tanhaican opened a new issue #3097:
URL: https://github.com/apache/shardingsphere/issues/3097
## Bug Report
- There are 4 similar issues, but none of them are exactly like me
- I've tried after the document, but still can not solve the problem
### Which version of ShardingSphere did you use?
First, I tried
apache-shardingsphere-incubating-4.0.0-RC2-sharding-proxy-bin, Then, I build
myself from dev branch (2019-09-24)
### Which project did you use? Sharding-JDBC or Sharding-Proxy?
Sharding-Proxy
### Expected behavior
Connected successfully by SpringBoot Application with Druid Or HikariCP
Datasource
### Actual behavior
Connected successfully by Navicat (sometimes throws NullPointerException:
null, but still work)
Both of Druid or HikariCP in my SpringBoot Application start faild by
throwing "Failed to initialize pool: Unknown system variable 'query_cache_size'
"
### Reason analyze (If you can)
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule
configuration, when exception occur etc.
1. Sharding-Proxy (4.0.0-RC2) (config-sharding.yaml)
2. SprintBoot with Druid or HikariCP
3. MySQL 8.0.12
4. Tried mysql-connector-java-5.1.44、mysql-connector-java-8.0.17.jar in
SpringBoot application and sharding-proxy/lib，none of them works
### Example codes for reproduce this issue (such as a github link).
[config-sharding.yaml.txt](https://github.com/apache/incubator-shardingsphere/files/3645028/config-sharding.yaml.txt)
[server.yaml.txt](https://github.com/apache/incubator-shardingsphere/files/3645029/server.yaml.txt)
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