sandynz commented on issue #13632:
URL:
https://github.com/apache/shardingsphere/issues/13632#issuecomment-971358788
I reproduced this exception in `StandardJDBCDataSourceConfigurationTest`,
new lines is added in `config_standard_jdbc_target.yaml`:
```
schema: null
driverClassName: null
```
Caused exception:
```
Caused by: java.lang.NullPointerException
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at
com.zaxxer.hikari.HikariConfig.attemptFromContextLoader(HikariConfig.java:899)
at
com.zaxxer.hikari.HikariConfig.setDriverClassName(HikariConfig.java:474)
... 38 more
```
It's caused by `driverClassName` null value.
But I didn't find this case before and don't know why there's
`driverClassName: null` in ZK.
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