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InaccessibleObjectException on startup with Java 16

See original GitHub issue

[11:25:38] [Server thread/INFO]: [helper] Loading helper v5.6.7
[11:25:38] [Server thread/INFO]: [helper] helper (me.lucko.helper) bound to plugin helper - me.lucko.helper.internal.StandalonePlugin
[11:25:38] [Server thread/ERROR]: [org.bukkit.craftbukkit.v1_16_R3.CraftServer] null initializing helper v5.6.7 (Is it up to date?)
java.lang.ExceptionInInitializerError: null
        at me.lucko.helper.plugin.ExtendedJavaPlugin.onLoad(ExtendedJavaPlugin.java:78) ~[?:?]
        at org.bukkit.craftbukkit.v1_16_R3.CraftServer.loadPlugins(CraftServer.java:394) ~[patched_1.16.5.jar:git-Paper-629]
        at net.minecraft.server.v1_16_R3.DedicatedServer.init(DedicatedServer.java:252) ~[patched_1.16.5.jar:git-Paper-629]
        at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1065) ~[patched_1.16.5.jar:git-Paper-629]
        at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:289) ~[patched_1.16.5.jar:git-Paper-629]
        at java.lang.Thread.run(Thread.java:831) [?:?]
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected void java.net.URLClassLoader.addURL(java.net.URL) accessible: module java.base does not "opens java.net" to unnamed module @6f514ac
        at java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357) ~[?:?]
        at java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) ~[?:?]
        at java.lang.reflect.Method.checkCanSetAccessible(Method.java:199) ~[?:?]
        at java.lang.reflect.Method.setAccessible(Method.java:193) ~[?:?]
        at me.lucko.helper.maven.LibraryLoader.<clinit>(LibraryLoader.java:51) ~[?:?]
        ... 6 more

Paper 1.16.5 #654 Java 16 (OpenJDK 64-Bit Server VM 16.0.1+9-Ubuntu-120.04) Host: Linux 5.4.0-29-generic (amd64)

Issue Analytics

State:
Created 2 years ago
Comments:10 (2 by maintainers)

Top GitHub Comments

1reaction

PepejHa4kercommented, May 17, 2021

@GeorgeV220, the solution has already been provided, see above

1reaction

GeorgeV220commented, May 17, 2021

Hey, you can always add --add-opens java.base/java.net=ALL-UNNAMED for my test server i’m using java --add-opens java.base/java.net=ALL-UNNAMED --add-opens java.base/java.lang.invoke=ALL-UNNAMED -Xms128M -Xmx4096M -Dterminal.jline=false -Dterminal.ansi=true -jar purpur.jar

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