当我将 Java 从 8 升级到 11 时，我收到来自 Netty 的错误："jdk.internal.misc.Unsafe"，详细信息如下：
我知道这是一条调试级别消息，我可以更改日志级别以忽略它。但我不确定当我忽略它时是否会出现其他问题 - 例如性能。有谁知道这个问题的最佳解决方案？
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/:?]
要允许 netty 访问该类，请使用以下选项启动 java：
--add-opens java.base/jdk.internal.misc=ALL-UNNAMED
这将打开包jdk.internal.misc在模块中java.base到未命名的模块。
另请参阅文档java命令 https://docs.oracle.com/en/java/javase/11/tools/java.html， 和这个Java 模块系统简介 https://www.oracle.com/corporate/features/understanding-java-9-modules.html一般来说。
编辑：为了让 Netty 使用其直接缓冲区优化，您还需要设置
-Dio.netty.tryReflectionSetAccessible=true
关于这个主题有许多 Netty 问题，请参见例如netty/问题/7769 https://github.com/netty/netty/issues/7769
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