When testing the Helidon Server with the ExpressJS front-end, the following exception is seen in the helidon server log:
2023.03.31 13:35:58 SEVERE coherence Thread[Logger@9226098 23.03,3,main]: (thread=nioEventLoopGroup-4-1, member=1, up=132.787): java.lang.IllegalStateException: Cannot find a serializer configuration for name 'json'
2023.03.31 13:35:58 SEVERE coherence Thread[Logger@9226098 23.03,3,main]: (thread=nioEventLoopGroup-4-1, member=1, up=132.788): java.lang.IllegalStateException: Cannot find a serializer configuration for name 'json'
at com.tangosol.io.NamedSerializerFactory.lambda$static$0(NamedSerializerFactory.java:53)
at com.oracle.coherence.grpc.proxy.BaseGrpcServiceImpl.getSerializer(BaseGrpcServiceImpl.java:126)
at com.oracle.coherence.grpc.proxy.NamedCacheServiceImpl.createRequestHolder(NamedCacheServiceImpl.java:1446)
at com.oracle.coherence.grpc.proxy.MapListenerProxy.onNext(MapListenerProxy.java:97)
at com.oracle.coherence.grpc.proxy.MapListenerProxy.onNext(MapListenerProxy.java:64)
at io.grpc.stub.ServerCalls$StreamingServerCallHandler$StreamingServerCallListener.onMessage(ServerCalls.java:262)
at io.grpc.ForwardingServerCallListener.onMessage(ForwardingServerCallListener.java:33)
at com.oracle.coherence.grpc.proxy.GrpcMetricsInterceptor$MessageTimingCallListener.onMessage(GrpcMetricsInterceptor.java:188)
at io.grpc.ForwardingServerCallListener.onMessage(ForwardingServerCallListener.java:33)