Type 'java.sql.Wrapper' does not have type parameters原因

The reason for "Type 'java.sql.Wrapper' does not have type parameters" error is that the Java.sql.Wrapper interface does not have any type parameters defined in it.

This error usually occurs when a programmer tries to use a type parameter with the Wrapper interface. In such cases, the compiler throws an error as the Wrapper interface does not support any type parameters.

To resolve this error, the programmer needs to remove the type parameter from the Wrapper interface and use a different interface or class that supports type parameters.