I am using **protobuf** now for some weeks, but I still keep getting
exceptions when parsing protobuf messages in **Java**.
I use **C++** to create my protobuf messages and send them with
**boost sockets** to a server socket where the Java client ist
listening. The C++ code for transmitting the message is this:
boost::asio::streambuf b;
std::ostream os(&b);
ZeroCopyOutputStream *raw_output = new OstreamOutputStream(&os);
CodedOutputStream *coded_output = new CodedOutputStream(raw_output);
coded_output->WriteVarint32(agentMessage.ByteSize());
agentMessage.SerializeToCodedStream(coded_output);
delete coded_output;
delete raw_output;
boost::system::error_code ignored_error;
boost::asio::async_write(socket, b.data(), boost::bind(
&MessageService::handle_write, this,
boost::asio::placeholders::error));
As you can see I write with `WriteVarint32` the length of the message,
thus the Java side should know by using `parseDelimitedFrom` how far
it should read:
AgentMessage agentMessage = AgentMessageProtos.AgentMessage
.parseDelimitedFrom(socket.getInputStream());
But it's no help, I keep getting these kind of Exceptions:
Protocol message contained an invalid tag (zero).
Message missing required fields: ...
It is **important** to know, that these exceptions are not thrown on
every message. This is only a fraction of the messages I receive the
most work out just fine - still I would like to fix this since I do
not want to omit the messages.
I would be really gratful if someone could help me out or spent his
ideas.
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