jovezhong opened a new issue, #6646:
URL: https://github.com/apache/gravitino/issues/6646
### Version
main branch
### Describe what's wrong
I am using Aiven for Postgres and copied the JDBC URL which includes user
name and password
I put this in rest server conf
and got NullPointer error to list namespace
I think it will be better to use the JDBC url to try to connect and if it
failed, then check whether the jdbc.user is set or not.
### Error message and/or stacktrace
```json
{"error":{"message":"jdbc.user is
null","type":"NullPointerException","code":500,"stack":["java.lang.NullPointerException:
jdbc.user is null","\tat
com.google.common.base.Preconditions.checkNotNull(Preconditions.java:921)","\tat
org.apache.gravitino.iceberg.common.utils.IcebergCatalogUtil.loadJdbcCatalog(IcebergCatalogUtil.java:124)","\tat
org.apache.gravitino.iceberg.common.utils.IcebergCatalogUtil.loadCatalogBackend(IcebergCatalogUtil.java:191)","\tat
org.apache.gravitino.iceberg.common.ops.IcebergCatalogWrapper.<init>(IcebergCatalogWrapper.java:89)","\tat
org.apache.gravitino.iceberg.service.CatalogWrapperForREST.<init>(CatalogWrapperForREST.java:73
```
### How to reproduce
```
gravitino.iceberg-rest.catalog-backend = jdbc
gravitino.iceberg-rest.catalog-backend-name = public
gravitino.iceberg-rest.jdbc-driver = org.postgresql.Driver
gravitino.iceberg-rest.uri =
jdbc:postgresql://demo-timeplus.aivencloud.com:28851/defaultdb?ssl=require&user=avnadmin&password=AVNS123
#gravitino.iceberg-rest.jdbc-user = avnadmin
#gravitino.iceberg-rest.jdbc-password =
```
### Additional context
_No response_
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