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.
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With the Capabilities API, your application can detect outages and scheduled
downtime for specific API capabilities. You can use
this API to reduce downtime in your application by detecting when a capability
is unavailable and then bypassing it. .
For example, if you use the Images API to resize images, you can use the
Capabilities API to detect when the Images API is unavailable and skip the
resize:
You can separately query for the availability of Datastore reads and writes. The
following sample shows how to detect the availability of Datastore writes and,
during downtime, provide a message to users:
CapabilityStatusstatus=service.getStatus(Capability.DATASTORE_WRITE).getStatus();if(status==CapabilityStatus.DISABLED){// Datastore is in read-only mode.}
Using the Capabilities API in Java 8
Each Capability is represented as a static constant on the Capability class,
such as
Capability.DATASTORE_WRITE.
Each Capability has a state, which you can retrieve from
CapabilitiesService.getStatus(Capability).
Each state has a status, which is an enumeration reflecting a the availability
of a capability: either ENABLED or DISABLED. See below for the
list of services currently enabled in this API.
Supported capabilities
The API currently supports the following capabilities:
[[["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"]],["Last updated 2025-08-21 UTC."],[[["\u003cp\u003eThe Capabilities API allows applications to detect outages and scheduled downtime for specific API capabilities, helping to minimize application downtime by bypassing unavailable services.\u003c/p\u003e\n"],["\u003cp\u003eThis API supports first-generation runtimes and can be utilized when upgrading to corresponding second-generation runtimes, with specific migration guidance provided for Java 11/17 runtimes.\u003c/p\u003e\n"],["\u003cp\u003eThe API returns an \u003ccode\u003eENABLED\u003c/code\u003e status for all services except "Datastore writes," which returns \u003ccode\u003eDISABLED\u003c/code\u003e when Datastore is in read-only mode.\u003c/p\u003e\n"],["\u003cp\u003eYou can query the availability of Datastore reads and writes separately, enabling you to handle read-only mode scenarios by displaying a custom message to users.\u003c/p\u003e\n"],["\u003cp\u003eThe API can verify the status of services like BLOBSTORE, Datastore, Images, Mail, Memcache, Task Queue, and URL Fetch, allowing for more fault-tolerant applications.\u003c/p\u003e\n"]]],[],null,[]]
