---
title: "Deprecation: #85821 - bootstrap methods"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:deprecation-85821"
source: "Changelog/9.4/Deprecation-85821-BootstrapMethods.rst"
modified: "2026-09-15T10:46:36+00:00"
---

# Deprecation: #85821 - bootstrap methods

See [forge#85821](https://forge.typo3.org/issues/85821)

## Description

The following methods of `\TYPO3\CMS\Core\Core\Bootstrap` have been marked as deprecated. Some of
them will just change their visibility from public to protected in TYPO3 v10 and thus should not
be called externally any longer:

-   `TYPO3\CMS\Core\Core\Bootstrap::usesComposerClassLoading()`
-   `TYPO3\CMS\Core\Core\Bootstrap::getInstance()`
-   `TYPO3\CMS\Core\Core\Bootstrap->configure()`
-   `TYPO3\CMS\Core\Core\Bootstrap::checkIfEssentialConfigurationExists()`
-   `TYPO3\CMS\Core\Core\Bootstrap->setEarlyInstance()`
-   `TYPO3\CMS\Core\Core\Bootstrap->getEarlyInstance()`
-   `TYPO3\CMS\Core\Core\Bootstrap->getEarlyInstances()`
-   `TYPO3\CMS\Core\Core\Bootstrap::loadConfigurationAndInitialize()`
-   `TYPO3\CMS\Core\Core\Bootstrap->initializePackageManagement()`
-   `TYPO3\CMS\Core\Core\Bootstrap::populateLocalConfiguration()`
-   `TYPO3\CMS\Core\Core\Bootstrap::disableCoreCache()`
-   `TYPO3\CMS\Core\Core\Bootstrap::initializeCachingFramework()`
-   `TYPO3\CMS\Core\Core\Bootstrap->setRequestType()`
-   `TYPO3\CMS\Core\Core\Bootstrap::setFinalCachingFrameworkCacheConfiguration()`

## Impact

This deprecation is only interesting for code that interferes with early core bootstrap.
Those may trigger PHP `E_USER_DEPRECATED` error.

## Affected Installations

Instances using early bootstrap code may be affected by this. Those should strive for
using the general entry method `Bootstrap::init()` instead.

## Migration

See changes on the typo3/testing-framework which formerly used early instance
bootstrap calls for an example on how existing code can be refactored to use
the top level `Bootstrap::init()` instead.