]: Stopping server
[13:57:16] [Server thread/INFO]: [Basics] Disabling Basics v1.0
[13:57:16] [Server thread/INFO]: [Regions] Disabling Regions v1.0
[13:57:16] [Server thread/INFO]: [Kits] Disabling Kits v1.0
[13:57:16] [Server thread/INFO]: [Paper_Economy] Disabling Paper_Economy v1.0
[13:57:16] [Server thread/INFO]: [test2] Disabling test2 v1.0
[13:57:16] [Server thread/INFO]: Saving players
[13:57:16] [Server thread/INFO]: Saving worlds
[13:57:16] [Server thread/INFO]: Saving chunks for level 'ServerLevel[world]'/minecraft:overworld
[13:57:16] [Server thread/INFO]: [ChunkHolderManager] Waiting 60s for chunk system to halt for world 'world'
[13:57:16] [Server thread/INFO]: [ChunkHolderManager] Halted chunk system for world 'world'
[13:57:16] [Server thread/INFO]: [ChunkHolderManager] Saving all chunkholders for world 'world'
[13:57:17] [Server thread/INFO]: [ChunkHolderManager] Saved 529 block chunks, 529 entity chunks, 0 poi chunks in world 'world' in 0.63s
[13:57:17] [Server thread/INFO]: ThreadedAnvilChunkStorage (world): All chunks are saved
[13:57:17] [Server thread/INFO]: Saving chunks for level 'ServerLevel[world_nether]'/minecraft:the_nether
[13:57:17] [Server thread/INFO]: [ChunkHolderManager] Waiting 60s for chunk system to halt for world 'world_nether'
[13:57:17] [Server thread/INFO]: [ChunkHolderManager] Halted chunk system for world 'world_nether'
[13:57:17] [Server thread/INFO]: [ChunkHolderManager] Saving all chunkholders for world 'world_nether'
[13:57:17] [Server thread/INFO]: [ChunkHolderManager] Saved 529 block chunks, 529 entity chunks, 0 poi chunks in world 'world_nether' in 0.36s
[13:57:17] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved
[13:57:17] [Server thread/INFO]: Saving chunks for level 'ServerLevel[world_the_end]'/minecraft:the_end
[13:57:17] [Server thread/INFO]: [ChunkHolderManager] Waiting 60s for chunk system to halt for world 'world_the_end'
[13:57:17] [Server thread/INFO]: [ChunkHolderManager] Halted chunk system for world 'world_the_end'
[13:57:17] [Server thread/INFO]: [ChunkHolderManager] Saving all chunkholders for world 'world_the_end'
[13:57:17] [Server thread/INFO]: [ChunkHolderManager] Saved 529 block chunks, 529 entity chunks, 0 poi chunks in world 'world_the_end' in 0.07s
[13:57:17] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved
[13:57:17] [Server thread/INFO]: ThreadedAnvilChunkStorage: All dimensions are saved
[13:57:17] [Server thread/INFO]: Flushing Chunk IO
[13:57:17] [Server thread/INFO]: Closing Thread Pool
[13:57:17] [Server thread/INFO]: Closing Server
 
Version Output
Paper version git-Paper-398 (MC: 1.20.4) (Implementing API version 1.20.4-R0.1-SNAPSHOT) (Git: b700460)
L

LaumTop

New member
Oct 13, 2024
3
0
1
Some more info. If I in getInstance() return for example int and number 1. I get this value, and I dont get Null exception
 
You must log in or register to reply here.