Found this thread with same issue 

https://osgeo-org.atlassian.net/browse/GEOT-5910

I will try downgrade to protobuf 3.4

On Tuesday, January 4, 2022 at 1:23:35 PM UTC-5 Geoffrey Schulman wrote:

> Gradle builds just fine, but eclipse complaining about all casts from 
> GeneratedMessageLite.Builder()
>
>     public static Builder newBuilder() {
>       return (Builder) DEFAULT_INSTANCE.createBuilder();
>     }
>
> Cannot cast from 
> GeneratedMessageLite.Builder<GeneratedMessageLite<GeneratedMessageLite<MessageType,GeneratedMessageLite.Builder<MessageType,BuilderType>>,GeneratedMessageLite.Builder<GeneratedMessageLite<MessageType,BuilderType>,BuilderType>>,GeneratedMessageLite.Builder<GeneratedMessageLite<GeneratedMessageLite<MessageType,BuilderType>,BuilderType>,BuilderType>>
>  
> to PeerSeedProtos.PeerSeeds.Builder
>
> On Monday, January 3, 2022 at 8:16:25 PM UTC-5 Andreas Schildbach wrote:
>
>> If you use Gradle for building, it should use the correct versions 
>> automatically. 
>>
>> On current master, we use Protobuf 3.18.0. 
>>
>>
>> On 04/01/2022 01.18, Geoffrey Schulman wrote: 
>> > Curious which version of protobuf I should be building with as 3.19.1 
>> > java source has come compilation errors... 
>> > 
>> > Thank you 
>> > 
>> > Geoff Schulman 
>> > 
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>>
>

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