JDK 26 includes support for the JDBC 4.5 MR. That MR provides the following updates to the JDBC Specification:

- Deprecate [SQLPermission] for removal
- Add the SQL types `DECFLOAT` and `JSON` to `JDBCType.java` and `Types.java`
- Enhance the `Array`, `Blob`, `Clob`, `Nclob`, and `SQLXML` interfaces to extend and support `AutoClosable`. This adds a default implementation of the `close` method which calls the `free` method.
- Add default implementations of the quoted identifier methods previously added to the [Statement] interface in JDK 9 to the [Connection] interface
  - The default implementation of [enquoteIdentifier][Statement.enquoteIdentifier] will throw a [SQLException] if [DatabaseMetaData::getIdentifierQuoteString] does not return a double quote
  - The default implementation of [isSimpleIdentifier][Statement.isSimpleIdentifier] will now return `false` if the String passed to the method is a SQL Standard reserved word

This update may have an impact on compatibility with some JDBC driver implementations:

- If there is an internal, that is private or protected, implementation of the newly added default methods, the implementation will need to either be renamed or made public
- A class cannot implement multiple interfaces that provide different default implementations of the same method. Implementations of these interfaces may need to override the default methods to resolve the ambiguity.