1.21 seems to work fine. However, support 1.21.1, 1.21.2, and 1.21.3 should be added. Currently, the plugin gets disabled with an error thrown in console. The error sent is below:
[12:36:09 INFO]: [NBTAPI] [NBTAPI] Using the plugin 'EvenMoreFish' to create a bStats instance!
[12:36:09 ERROR]: Error occurred while enabling EvenMoreFish v1.7.3 (Is it up to date?)
java.lang.RuntimeException: NBT-API wasn't initialized properly, disabling the plugin
at even-more-fish-1.7.3-RELEASE.jar/com.oheers.fish.EvenMoreFish.onEnable(EvenMoreFish.java:130) ~[even-more-fish-1.7.3-RELEASE.jar:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:288) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:643) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:592) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:767) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:529) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:326) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1233) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:339) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
[12:36:09 INFO]: [EvenMoreFish] Disabling EvenMoreFish v1.7.3
[12:36:09 ERROR]: Error occurred while disabling EvenMoreFish v1.7.3
java.lang.NullPointerException: Cannot invoke "com.oheers.fish.config.MainConfig.isDatabaseOnline()" because the return value of "com.oheers.fish.config.MainConfig.getInstance()" is null
at even-more-fish-1.7.3-RELEASE.jar/com.oheers.fish.EvenMoreFish.lambda$saveUserData$19(EvenMoreFish.java:485) ~[even-more-fish-1.7.3-RELEASE.jar:?]
at even-more-fish-1.7.3-RELEASE.jar/com.oheers.fish.EvenMoreFish.saveUserData(EvenMoreFish.java:497) ~[even-more-fish-1.7.3-RELEASE.jar:?]
at even-more-fish-1.7.3-RELEASE.jar/com.oheers.fish.EvenMoreFish.onDisable(EvenMoreFish.java:243) ~[even-more-fish-1.7.3-RELEASE.jar:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:291) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.disablePlugin(PaperPluginInstanceManager.java:237) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.disablePlugin(PaperPluginManagerImpl.java:114) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:550) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:206) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:643) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:592) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:767) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:529) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:326) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1233) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:339) ~[paper-1.21.3.jar:1.21.3-15-99f4bb2]
at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Suggestion
1.21 seems to work fine. However, support 1.21.1, 1.21.2, and 1.21.3 should be added. Currently, the plugin gets disabled with an error thrown in console. The error sent is below: