该bug还未修复。早期的version从文件获取，当 version = "\"\"" 时，isSupportResponseAttachment
中的代码块if (StringUtils.isEmpty(version)) {
return false;
} 就失效了。也就是会报错如下：
11/28 15:03:45.504 WARN org.apache.dubbo.remoting.exchange.codec.ExchangeCodec
[NettyServerWorker-6-7] [DUBBO] Fail to encode response: Response [id=0,
version=client, status=20, event=false, error=null, result=AppResponse
[value=cn.pengh.core.rpc.RpcResponse@49995603, exception=null]], send
bad_response info instead, cause: For input string: "", dubbo version: 2.7.3,
current host: 192.168.6.46
java.lang.NumberFormatException: For input string: ""
at
java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
~[?:1.8.0_201]
at java.lang.Integer.parseInt(Integer.java:592) ~[?:1.8.0_201]
at java.lang.Integer.parseInt(Integer.java:615) ~[?:1.8.0_201]
at org.apache.dubbo.common.Version.parseInt(Version.java:133)
~[dubbo-2.7.3.jar:2.7.3]
at org.apache.dubbo.common.Version.getIntVersion(Version.java:118)
~[dubbo-2.7.3.jar:2.7.3]
at
org.apache.dubbo.common.Version.isSupportResponseAttachment(Version.java:102)
~[dubbo-2.7.3.jar:2.7.3]
at
org.apache.dubbo.rpc.protocol.dubbo.DubboCodec.encodeResponseData(DubboCodec.java:195)
~[dubbo-2.7.3.jar:2.7.3]
at
org.apache.dubbo.remoting.exchange.codec.ExchangeCodec.encodeResponse(ExchangeCodec.java:283)
[dubbo-2.7.3.jar:2.7.3]
at
org.apache.dubbo.remoting.exchange.codec.ExchangeCodec.encode(ExchangeCodec.java:71)
[dubbo-2.7.3.jar:2.7.3]
at
org.apache.dubbo.rpc.protocol.dubbo.DubboCountCodec.encode(DubboCountCodec.java:40)
[dubbo-2.7.3.jar:2.7.3]
at
org.apache.dubbo.remoting.transport.netty4.NettyCodecAdapter$InternalEncoder.encode(NettyCodecAdapter.java:70)
[dubbo-2.7.3.jar:2.7.3]
at
io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:716)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:708)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:791)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:701)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.handler.timeout.IdleStateHandler.write(IdleStateHandler.java:303)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:716)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:708)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:791)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:701)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.channel.ChannelDuplexHandler.write(ChannelDuplexHandler.java:115)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
org.apache.dubbo.remoting.transport.netty4.NettyServerHandler.write(NettyServerHandler.java:103)
[dubbo-2.7.3.jar:2.7.3]
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:716)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:708)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.channel.AbstractChannelHandlerContext.access$1700(AbstractChannelHandlerContext.java:56)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:1102)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1149)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:1073)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:510)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:518)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.util.concurrent.SingleThreadEventExecutor$6.run(SingleThreadEventExecutor.java:1050)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
[netty-all-4.1.43.Final.jar:4.1.43.Final]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_201]
[ Full content available at: https://github.com/apache/dubbo/issues/3784 ]
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