yx9o opened a new issue #11242:
URL: https://github.com/apache/shardingsphere/issues/11242
**description:**
Spring boot 2.x does not support underscores in attribute names. In the
official documentation of ss, there are underscores in attribute names in the
configuration of the fragmentation algorithm, such as:
```
# Configure sharding algorithm
spring.shardingsphere.rules.sharding.sharding-algorithms.database_inline.type=INLINE
spring.shardingsphere.rules.sharding.sharding-algorithms.database_inline.props.algorithm-expression=ds_${user_id%
2}
spring.shardingsphere.rules.sharding.sharding-algorithms.table_inline.type=INLINE
spring.shardingsphere.rules.sharding.sharding-algorithms.table_inline.props.algorithm-expression=t_order_${order_id%
2}
```
I think database_inline and table_inline need to be adjusted and cannot
contain underscores, because such a configuration will report an error when it
starts. The error is as follows:
```
ss error: Preconditions.checkNotNull(expression, "Inline sharding algorithm
expression cannot be null.");
springboot error: "Configuration property name'" + name + "'is not valid".
```
I think the error report of springboot is clearer, and the user can know
which attribute in the configuration is wrong or invalid.
and so,
I expect to be able to output the springboot error in the catch of the
PropertyUtil.containPropertyPrefix(final Environment environment, final String
prefix) method. And adjust the underline in the document.
Welcome to leave a comment and discuss.
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