When I remove 
implementation("com.google.protobuf:protobuf-java:3.23.0") {
        exclude(group: 'com.google.guava', module: 'guava')
        exclude(group: 'org.checkerframework', module: 
'checker-compat-qual')
        exclude(group: 'javax.annotation', module: 'jsr250-api')
        exclude(group: 'io.opencensus', module: 'opencensus-api')
        exclude(group: 'com.google.errorprone', module: 
'error_prone_annotations')
        exclude(group: 'com.google.protobuf', module: 'protobuf-javalite')
        exclude(group: 'io.grpc', module: 'grpc-context')
    }
}
Timestamp does not get recognized, but CheckReturnValue problem is gone.  
On the other side when I add it I get CheckReturnValue error. Do you have 
any idea if the problem is with the protobuf-java or the guava dependency?
On Friday, June 16, 2023 at 11:55:09 AM UTC-5 Deanna Garcia wrote:

> I think you're right that this is likely a problem with guava. Can you try 
> posting a bug in their repo?
>
> On Thursday, June 15, 2023 at 6:55:37 PM UTC-7 Kevin Jimenez wrote:
>
>> I am trying to install grpc for Android with access to Timestamp. The 
>> generated code generates ok but the project throws this error. I did some 
>> research and it looks like it has to do with guava. Attached is my app 
>> build.grade:
>>
>> *Error* 
>>
>> > Task :app:compileDevDebugJavaWithJavac
>> error: cannot access CheckReturnValue
>>   class file for javax.annotation.CheckReturnValue not found
>> cannot access CheckReturnValue
>>
>> Note: Some input files use or override a deprecated API.
>> Note: Recompile with -Xlint:deprecation for details.
>> 1 error
>>
>> Build Gradle Snippet
>> `` 
>>
>>     // You need to build grpc-java to obtain these libraries below.
>>     implementation 'io.grpc:grpc-okhttp:1.55.1' // CURRENT_GRPC_VERSION
>>     implementation 'io.grpc:grpc-protobuf-lite:1.55.1' // 
>> CURRENT_GRPC_VERSION
>>     implementation 'io.grpc:grpc-stub:1.55.1' // CURRENT_GRPC_VERSION
>>     implementation 'org.apache.tomcat:annotations-api:6.0.53'
>>     implementation 'com.google.protobuf:protobuf-javalite:3.23.2'
>>     implementation("com.google.protobuf:protobuf-java:3.23.0") {
>>         exclude(group: 'com.google.guava', module: 'guava')
>>         exclude(group: 'org.checkerframework', module: 
>> 'checker-compat-qual')
>>         exclude(group: 'javax.annotation', module: 'jsr250-api')
>>         exclude(group: 'io.opencensus', module: 'opencensus-api')
>>         exclude(group: 'com.google.errorprone', module: 
>> 'error_prone_annotations')
>>         exclude(group: 'com.google.protobuf', module: 'protobuf-javalite')
>>         exclude(group: 'io.grpc', module: 'grpc-context')
>>     }
>> //    implementation 
>> 'com.google.errorprone:error_prone_annotations:2.18.0'
>> //    implementation("com.google.guava:guava:32.0.1-android")
>>     //protobuf 'com.google.protobuf:protobuf-java:3.23.0'
>> }
>>
>> protobuf {
>>     protoc { artifact = 'com.google.protobuf:protoc:3.23.2' }
>>     plugins {
>>         grpc {
>>             artifact = 'io.grpc:protoc-gen-grpc-java:1.55.1' // 
>> CURRENT_GRPC_VERSION
>>         }
>>     }
>>     generateProtoTasks {
>>         all().each { task ->
>>             task.builtins {
>>                 java { option 'lite' }
>>             }
>>             task.plugins {
>>                 grpc { // Options added to --grpc_out
>>                     option 'lite'
>>                 }
>>             }
>>         }
>>     }
>> }
>> ```
>>
>> Thanks in advance! Lmk if you want any more info
>>
>>

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