Netty-无法访问类jdk.internal.misc.Unsafe [英] Netty- cannot access class jdk.internal.misc.Unsafe

问题描述

当我将Java从8升级到11时，我从Netty收到有关"jdk.internal.misc.Unsafe" 的错误，详细信息如下:

When I upgraded the Java from 8 to 11, I got an error from Netty about the "jdk.internal.misc.Unsafe", the details are below:

我知道这是一条调试级别消息，可以更改日志级别以忽略它.但是我不确定是否会忽略其他问题，例如性能.有谁知道最好的解决方案吗?

I knew it is a debug level message, and I can change the level of the log to ignore it. But I'm not sure if there would be other problems - such as performance - when I ignore it. Does anyone know the best solution to this?

java.lang.IllegalAccessException: class io.netty.util.internal.PlatformDependent0$6 cannot access class jdk.internal.misc.Unsafe (in module java.base) because module java.base does not export jdk.internal.misc to unnamed module @84b8f0f
    at jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:361) ~[?:?]
    at java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:591) ~[?:?]
    at java.lang.reflect.Method.invoke(Method.java:558) ~[?:?]
    at io.netty.util.internal.PlatformDependent0$6.run(PlatformDependent0.java:334) ~[netty-all-4.1.36.Final.jar:4.1.36.Final]
    at java.security.AccessController.doPrivileged(Native Method) ~[?:?]
    at io.netty.util.internal.PlatformDependent0.<clinit>(PlatformDependent0.java:325) ~[netty-all-4.1.36.Final.jar:4.1.36.Final]
    at io.netty.util.internal.PlatformDependent.isAndroid(PlatformDependent.java:214) ~[netty-all-4.1.36.Final.jar:4.1.36.Final]
    at io.netty.util.internal.PlatformDependent.<clinit>(PlatformDependent.java:82) ~[netty-all-4.1.36.Final.jar:4.1.36.Final]
    at io.netty.buffer.UnpooledByteBufAllocator.<clinit>(UnpooledByteBufAllocator.java:37) ~[netty-all-4.1.36.Final.jar:4.1.36.Final]
    at io.netty.buffer.Unpooled.<clinit>(Unpooled.java:73) ~[netty-all-4.1.36.Final.jar:4.1.36.Final]
    at wedo.stream3.framework.base.connector.supplier.DelimiterDecoderSupplier.getDelimiter(DelimiterDecoderSupplier.java:41) ~[classes/:?]
    at wedo.stream3.framework.base.connector.supplier.DelimiterDecoderSupplier.<init>(DelimiterDecoderSupplier.java:26) ~[classes/:?]
    at wedo.stream3.framework.base.connector.supplier.DelimiterDecoderSupplier.<init>(DelimiterDecoderSupplier.java:20) ~[classes/:?]
    at wedo.stream3.framework.base.connector.supplier.CommonChannelHandlerSupplier.<init>(CommonChannelHandlerSupplier.java:37) ~[classes/:?]
    at wedo.stream3.framework.base.connector.supplier.CommonChannelHandlerSupplier.<init>(CommonChannelHandlerSupplier.java:25) ~[classes/:?]
    at wedo.stream3.framework.base.connector.TcpClientConnector.start(TcpClientConnector.java:39) ~[classes/:?]
    at wedo.stream3.framework.bootstrap.FrameworkLauncher.lambda$start$0(FrameworkLauncher.java:61) ~[classes/:?]
    at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) [?:?]
    at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) [?:?]
    at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654) [?:?]
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) [?:?]
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) [?:?]
    at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) [?:?]
    at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) [?:?]
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) [?:?]
    at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) [?:?]
    at wedo.stream3.framework.bootstrap.FrameworkLauncher.start(FrameworkLauncher.java:58) [classes/:?]
    at org.stream3.prototype.mfc.App.launchFramework(App.java:58) [classes/:?]
    at org.stream3.prototype.mfc.App.main(App.java:41) [classes/:?]

推荐答案

要允许netty访问该类，请使用以下选项启动java:

To allow netty to access the class, start java with the following option:

--add-opens java.base/jdk.internal.misc=ALL-UNNAMED

这将打开模块 java.base 中的软件包 jdk.internal.misc 到未修改的模块.

This opens the package jdk.internal.misc in module java.base to the unamed module.

另请参见 java命令的文档，并且通常 Java模块系统简介

See also the documentation for the java command, and this intro to the Java module system in general.

要让Netty使用其直接缓冲区优化，还需要设置

For Netty to use its direct buffer optimizations, you also need to set

-Dio.netty.tryReflectionSetAccessible=true

与此主题相关的许多Netty问题，请参见例如 netty/issues/7769

There are a number of Netty issues on this subject, see e.g. netty/issues/7769

这篇关于Netty-无法访问类jdk.internal.misc.Unsafe的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！