See JENKINS-65988. Jenkins core is using Guava 11.0.1, which was released on January 9, 2012. Jenkins core would like to upgrade to Guava 30.1.1, which was released on March 19, 2021. Plugins must be prepared to be compatible with both Guava 11.0.1 and Guava 30.1.1 in advance of this core transition.

{{Objects#firstNonNull}

In particular, this plugin has been identified as using the com.google.common.base.Objects#firstNonNull method, which existed in Guava 11.0.1 but was removed in later versions.

To facilitate the Jenkins core transition, this plugin must be prepared and released such that it works with both Guava 11.0.1 and latest. The general recommendation is to migrate away from Objects#firstNonNull and rewrite the code to use the native functionality provided by the Java Platform.

For an example of how to do this, see:

• jenkinsci/gearman-plugin#14

Futures#addCallback(addCallback(ListenableFuture<V> future, FutureCallback<? super V> callback)

In particular, this plugin has been identified as using the Futures#addCallback(addCallback(ListenableFuture<V> future, FutureCallback<? super V> callback) method, which existed in Guava 11.0.1 but was removed in later versions.

To facilitate the Jenkins core transition, this plugin must be prepared and released such that it works with both Guava 11.0.1 and latest. The general recommendation is to rewrite this code to rewrite this code to use Futures#addCallback(ListenableFuture<V> future, FutureCallback<? super V> callback, Executor executor), which is present in both Guava versions.