Java 8 has reached end of support
and will be
deprecated
on January 31, 2026. After deprecation, you won't be able to deploy Java 8
applications, even if your organization previously used an organization policy to
re-enable deployments of legacy runtimes. Your existing Java
8 applications will continue to run and receive traffic after their
deprecation date. We recommend that
you
migrate to the latest supported version of Java.
APIs and Reference
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Cloud Client Libraries for Java
Request Headers and Responses
The APIs in this section are still supported, but are no longer recommended.
Instead, use the Cloud client libraries.
Apps that use these superseded APIs will need to migrate to the Cloud client
libraries and other services before upgrading to newer Google Cloud runtimes
or other environments that support Java.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],[],[[["\u003cp\u003eCloud Client Libraries offer idiomatic access to Google Cloud services like Cloud Storage and Firestore in Datastore mode.\u003c/p\u003e\n"],["\u003cp\u003eConfiguration files such as \u003ccode\u003eappengine-web.xml\u003c/code\u003e, \u003ccode\u003edispatch.yaml\u003c/code\u003e, \u003ccode\u003eindex.yaml\u003c/code\u003e, \u003ccode\u003equeue.yaml\u003c/code\u003e, and \u003ccode\u003eweb.xml\u003c/code\u003e are used to configure various aspects of App Engine deployments and applications.\u003c/p\u003e\n"],["\u003cp\u003eApp Engine supports specific HTTP headers and defines request and response limits, detailed in the Request Headers and Responses section.\u003c/p\u003e\n"],["\u003cp\u003eThe App Engine Admin API provides REST and RPC interfaces for managing App Engine applications, and can be used by any programming language.\u003c/p\u003e\n"],["\u003cp\u003eSuperseded App Engine APIs, like those in the Java 8 runtime, are still supported but migration to Cloud Client Libraries is recommended for newer environments.\u003c/p\u003e\n"]]],[],null,["# APIs and Reference\n\nCloud Client Libraries for Java\n-------------------------------\n\n- [### APIs and Java libraries\n Use the Cloud client libraries for idiomatic access to\n Google Cloud services such as Cloud Storage and\nFirestore in Datastore mode (Datastore).](/java/docs/reference) \n\nConfiguration Files\n-------------------\n\n- [### appengine-web.xml\n Details about the configuration file that is used to\n configure App Engine deployed versions.](/appengine/docs/legacy/standard/java/config/appref)\n- [### dispatch.yaml\n Details about the configuration file that is used to\n route incoming requests to a specific service based on the path or hostname\n in the URL.](/appengine/docs/legacy/standard/java/reference/dispatch-yaml)\n- [### index.yaml\n Details about the configuration file used to define the\n Datastore indexes of the data in your app.](/appengine/docs/legacy/standard/java/configuring-datastore-indexes-with-index-yaml)\n- [### queue.yaml\n Details about the configuration file used to define the\n App Engine task queues in your app.](/appengine/docs/legacy/standard/java/config/queueref-yaml)\n- [### web.xml\n Details about the deployment descriptor that Java web\napplications use map URLs map to servlets.](/appengine/docs/legacy/standard/java/config/webxml) \n\nRequest Headers and Responses\n-----------------------------\n\n- [### Request Headers and Responses\n Details about what HTTP headers are supported as well as\nthe request and response limits in App Engine.](/appengine/docs/legacy/standard/java/reference/request-response-headers) \n\nAdmin API\n---------\n\n- [### App Engine Admin API\n Use the REST and RPC APIs with any programming language to\nmanage your App Engine applications.](/appengine/docs/admin-api/apis) \n\nApp Engine Tools Reference\n--------------------------\n\n- [### App Engine Tools API\n IDEs and other development utilities can use these APIs\nto perform testing and deployment of App Engine applications.](/appengine/docs/legacy/standard/java/tools/javadoc) \n\nSuperseded APIs\n---------------\n\nThe APIs in this section are still supported, but are no longer recommended.\nInstead, use the Cloud client libraries.\n\nApps that use these superseded APIs will need to migrate to the Cloud client\nlibraries and other services before upgrading to newer Google Cloud runtimes\nor other environments that support Java.\n\n- [### App Engine Javadoc\n App Engine APIs that are built into the Java 8 runtime.](/appengine/docs/legacy/standard/java/javadoc)"]]
