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使用 vertx Web 客户端版本 4.0.0 时出现 java.lang.IllegalAccessError

分类：编程问答

如何解决使用 vertx Web 客户端版本 4.0.0 时出现 java.lang.IllegalAccessError

将 vertx 4.0.0 与 jdk 14 一起使用。尝试使用 vertx Web 客户端发出 REST 请求时出现以下异常：

15:56:48.294 [vert.x-eventloop-thread-0] ERROR io.vertx.core.impl.ContextImpl - Unhandled exception
java.lang.IllegalAccessError: class io.vertx.core.buffer.impl.VertxUnsafeHeapByteBuf cannot access its superclass io.netty.buffer.UnpooledUnsafeHeapByteBuf (io.vertx.core.buffer.impl.VertxUnsafeHeapByteBuf and io.netty.buffer.UnpooledUnsafeHeapByteBuf are in unnamed module of loader 'app')
        at java.lang.classLoader.defineClass1(Native Method) ~[?:?]
        at java.lang.classLoader.defineClass(ClassLoader.java:1017) ~[?:?]
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151) ~[?:?]
        at jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:821) ~[?:?]
        at jdk.internal.loader.BuiltinClassLoader.findClassOnClasspathOrNull(BuiltinClassLoader.java:719) ~[?:?]
        at jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:642) ~[?:?]
        at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:600) ~[?:?]
        at jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[?:?]
        at java.lang.classLoader.loadClass(ClassLoader.java:522) ~[?:?]
        at io.vertx.core.buffer.impl.VertxByteBufAllocator.<clinit>(VertxByteBufAllocator.java:20) ~[vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.buffer.impl.BufferImpl.<init>(BufferImpl.java:64) ~[vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.buffer.impl.BufferImpl.<init>(BufferImpl.java:60) ~[vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.buffer.impl.BufferImpl.buffer(BufferImpl.java:38) ~[vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.buffer.Buffer.buffer(Buffer.java:49) ~[vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.ext.web.codec.impl.BodyCodecImpl$1.<init>(BodyCodecImpl.java:88) ~[vertx-web-common-4.0.0.jar:4.0.0]
        at io.vertx.ext.web.codec.impl.BodyCodecImpl.create(BodyCodecImpl.java:86) ~[vertx-web-common-4.0.0.jar:4.0.0]
        at io.vertx.ext.web.client.impl.HttpContext.handleReceiveResponse(HttpContext.java:427) ~[vertx-web-client-4.0.0.jar:4.0.0]
        at io.vertx.ext.web.client.impl.HttpContext.execute(HttpContext.java:338) ~[vertx-web-client-4.0.0.jar:4.0.0]
        at io.vertx.ext.web.client.impl.HttpContext.next(HttpContext.java:322) ~[vertx-web-client-4.0.0.jar:4.0.0]
        at io.vertx.ext.web.client.impl.HttpContext.fire(HttpContext.java:289) ~[vertx-web-client-4.0.0.jar:4.0.0]
        at io.vertx.ext.web.client.impl.HttpContext.receiveResponse(HttpContext.java:238) ~[vertx-web-client-4.0.0.jar:4.0.0]
        at io.vertx.ext.web.client.impl.HttpContext.lambda$null$13(HttpContext.java:564) ~[vertx-web-client-4.0.0.jar:4.0.0]
        at io.vertx.core.impl.future.FutureImpl$3.onSuccess(FutureImpl.java:125) ~[vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.impl.future.FutureBase.emitSuccess(FutureBase.java:61) ~[vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.impl.future.FutureImpl.tryComplete(FutureImpl.java:180) ~[vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.impl.future.PromiseImpl.tryComplete(PromiseImpl.java:23) ~[vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.Promise.complete(Promise.java:66) ~[vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.http.impl.HttpClientRequestImpl.handleResponse(HttpClientRequestImpl.java:350) ~[vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.http.impl.HttpClientRequestBase.handleResponse(HttpClientRequestBase.java:185) ~[vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.http.impl.HttpClientRequestBase.lambda$new$0(HttpClientRequestBase.java:71) ~[vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.impl.EventLoopContext.emit(EventLoopContext.java:52) [vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.impl.ContextImpl.emit(ContextImpl.java:294) [vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.impl.EventLoopContext.emit(EventLoopContext.java:24) [vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.http.impl.Http1xClientConnection$StreamImpl.handleHead(Http1xClientConnection.java:537) [vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.http.impl.Http1xClientConnection.handleResponseBegin(Http1xClientConnection.java:695) [vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.http.impl.Http1xClientConnection.handleHttpMessage(Http1xClientConnection.java:628) [vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.http.impl.Http1xClientConnection.handleMessage(Http1xClientConnection.java:602) [vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.net.impl.ConnectionBase.read(ConnectionBase.java:151) [vertx-core-4.0.0.jar:4.0.0]
        at io.vertx.core.net.impl.VertxHandler.channelRead(VertxHandler.java:144) [vertx-core-4.0.0.jar:4.0.0]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:337) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.handler.codec.MessagetoMessageDecoder.channelRead(MessagetoMessageDecoder.java:102) [netty-codec-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:337) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:438) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.handler.codec.BytetoMessageDecoder.fireChannelRead(BytetoMessageDecoder.java:323) [netty-codec-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.handler.codec.BytetoMessageDecoder.fireChannelRead(BytetoMessageDecoder.java:310) [netty-codec-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.handler.codec.BytetoMessageDecoder.callDecode(BytetoMessageDecoder.java:426) [netty-codec-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.handler.codec.BytetoMessageDecoder.channelRead(BytetoMessageDecoder.java:278) [netty-codec-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:253) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:337) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1476) [netty-handler-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1225) [netty-handler-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1272) [netty-handler-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.handler.codec.BytetoMessageDecoder.decodeRemovalReentryProtection(BytetoMessageDecoder.java:502) [netty-codec-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.handler.codec.BytetoMessageDecoder.callDecode(BytetoMessageDecoder.java:441) [netty-codec-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.handler.codec.BytetoMessageDecoder.channelRead(BytetoMessageDecoder.java:278) [netty-codec-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:337) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1408) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:930) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:677) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:612) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:529) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:491) [netty-transport-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:905) [netty-common-4.1.34.Final.jar:4.1.34.Final]
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [netty-common-4.1.34.Final.jar:4.1.34.Final]
        at java.lang.Thread.run(Thread.java:832) [?:?]

更仔细地查看错误似乎确实 Vertx 类 VertxUnsafeHeapByteBuf 是从具有包级别访问级别的 Netty 类 UnpooledUnsafeHeapByteBuf 继承的。 （换句话说，它不是公共课程） Netty 库版本 maven 将其解析为“4.1.34.Final”。

我尝试排除此版本的 Netty 库并使用具有公共访问器的 UnpooledUnsafeHeapByteBuf 类的较新版本。 所以我使用了最新的“4.1.58.Final”，虽然我不再获得 IllegalAccessError 不幸的是它仍然无法使用以下堆栈跟踪：

io.netty.resolver.dns.DnsResolveContext$SearchDomainUnkNownHostException: Search domain query Failed. Original hostname: 'usapi.alibaba.com' Failed to resolve 'usapi.alibaba.com' after 2 queries 
    at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:877)
    at io.netty.resolver.dns.DnsResolveContext.tryToFinishResolve(DnsResolveContext.java:838)
    at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:333)
    at io.netty.resolver.dns.DnsResolveContext.access$600(DnsResolveContext.java:63)
    at io.netty.resolver.dns.DnsResolveContext$3.operationComplete(DnsResolveContext.java:382)
    at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:502)
    at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:476)
    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:415)
    at io.netty.util.concurrent.DefaultPromise.addListener(DefaultPromise.java:152)
    at io.netty.util.concurrent.DefaultPromise.addListener(DefaultPromise.java:33)
    at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:357)
    at io.netty.resolver.dns.DnsResolveContext.access$600(DnsResolveContext.java:63)
    at io.netty.resolver.dns.DnsResolveContext$3.operationComplete(DnsResolveContext.java:382)
    at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:502)
    at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:476)
    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:415)
    at io.netty.util.concurrent.DefaultPromise.addListener(DefaultPromise.java:152)
    at io.netty.util.concurrent.DefaultPromise.addListener(DefaultPromise.java:33)
    at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:357)
    at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:951)
    at io.netty.resolver.dns.DnsResolveContext.internalResolve(DnsResolveContext.java:270)
    at io.netty.resolver.dns.DnsResolveContext.doSearchDomainQuery(DnsResolveContext.java:245)
    at io.netty.resolver.dns.DnsAddressResolveContext.doSearchDomainQuery(DnsAddressResolveContext.java:98)
    at io.netty.resolver.dns.DnsResolveContext.resolve(DnsResolveContext.java:212)
    at io.netty.resolver.dns.DnsNameResolver.doResolveAllUncached0(DnsNameResolver.java:995)
    at io.netty.resolver.dns.DnsNameResolver.doResolveAllUncached(DnsNameResolver.java:974)
    at io.netty.resolver.dns.DnsNameResolver.doResolveUncached(DnsNameResolver.java:879)
    at io.netty.resolver.dns.DnsNameResolver.doResolve(DnsNameResolver.java:829)
    at io.netty.resolver.dns.DnsNameResolver.doResolve(DnsNameResolver.java:672)
    at io.netty.resolver.SimpleNameResolver.resolve(SimpleNameResolver.java:63)
    at io.netty.resolver.dns.InflightNameResolver.resolve(InflightNameResolver.java:100)
    at io.netty.resolver.dns.InflightNameResolver.resolve(InflightNameResolver.java:66)
    at io.netty.resolver.dns.InflightNameResolver.resolve(InflightNameResolver.java:51)
    at io.netty.resolver.InetSocketAddressResolver.doResolve(InetSocketAddressResolver.java:57)
    at io.netty.resolver.InetSocketAddressResolver.doResolve(InetSocketAddressResolver.java:32)
    at io.netty.resolver.AbstractAddressResolver.resolve(AbstractAddressResolver.java:108)
    at io.netty.bootstrap.Bootstrap.doResolveAndConnect0(Bootstrap.java:208)
    at io.netty.bootstrap.Bootstrap.doResolveAndConnect(Bootstrap.java:170)
    at io.netty.bootstrap.Bootstrap.connect(Bootstrap.java:145)
    at io.vertx.core.net.impl.ChannelProvider.handleConnect(ChannelProvider.java:137)
    at io.vertx.core.net.impl.ChannelProvider.connect(ChannelProvider.java:90)
    at io.vertx.core.net.impl.ChannelProvider.connect(ChannelProvider.java:76)
    at io.vertx.core.http.impl.HttpChannelConnector.doConnect(HttpChannelConnector.java:145)
    at io.vertx.core.http.impl.HttpChannelConnector.connect(HttpChannelConnector.java:120)
    at io.vertx.core.net.impl.clientconnection.Pool$Holder.connect(Pool.java:126)
    at io.vertx.core.net.impl.clientconnection.Pool.checkPendingTasks(Pool.java:243)
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:495)
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:905)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: io.netty.resolver.dns.DnsNameResolverException: [/8.8.4.4:53] Failed to send a query (no stack trace available)
Caused by: io.netty.handler.codec.EncoderException: java.lang.NoClassDefFoundError: io/netty/util/internal/ObjectPool$ObjectCreator
    at io.netty.handler.codec.MessagetoMessageEncoder.write(MessagetoMessageEncoder.java:107)
    at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:706)
    at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:753)
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:778)
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:747)
    at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1031)
    at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:310)
    at io.netty.resolver.dns.DnsQueryContext.writeQuery(DnsQueryContext.java:139)
    at io.netty.resolver.dns.DnsQueryContext.sendQuery(DnsQueryContext.java:118)
    at io.netty.resolver.dns.DnsQueryContext.query(DnsQueryContext.java:113)
    at io.netty.resolver.dns.DnsNameResolver.query0(DnsNameResolver.java:1109)
    at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:351)
    at io.netty.resolver.dns.DnsResolveContext.access$600(DnsResolveContext.java:63)
    at io.netty.resolver.dns.DnsResolveContext$3.operationComplete(DnsResolveContext.java:382)
    at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:502)
    at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:476)
    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:415)
    at io.netty.util.concurrent.DefaultPromise.addListener(DefaultPromise.java:152)
    at io.netty.util.concurrent.DefaultPromise.addListener(DefaultPromise.java:33)
    at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:357)
    at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:951)
    at io.netty.resolver.dns.DnsResolveContext.internalResolve(DnsResolveContext.java:270)
    at io.netty.resolver.dns.DnsResolveContext.doSearchDomainQuery(DnsResolveContext.java:245)
    at io.netty.resolver.dns.DnsAddressResolveContext.doSearchDomainQuery(DnsAddressResolveContext.java:98)
    at io.netty.resolver.dns.DnsResolveContext.resolve(DnsResolveContext.java:212)
    at io.netty.resolver.dns.DnsNameResolver.doResolveAllUncached0(DnsNameResolver.java:995)
    at io.netty.resolver.dns.DnsNameResolver.doResolveAllUncached(DnsNameResolver.java:974)
    at io.netty.resolver.dns.DnsNameResolver.doResolveUncached(DnsNameResolver.java:879)
    at io.netty.resolver.dns.DnsNameResolver.doResolve(DnsNameResolver.java:829)
    at io.netty.resolver.dns.DnsNameResolver.doResolve(DnsNameResolver.java:672)
    at io.netty.resolver.SimpleNameResolver.resolve(SimpleNameResolver.java:63)
    at io.netty.resolver.dns.InflightNameResolver.resolve(InflightNameResolver.java:100)
    at io.netty.resolver.dns.InflightNameResolver.resolve(InflightNameResolver.java:66)
    at io.netty.resolver.dns.InflightNameResolver.resolve(InflightNameResolver.java:51)
    at io.netty.resolver.InetSocketAddressResolver.doResolve(InetSocketAddressResolver.java:57)
    at io.netty.resolver.InetSocketAddressResolver.doResolve(InetSocketAddressResolver.java:32)
    at io.netty.resolver.AbstractAddressResolver.resolve(AbstractAddressResolver.java:108)
    at io.netty.bootstrap.Bootstrap.doResolveAndConnect0(Bootstrap.java:208)
    at io.netty.bootstrap.Bootstrap.doResolveAndConnect(Bootstrap.java:170)
    at io.netty.bootstrap.Bootstrap.connect(Bootstrap.java:145)
    at io.vertx.core.net.impl.ChannelProvider.handleConnect(ChannelProvider.java:137)
    at io.vertx.core.net.impl.ChannelProvider.connect(ChannelProvider.java:90)
    at io.vertx.core.net.impl.ChannelProvider.connect(ChannelProvider.java:76)
    at io.vertx.core.http.impl.HttpChannelConnector.doConnect(HttpChannelConnector.java:145)
    at io.vertx.core.http.impl.HttpChannelConnector.connect(HttpChannelConnector.java:120)
    at io.vertx.core.net.impl.clientconnection.Pool$Holder.connect(Pool.java:126)
    at io.vertx.core.net.impl.clientconnection.Pool.checkPendingTasks(Pool.java:243)
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:495)
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:905)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.NoClassDefFoundError: io/netty/util/internal/ObjectPool$ObjectCreator
    at io.netty.buffer.PoolThreadCache.createSubPageCaches(PoolThreadCache.java:117)
    at io.netty.buffer.PoolThreadCache.<init>(PoolThreadCache.java:74)
    at io.netty.buffer.PooledByteBufAllocator$PoolThreadLocalCache.initialValue(PooledByteBufAllocator.java:499)
    at io.netty.buffer.PooledByteBufAllocator$PoolThreadLocalCache.initialValue(PooledByteBufAllocator.java:483)
    at io.netty.util.concurrent.FastThreadLocal.initialize(FastThreadLocal.java:188)
    at io.netty.util.concurrent.FastThreadLocal.get(FastThreadLocal.java:142)
    at io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:373)
    at io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:187)
    at io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:178)
    at io.netty.buffer.AbstractByteBufAllocator.ioBuffer(AbstractByteBufAllocator.java:139)
    at io.netty.handler.codec.dns.DatagramDnsQueryEncoder.allocateBuffer(DatagramDnsQueryEncoder.java:86)
    at io.netty.handler.codec.dns.DatagramDnsQueryEncoder.encode(DatagramDnsQueryEncoder.java:62)
    at io.netty.handler.codec.dns.DatagramDnsQueryEncoder.encode(DatagramDnsQueryEncoder.java:35)
    at io.netty.handler.codec.MessagetoMessageEncoder.write(MessagetoMessageEncoder.java:89)
    ... 52 more
Caused by: java.lang.classNotFoundException: io.netty.util.internal.ObjectPool$ObjectCreator
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
    at java.base/java.lang.classLoader.loadClass(ClassLoader.java:522)
    ... 66 more

解决方法

直到 vert.x 发布针对此问题的修复程序。目前 Aniket Sahrawat 提出的建议解决了这个问题。这是在您的 POM 文件中包含以下依赖项：

<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId>
    <version>4.1.48.Final</version>
</dependency>
,

从您上次的堆栈跟踪来看，您似乎在类路径上有多个 netty 版本。确保它们都具有相同的版本（在本例中为 4.1.58.Final）。

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