InaccessibleObjectException while using SDK 16

Question

InaccessibleObjectException while using SDK 16

TonyFoster opened this issue 3 years ago · 4 comments

TonyFoster commented 3 years ago

Env:
System Info: Java 16 (Java HotSpot(TM) 64-Bit Server VM 16.0.1+9-24) Host: ***
This server is running Paper version git-Paper-105 (MC: 1.17.1) (Implementing API version 1.17.1-R0.1-SNAPSHOT) (Git: 2e37979)
Starting minecraft server version 1.17.1
[NBTAPI] Enabling NBTAPI v2.8.1-SNAPSHOT

code:
nbtItem.setObject("key", player);

get:

Caused by: de.tr7zw.nbtapi.NbtApiException: Exception while setting the Object 'CraftPlayer{name=***}'!
        at de.tr7zw.nbtapi.NBTReflectionUtil.setObject(NBTReflectionUtil.java:517) ~[?:?]
        at de.tr7zw.nbtapi.NBTCompound.setObject(NBTCompound.java:421) ~[?:?]
        at ***(***.java:59) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[patched_1.17.1.jar:git-Paper-105]
        ... 21 more
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field private java.lang.Object java.lang.ref.Reference.referent accessible: module java.base does not "opens java.lang.ref" to unnamed module @2baf3d81
        at java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357) ~[?:?]
        at java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) ~[?:?]
        at java.lang.reflect.Field.checkCanSetAccessible(Field.java:177) ~[?:?]
        at java.lang.reflect.Field.setAccessible(Field.java:171) ~[?:?]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:157) ~[patched_1.17.1.jar:git-Paper-105]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:100) ~[patched_1.17.1.jar:git-Paper-105]
        at com.google.gson.Gson.getAdapter(Gson.java:423) ~[patched_1.17.1.jar:git-Paper-105]
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory.create(CollectionTypeAdapterFactory.java:53) ~[patched_1.17.1.jar:git-Paper-105]
        at com.google.gson.Gson.getAdapter(Gson.java:423) ~[patched_1.17.1.jar:git-Paper-105]
        at com.google.gson.internal.bind.MapTypeAdapterFactory.create(MapTypeAdapterFactory.java:126) ~[patched_1.17.1.jar:git-Paper-105]
        at com.google.gson.Gson.getAdapter(Gson.java:423) ~[patched_1.17.1.jar:git-Paper-105]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:115) ~[patched_1.17.1.jar:git-Paper-105]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:164) ~[patched_1.17.1.jar:git-Paper-105]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:100) ~[patched_1.17.1.jar:git-Paper-105]
        at com.google.gson.Gson.getAdapter(Gson.java:423) ~[patched_1.17.1.jar:git-Paper-105]
        at com.google.gson.Gson.toJson(Gson.java:661) ~[patched_1.17.1.jar:git-Paper-105]
        at com.google.gson.Gson.toJson(Gson.java:648) ~[patched_1.17.1.jar:git-Paper-105]
        at com.google.gson.Gson.toJson(Gson.java:603) ~[patched_1.17.1.jar:git-Paper-105]
        at com.google.gson.Gson.toJson(Gson.java:583) ~[patched_1.17.1.jar:git-Paper-105]
        at de.tr7zw.nbtapi.utils.GsonWrapper.getString(GsonWrapper.java:31) ~[?:?]
        at de.tr7zw.nbtapi.NBTReflectionUtil.setObject(NBTReflectionUtil.java:514) ~[?:?]
        at de.tr7zw.nbtapi.NBTCompound.setObject(NBTCompound.java:421) ~[?:?]
        at ***(***.java:59) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[patched_1.17.1.jar:git-Paper-105]
        ... 21 more

reference:
https://stackoverflow.com/questions/41265266

TonyFoster · Answer 1 · 2021-07-24T12:30:01.000Z

But nbtItem.setObject("key", Instant.now()); won't work too, so I have to use java.sql.Timestamp instead.

tr7zw · Answer 2 · 2021-07-24T19:38:09.000Z

Tme should be long or a formatted String, not an Instant, Callender or Timestamp. Like I said, it uses Gson, so don't try to put stuff into there that you also woun't try to serialize directly. Especially if there is a simple format for it (for example long for time). The setObject method should only ever be used to save POJO classes.

TonyFoster · Answer 3 · 2021-07-24T08:52:26.000Z

Perhaps there is nothing we can do with this matter?

tr7zw · Answer 4 · 2021-07-24T12:10:07.000Z

Hm could it be that you have reflection security features active on the java 16 jvm(try --illegal-access=permit?

Edit: Scratch that, just saw the the code you try to run nbtItem.setObject("key", player);, yea that will never work. Never pass Minecraft objects into gson (the get/set object methods are just gson wrappers), because you basically try to convert the ENTIRE running server into json and put it onto an item.

Share to