Qianyi951015 opened a new issue, #20513:
URL: https://github.com/apache/shardingsphere/issues/20513
## Bug Report
### Which version of ShardingSphere did you use?
master 6cf1f1e8352d7be5c501a5626ef44e708a5b0d2b
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere-Proxy
### Expected behavior
ADD RESOURCE success.
### Actual behavior
Got an exception and ADD RESOURCE failed.
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule
configuration, when exception occur etc.
1. Add resources `ds_0`, `ds_1`, `ds_2`.
```
add resource
ds_0(url="jdbc:mysql://xxx.xx.xx.xx:33306/primary_demo_ds?serverTimezone=UTC&useSSL=false",
user="root",password="xxxxxx"),
ds_1(url="jdbc:mysql://xxx.xx.xx.xx:33307/primary_demo_ds?serverTimezone=UTC&useSSL=false",
user="root",password="xxxxxx"),
ds_2(url="jdbc:mysql://xxx.xx.xx.xx:33308/primary_demo_ds?serverTimezone=UTC&useSSL=false",
user="root",password="xxxxxx");
```
2. Create database discover rule `group0`.
```
CREATE DB_DISCOVERY RULE group_0 ( RESOURCES(ds_0, ds_1, ds_2),
TYPE(NAME='MySQL.MGR',PROPERTIES('group-name'='558edd3c-02ec-11ea-9bb3-080027e39bd2')),
HEARTBEAT(PROPERTIES('keep-alive-cron'='0/5 * * * * ?')) );
```
3. Add resource `resource_0`.
```
ADD RESOURCE resource_0 (
HOST="127.0.0.1",
PORT=3306,
DB="db0",
USER="root",
PASSWORD="123456"
);
```
### Log
```
ERROR 1999 (42000): Unknown exception: java.lang.NullPointerException
```
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