[[["わかりやすい","easyToUnderstand","thumb-up"],["問題の解決に役立った","solvedMyProblem","thumb-up"],["その他","otherUp","thumb-up"]],[["わかりにくい","hardToUnderstand","thumb-down"],["情報またはサンプルコードが不正確","incorrectInformationOrSampleCode","thumb-down"],["必要な情報 / サンプルがない","missingTheInformationSamplesINeed","thumb-down"],["翻訳に関する問題","translationIssue","thumb-down"],["その他","otherDown","thumb-down"]],["最終更新日 2025-09-04 UTC。"],[[["\u003cp\u003eApp Engine's first-generation runtimes offered scalable, proprietary services, but some are no longer maintained, posing migration challenges for developers.\u003c/p\u003e\n"],["\u003cp\u003eGoogle Cloud now supports App Engine legacy bundled services on second-generation runtimes like Python 3, Java 11, Go 1.12+, and PHP 7/8, simplifying runtime migration.\u003c/p\u003e\n"],["\u003cp\u003eApps on second-generation runtimes can access legacy bundled services APIs using language-idiomatic libraries, providing a smoother transition.\u003c/p\u003e\n"],["\u003cp\u003eDevelopers migrating from legacy bundled services can opt for equivalent Google Cloud products, third-party solutions, or workarounds for unsupported services.\u003c/p\u003e\n"]]],[],null,["# Overview of legacy bundled services\n\nHistorically, the App Engine standard environment provided several scalable,\nproprietary services for app development. These services were bundled with\n[first-generation runtimes](/appengine/docs/standard/runtimes)\n(also called\nApp Engine *legacy runtimes* ), which include\n[Python 2](/appengine/docs/legacy/standard/python/runtime),\n[Java 8](/appengine/docs/legacy/standard/java/runtime),\n[Go 1.11](/appengine/docs/legacy/standard/go111/runtime), and\n[PHP 5.5](/appengine/docs/legacy/standard/php/runtime). Because several\nof the legacy runtimes are no longer maintained by their respective\nopen-source communities, as an App Engine developer, you may face hard choices\non whether to invest time and effort in migrating to a newer runtime or else\nincur growing costs to retain your app on a legacy runtime.\n\nRecognizing this challenge, Google Cloud is committed to providing you with a\nmore incremental migration path to newer runtimes. To reduce runtime migration\ncomplexity, Google Cloud now supports a set of App Engine legacy bundled services and\ntheir associated APIs on second-generation runtimes, which include\n[Python 3](/appengine/docs/standard/python3/runtime),\n[Java 11](/appengine/docs/standard/java-gen2/runtime),\n[Go 1.12+](/appengine/docs/standard/go/runtime), and\n[PHP 7/8](/appengine/docs/standard/php-gen2/runtime). Your app\ncan call legacy bundled services APIs for second-generation runtimes through\nlanguage-idiomatic libraries.\n**Figure 1.** How apps access the App Engine legacy bundled services\n\nIn runtime migration scenarios, you often also have the option to use\nGoogle Cloud products that offer similar functionality as the\nlegacy bundled services. For the legacy bundled services that are not available as\nseparate products in Google Cloud, such as image processing, search, and\nmessaging, you can use third-party providers or other workarounds as suggested\nin the [Runtimes guide](/appengine/docs/standard/runtimes).\n\n\u003cbr /\u003e\n\nTo learn more about these options for migrating your app, see\n[Migrate off of legacy bundled services](/appengine/migration-center/standard/services/migrating-services).\nIf you need to access the App Engine legacy bundled services when migrating to second-generation runtimes,\nsee [Access legacy bundled services for Java 11/17](/appengine/docs/standard/java-gen2/services/access).\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e"]]
