Note: Java 8 has reached end of support on January 31, 2024. Your existing Java 8 applications will continue to run and receive traffic. However, App Engine might block re-deployment of applications that use runtimes after their end of support date. We recommend that you migrate to the latest supported version of Java.

Overview (Google App Engine API for Java 8)

Packages
Package	Description
com.google.appengine.api	Provides facilities for server lifecycle management, threading and namespaces/multitenancy.
com.google.appengine.api.appidentity	Provides a service to sign arbitrary byte arrays using an internally-generated, rotated private key.
com.google.appengine.api.backends	Provides access to long-running, addressable servers.
com.google.appengine.api.blobstore	Provides management and persistent storage of large, immutable byte arrays.
com.google.appengine.api.capabilities	Provides status information about the services available via the Google App Engine APIs.
com.google.appengine.api.datastore	Provides persistent storage, also accessible via JDO or JPA interfaces.
com.google.appengine.api.files	Provides a service for file storage and access.
com.google.appengine.api.images	Provides facilities for the creation and manipulation of images.
com.google.appengine.api.log	Provides access to request logs and application logs.
com.google.appengine.api.mail	Provides a service to send email messages on behalf of administrators or authenticated users, also accessible via a JavaMail interface.
com.google.appengine.api.memcache	Provides fast but unreliable data storage, also accessible via a JCache interface.
com.google.appengine.api.modules	Utility functions for working with modules.
com.google.appengine.api.oauth	Provides a method for clients to access server resources on behalf of a resource owner, as well as a process for end-users to authorize third-party access to their server resources without sharing their credentials.
com.google.appengine.api.quota	Provides measurement of API and CPU usage during requests.
com.google.appengine.api.search	Provides a service for indexing documents and retrieving them using search queries.
com.google.appengine.api.search.checkers
com.google.appengine.api.search.query
com.google.appengine.api.taskqueue	Provides a mechanism to perform work initiated by a user request, outside of that request.
com.google.appengine.api.urlfetch	Provides a service to make HTTP/S requests of other servers on the internet.
com.google.appengine.api.users	Provides facilities to check if a user has authenticated, retrieve their email address, and check if they are an administrator for this application.
com.google.appengine.api.utils	Provides common utility classes.
com.google.apphosting.api	Provides access to the ApiProxy, which dispatches API calls to backend services.

This is the Google App Engine Java API, part of the Google App Engine Java Developer's Guide.