服务端从2.5.8升级到2.7.3后，客户端使用老版本调用服务端，Version.getIntVersion报错，响应失败

[penghcn]

• I have searched the issues of this repository and believe that this is not a duplicate.
• I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

• Dubbo version: 2.7.3
• Operating System version: macOS 10.15.1、任意Linux发行版
• Java version: 1.8

参考#3784，Version.parseInt未再判断字符串的合法性，也未做异常处理

该bug还未修复。version从文件名获取，当文件名是dubbo-client.jar，解析得到version = "client" 时，isSupportResponseAttachment(Version.java:102) 中的代码块
if (StringUtils.isEmpty(version)) {
return false;
}
就失效了。
后续Version.parseInt未再判断字符串的合法性，也未做异常处理。
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]

[penghcn]

客户端依赖的jar包文件名是dubbo-client.jar ，里面的pom文件版本写的是0.0.1-SNAPSHOT的时候。
把文件名dubbo-client.jar 改成 dubbo-client-0.0.1-SNAPSHOT.jar 也是可以正常使用的

[penghcn]

客户端文件名是dubbo-client.jar ，解析到的版本号是client

[chickenlj]

#4488
The compatibility code has been added to v2.6.7 and the latest v2.7.4.1.

[chickenlj]

for versions before 2.7.3, it only considers versions with the following format as legal:

1. versions only contain consist of digital numbers, 2.0.0
2. versions with string suffix like "2.6.7-stable" "0.0.1-SNAPSHOT".

Notice that if you are using Dubbo before v2.6.2, the version value is the same as the jar version.

[penghcn]

好的，多谢