````quote
I have the following field
```
public List<List<String>> data;
```
That I need to serialise using protobuf (for infinispan-client).
I am trying to annotate the getter this way
```
@ProtoField(number = 6)
public List<List<String>> getData() {
return data;
}
```
But I got:
```
org.infinispan.protostream.annotations.ProtoSchemaBuilderException: The
type java.util.List of field 'data' of xyz.property.data.model.GrowthStats
should not be abstract.
```
Hence I created another class called Data:
```
@Setter
@EqualsAndHashCode
public class Data {
List<String> stats;
@ProtoField(number = 1, collectionImplementation = ArrayList.class)
public List<String> getStats() {
return stats;
}
}
```
and modified the main class this way:
```
public List<Data> data;
@ProtoField(number = 6, collectionImplementation = ArrayList.class)
public List<Data> getData() {
return data;
}
```
And I created this:
```
@AutoProtoSchemaBuilder(includeClasses = {GrowthStats.class, Data.class},
schemaPackageName = "stats.data.xyz.property")
public interface GrowthContextInitializer extends
SerializationContextInitializer {
}
```
````
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