diqiu50 opened a new issue, #13583:
URL: https://github.com/apache/gravitino/issues/13583

   ### Version
   
   main branch
   
   ### Describe what's wrong
   
   For a jdbc-backed Iceberg catalog that is eligible for Iceberg REST routing, 
`GravitinoIcebergCatalog.createAndInitSparkCatalog` loads the catalog's 
`jdbc-driver` with `Class.forName` before deciding whether to route. When the 
catalog is routed, the Spark client only talks to the Iceberg REST server and 
never uses the backend driver. Even so, catalog initialization fails if the 
driver isn't on the Spark classpath.
   
   ### Error message and/or stacktrace
   
   ```
   java.lang.RuntimeException: java.lang.ClassNotFoundException: 
org.postgresql.Driver
       at 
org.apache.gravitino.spark.connector.iceberg.GravitinoIcebergCatalog.createAndInitSparkCatalog(GravitinoIcebergCatalog.java:83)
   ```
   
   ### How to reproduce
   
   1. Create an Iceberg catalog with `catalog-backend=jdbc`, 
`uri=jdbc:postgresql://...`, `jdbc-driver=org.postgresql.Driver`, 
`warehouse=s3://...`, `credential-providers=s3-token`.
   2. In Spark with the Gravitino connector and Iceberg support turned on, and 
without the PostgreSQL driver on the classpath, run `SHOW NAMESPACES IN 
<catalog>`.
   
   ### Additional context
   
   The driver preload should only apply on the legacy Hive/JDBC backend 
translation path.
   


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