Stack Trace:
java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @6c0b7224
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199)
at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
at com.comphenix.protocol.reflect.compiler.StructureCompiler.generateClass(StructureCompiler.java:299)
at com.comphenix.protocol.reflect.compiler.StructureCompiler.compile(StructureCompiler.java:213)
at com.comphenix.protocol.reflect.compiler.BackgroundCompiler$2.call(BackgroundCompiler.java:204)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
at java.base/java.lang.Thread.run(Thread.java:831)
Dump:
Parameters:
com.comphenix.protocol.reflect.StructureModifier@731dc347[
targetType=class net.minecraft.server.v1_16_R3.PacketPlayOutBlockChange
target=
converter=
fieldType=class java.lang.Object
data=[private net.minecraft.server.v1_16_R3.BlockPosition net.minecraft.server.v1_16_R3.PacketPlayOutBlockChange.a, public net.minecraft.server.v1_16_R3.IBlockData net.minecraft.server.v1_16_R3.PacketPlayOutBlockChange.block]
defaultFields={private net.minecraft.server.v1_16_R3.BlockPosition net.minecraft.server.v1_16_R3.PacketPlayOutBlockChange.a=0}
subtypeCache={}
customConvertHandling=false
useStructureCompiler=true
]
manager:
com.comphenix.protocol.injector.PacketFilterManager@45904d4b[
unhookTask=com.comphenix.protocol.injector.DelayedSingleTask@30642e1c
packetListeners=[PacketAdapter[plugin=AAC5, sending=ListeningWhitelist[priority=LOW, packets=[ENTITY_ACTION[class=PacketPlayInEntityAction, id=28], BLOCK_DIG[class=PacketPlayInBlockDig, id=27], ABILITIES[class=PacketPlayInAbilities, id=26], BLOCK_CHANGE[class=PacketPlayOutBlockChange, id=11], VEHICLE_MOVE[class=PacketPlayInVehicleMove, id=22], FLYING[class=PacketPlayInFlying, id=21], TELEPORT_ACCEPT[class=PacketPlayInTeleportAccept, id=0], POSITION[class=PacketPlayOutPosition, id=52], ARM_ANIMATION[class=PacketPlayInArmAnimation, id=44], MULTI_BLOCK_CHANGE[class=PacketPlayOutMultiBlockChange, id=59], LOOK[class=PacketPlayInLook, id=20], POSITION_LOOK[class=PacketPlayInPositionLook, id=19], MAP_CHUNK[class=PacketPlayOutMapChunk, id=32], POSITION[class=PacketPlayInPosition, id=18], BLOCK_PLACE[class=PacketPlayInBlockPlace, id=47], USE_ENTITY[class=PacketPlayInUseEntity, id=14], USE_ITEM[class=PacketPlayInUseItem, id=46], ENTITY_VELOCITY[class=PacketPlayOutEntityVelocity, id=70]], gamephase=PLAYING, options=[ASYNC]], receiving=ListeningWhitelist[priority=LOW, packets=[ENTITY_ACTION[class=PacketPlayInEntityAction, id=28], BLOCK_DIG[class=PacketPlayInBlockDig, id=27], ABILITIES[class=PacketPlayInAbilities, id=26], BLOCK_CHANGE[class=PacketPlayOutBlockChange, id=11], VEHICLE_MOVE[class=PacketPlayInVehicleMove, id=22], FLYING[class=PacketPlayInFlying, id=21], TELEPORT_ACCEPT[class=PacketPlayInTeleportAccept, id=0], POSITION[class=PacketPlayOutPosition, id=52], ARM_ANIMATION[class=PacketPlayInArmAnimation, id=44], MULTI_BLOCK_CHANGE[class=PacketPlayOutMultiBlockChange, id=59], LOOK[class=PacketPlayInLook, id=20], POSITION_LOOK[class=PacketPlayInPositionLook, id=19], MAP_CHUNK[class=PacketPlayOutMapChunk, id=32], POSITION[class=PacketPlayInPosition, id=18], BLOCK_PLACE[class=PacketPlayInBlockPlace, id=47], USE_ENTITY[class=PacketPlayInUseEntity, id=14], USE_ITEM[class=PacketPlayInUseItem, id=46], ENTITY_VELOCITY[class=PacketPlayOutEntityVelocity, id=70]], gamephase=PLAYING, options=[ASYNC]]]]
packetInjector=com.comphenix.protocol.injector.netty.ProtocolInjector$5@6eade12
playerInjection=com.comphenix.protocol.injector.netty.ProtocolInjector$4@1bf02273
inputBufferedPackets=[]
recievedListeners=com.comphenix.protocol.injector.SortedPacketListenerList@5c4dce53
sendingListeners=com.comphenix.protocol.injector.SortedPacketListenerList@4d481f08
hasClosed=false
classLoader=PluginClassLoader{plugin=ProtocolLib v4.6.0, pluginEnabled=true, url=plugins\ProtocolLib (1).jar}
reporter=com.comphenix.protocol.ProtocolLib$1@1d0242fd
server=CraftServer{serverName=Paper,serverVersion=git-Paper-730,minecraftVersion=1.16.5}
library=ProtocolLib v4.6.0
asyncFilterManager=com.comphenix.protocol.async.AsyncFilterManager@3576617e
knowsServerPackets=true
knowsClientPackets=true
phaseLoginCount=0
phasePlayingCount=2
packetCreation=false
nettyInjector=com.comphenix.protocol.injector.netty.ProtocolInjector@6e4ad0f6
pluginVerifier=com.comphenix.protocol.injector.PluginVerifier@aa16218
hasRecycleDistance=true
minecraftVersion=(MC: 1.16.5)
debug=false
]
Sender:
com.comphenix.protocol.reflect.compiler.BackgroundCompiler@34c84cfd[
listeners={com.comphenix.protocol.reflect.compiler.StructureCompiler$StructureKey@5c33f2d2=[com.comphenix.protocol.injector.StructureCache$1@5590aaa2], com.comphenix.protocol.reflect.compiler.StructureCompiler$StructureKey@e471133e=[com.comphenix.protocol.injector.StructureCache$1@6de50d86]}
listenerLock=java.lang.Object@6c550380
compiler=com.comphenix.protocol.reflect.compiler.StructureCompiler@1a8c1553
enabled=false
shuttingDown=false
executor=java.util.concurrent.Executors$FinalizableDelegatedExecutorService@4a99791a
reporter=com.comphenix.protocol.ProtocolLib$1@1d0242fd
unknownPermGenBean=java.lang.Object@fd5c4f2
permGenBean=
disablePermGenFraction=0.65
]
Version:
ProtocolLib v4.6.0
Java Version:
16.0.1
Server:
git-Paper-730 (MC: 1.16.5)

Duplicate of #1162

This issue was resolved in build 499+.