- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate. - [ ] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.
### Environment * Dubbo version: 2.6.0 * Operating System version: centos 6 * Java version: jdk 1.8 ### Steps to reproduce this issue 1. 服务端dubbo 2.7 客户端使用2.6.0 由于集群原因升级到2.7之后zk的curator客户端会造成任务卡住,所以无法升级 2. ause: java.lang.NumberFormatException: For input string: "" java.lang.NumberFormatException: For input string: "" at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) at java.lang.Integer.parseInt(Integer.java:592) at java.lang.Integer.parseInt(Integer.java:615) at org.apache.dubbo.common.Version.parseInt(Version.java:128) at org.apache.dubbo.common.Version.getIntVersion(Version.java:113) at org.apache.dubbo.common.Version.isSupportResponseAttachment(Version.java:102) [ Full content available at: https://github.com/apache/dubbo/issues/5048 ] This message was relayed via gitbox.apache.org for notifications@dubbo.apache.org
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