6 files declare their use of ExceptionHandler

Connection.php in core/modules/sqlite/src/Driver/Database/sqlite/Connection.php
Connection.php in core/modules/pgsql/src/Driver/Database/pgsql/Connection.php
Connection.php in core/tests/fixtures/database_drivers/custom/fake/Connection.php
ExceptionHandler.php in core/modules/mysql/src/Driver/Database/mysql/ExceptionHandler.php
ExceptionHandler.php in core/tests/fixtures/database_drivers/module/core_fake/src/Driver/Database/CoreFakeWithAllCustomClasses/ExceptionHandler.php
StubConnection.php in core/tests/Drupal/Tests/Core/Database/Stub/StubConnection.php

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.