dubbo提供者报错Decode argument[1] failed: java.lang.String cannot be cast to java.util.SortedMap

最新推荐文章于 2023-07-01 15:39:43 发布

原创最新推荐文章于 2023-07-01 15:39:43 发布 · 2k 阅读

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本文详细解析了Dubbo框架在调用过程中出现的ClassCastException和KryoException异常原因，涉及jar包版本冲突和泛型擦除问题，并提供了具体的解决步骤。

dubbo消费者在启动的过程中，提供者报错如下：

[11:14:12|WARN |(com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcInvocation)]=[ [DUBBO] Decode argument[1] failed: java.lang.String cannot be cast to java.util.SortedMap, dubbo version: 2.8.3, current host: 127.0.0.1]
java.lang.ClassCastException: java.lang.String cannot be cast to java.util.SortedMap
   at de.javakaffee.kryoserializers.SynchronizedCollectionsSerializer$SynchronizedCollection$7.create(SynchronizedCollectionsSerializer.java:148)
   at de.javakaffee.kryoserializers.SynchronizedCollectionsSerializer.read(SynchronizedCollectionsSerializer.java:71)
   at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761)
   at com.alibaba.dubbo.common.serialize.support.kryo.KryoObjectInput.readObject(KryoObjectInput.java:125)
   at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcInvocation.decode(DecodeableRpcInvocation.java:117)
   at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcInvocation.decode(DecodeableRpcInvocation.java:74)
   at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.decodeBody(DubboCodec.java:140)
   at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:134)
   at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:95)
   at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec.decode(DubboCountCodec.java:46)
   at com.alibaba.dubbo.remoting.transport.netty.NettyCodecAdapter$InternalDecoder.messageReceived(NettyCodecAdapter.java:134)
   at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
   at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
   at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
   at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
   at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
   at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
   at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:109)
   at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:312)
   at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:90)
   at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
   at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
   at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
   at java.lang.Thread.run(Thread.java:748)
[11:14:12|WARN |(com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcInvocation)]=[ [DUBBO] Decode argument[11] failed: com.esotericsoftware.kryo.KryoException: Buffer underflow., dubbo version: 2.8.3, current host: 127.0.0.1]
java.io.IOException: com.esotericsoftware.kryo.KryoException: Buffer underflow.
   at com.alibaba.dubbo.common.serialize.support.kryo.KryoObjectInput.readObject(KryoObjectInput.java:127)
   at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcInvocation.decode(DecodeableRpcInvocation.java:117)
   at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcInvocation.decode(DecodeableRpcInvocation.java:74)
   at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.decodeBody(DubboCodec.java:140)
   at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:134)
   at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:95)
   at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec.decode(DubboCountCodec.java:46)
   at com.alibaba.dubbo.remoting.transport.netty.NettyCodecAdapter$InternalDecoder.messageReceived(NettyCodecAdapter.java:134)
   at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
   at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
   at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
   at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
   at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
   at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
   at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:109)
   at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:312)
   at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:90)
   at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
   at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
   at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
   at java.lang.Thread.run(Thread.java:748)
Caused by: com.esotericsoftware.kryo.KryoException: Buffer underflow.
   at com.esotericsoftware.kryo.io.Input.require(Input.java:181)
   at com.esotericsoftware.kryo.io.Input.readVarInt(Input.java:355)
   at com.esotericsoftware.kryo.util.DefaultClassResolver.readClass(DefaultClassResolver.java:109)
   at com.esotericsoftware.kryo.Kryo.readClass(Kryo.java:641)
   at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:752)
   at com.alibaba.dubbo.common.serialize.support.kryo.KryoObjectInput.readObject(KryoObjectInput.java:125)
   ... 22 more

并且飞速打印出大量错误日志，查阅提供者日志后初步判断可能是jar包冲突。

跟进NettyCodecAdapter$InternalDecoder.messageReceived方法一层层查看源码，最终在Kryo.readClassAndObject方法中发现代码

registration.getSerializer().read(this, input, type);

即上面日志中打印的SynchronizedCollectionsSerializer.read方法，进入SynchronizedCollectionsSerializer类后发现源码编译期报泛型擦除错误，没能重写父类Serializer的read方法。

SynchronizedCollectionsSerializer类属于jar包kryo-serializers，版本号0.45，猜测是版本问题。

解决办法：修改版本为0.42，问题解决