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via GitHub by year520
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This exception has no message.
java.lang.NullPointerException: 	at com.google.common.collect.SingletonImmutableMap.(SingletonImmutableMap.java:47)	at com.google.common.collect.SingletonImmutableMap$bc1.newInstance(SingletonImmutableMap$bc1.java)	at com.alibaba.dubbo.common.serialize.support.dubbo.Builder$AbstractObjectBuilder.parseFrom(Builder.java:962)	at com.alibaba.dubbo.common.serialize.support.dubbo.GenericObjectInput.readObject(GenericObjectInput.java:93)	at com.alibaba.dubbo.common.serialize.support.dubbo.GenericObjectInput.readObject(GenericObjectInput.java:104)	at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcInvocation.decode(DecodeableRpcInvocation.java:109)	at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcInvocation.decode(DecodeableRpcInvocation.java:71)	at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.decodeBody(DubboCodec.java:137)	at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:126)	at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:87)	at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec.decode(DubboCountCodec.java:46)	at com.alibaba.dubbo.remoting.transport.netty.NettyCodecAdapter$InternalDecoder.messageReceived(NettyCodecAdapter.java:134)	at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:80)	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:274)	at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:261)	at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:349)	at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:280)	at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:200)	at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)	at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:44)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)