Support for messages without fields (empty messages)

[technocoreai]

ProtoToJavaBeanCompiler ignores messages without any fields for some reason. The comment looks like it's related to RPC services somehow, but it's possible to have an empty message in a proto schema without services (for future extensibility) and protoc compiles such schemas just fine.

[posix4e]

We have this need. For now my workaround is plopping in an optional boolean

[kshchepanovskyi]

Let's fix it :)

[kshchepanovskyi]

This problem also affects RuntimeSchema:

16:28:54.118 [pool-19-thread-1] ERROR  c.p.l.t.i.c.utils.GameEngineHelper - Can't emit StartGameActions
java.lang.RuntimeException: Not able to map any fields from class com.playtech.live.tableservice.api.event.StartGameActions.  All fields are either transient/static.
    at com.dyuproject.protostuff.runtime.RuntimeSchema.createFrom(RuntimeSchema.java:245) ~[protostuff-runtime-1.0.7.jar:1.0.7]
    at com.dyuproject.protostuff.runtime.RuntimeSchema.createFrom(RuntimeSchema.java:147) ~[protostuff-runtime-1.0.7.jar:1.0.7]
    at com.playtech.openapi.core.frontend.messages.resolver.SchemaCache.createSchema(SchemaCache.java:46) ~[com.playtech.openapi.core-14.10.0.11.jar:14.10.0.1410061255-SNAPSHOT]
    at com.playtech.openapi.core.frontend.messages.resolver.SchemaCache.getSchema(SchemaCache.java:38) ~[com.playtech.openapi.core-14.10.0.11.jar:14.10.0.1410061255-SNAPSHOT]
    at com.playtech.live.tableservice.transport.util.LogRecordSerializer.serialize(LogRecordSerializer.java:26) ~[classes/:na]

[kshchepanovskyi]

Merged