Commits on Apr 16, 2021

1. Upgrade to Guava 30.1, which warns on Java 7 …

   This change can have large impact from two aspects:
   1. It calls out a _large_ impact on the _few_ Java 7 users.
   2. It may have _small_ impact on the _many_ Android users.
   
   grpc#4671 tracks gRPC's removal of
   Java 7 support. We are quite eager to drop Java 7 support as that would
   allow using new language features like default methods. Guava is also
   dropping Java 7 support and starting in 30.1 it will warn when used on
   Java 7. The purpose of the warning is to help discover users that are
   negatively impacted by dropping Java 7 before it becomes a bigger
   problem.
   
   The Guava logging check was implemented in such a way that there is an
   optional class that uses Java 8 bytecode. While the class is optional at
   runtime, the Android build system notices when dexing and fails if
   Java 8 language featutres are not enabled. We believe this will not be a
   problem for most Android users, but they may need to add to their build:
   
   ```
   android {
       compileOptions {
           sourceCompatibility JavaVersion.VERSION_1_8
           targetCompatibility JavaVersion.VERSION_1_8
       }
   }
   ```
   
   See also https://github.com/google/guava/releases/tag/v30.1

   

   ejona86 committed Apr 16, 2021
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