让 Java 可以访问 ubuntu 服务器中的目录/文件

Question

i'm creating a Minecraft server but when i execute "java -Xmx3G -jar paper-1.19-81.jar nogui" i get the error: "java.nio.file.AccessDeniedException: ./Lobby/session.lock".

it work fine with sudo on the root user but i don't want to use it because of some security issues. Do anyone know how to let java have access to this file?

Starting org.bukkit.craftbukkit.Main
System Info: Java 17 (OpenJDK 64-Bit Server VM 17.0.4+8-Ubuntu-122.04) Host: Linux 5.15.0-43-generic (amd64)
Loading libraries, please wait...
[11:49:32 INFO]: Building unoptimized datafixer
[11:49:34 INFO]: Environment: authHost='https://authserver.mojang.com', accountsHost='https://api.mojang.com', sessionHost='https://sessionserver.mojang.com', servicesHost='https://api.minecraftservices.com', name='PROD'
[11:49:34 ERROR]: Failed to start the minecraft server
java.nio.file.AccessDeniedException: ./Lobby/session.lock
        at sun.nio.fs.UnixException.translateToIOException(UnixException.java:90) ~[?:?]
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106) ~[?:?]
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111) ~[?:?]
        at sun.nio.fs.UnixFileSystemProvider.newFileChannel(UnixFileSystemProvider.java:181) ~[?:?]
        at java.nio.channels.FileChannel.open(FileChannel.java:298) ~[?:?]
        at java.nio.channels.FileChannel.open(FileChannel.java:357) ~[?:?]
        at net.minecraft.util.DirectoryLock.create(DirectoryLock.java:26) ~[?:?]
        at net.minecraft.world.level.storage.LevelStorageSource$LevelStorageAccess.<init>(LevelStorageSource.java:398) ~[?:?]
        at net.minecraft.world.level.storage.LevelStorageSource.createAccess(LevelStorageSource.java:323) ~[?:?]
        at net.minecraft.server.Main.main(Main.java:156) ~[paper-1.19.jar:git-Paper-81]
        at org.bukkit.craftbukkit.Main.main(Main.java:294) ~[paper-1.19.jar:git-Paper-81]
        at io.papermc.paperclip.Paperclip.lambda$main$0(Paperclip.java:42) ~[app:?]
        at java.lang.Thread.run(Thread.java:833) ~[?:?]
mcserver@minersworld:~/minersworldserver$```

Answer 1

This most likely means that your server crashed and your world may be corrupted. Make a backup of the world directory, delete the lock file, and load up the server. If the world has some corrupted or reset chunks, you may have to load a backup of it you made previously that you have stored elsewhere.