Failing ParseFrom messages in java from C++

[limas...@gmail.com]

Hello folks, I have a question/problem.

I'm sending messages from C++ to Java (Play framework) using RabbitMq. So, in C++ side I used SerializeToString function (also tried SerializeToArray with char* ). ParseFrom doesn't work in Java using String or byte [].

Detail: in my message, I send base64 images, over 500k characters as String. 

The error is: CodedInputStream encountered an embedded string or message which claimed to have negative size.

Messages without base64 strings and other attributes, ParseFrom works ok.

Here the complete error:

play.api.http.HttpErrorHandlerExceptions$$anon$1: Execution exception[[InvalidProtocolBufferException: CodedInputStream encountered an embedded string or message which claimed to have negative size.]]
    at play.api.http.HttpErrorHandlerExceptions$.throwableToUsefulException(HttpErrorHandler.scala:323)
    at play.api.http.DefaultHttpErrorHandler.onServerError(HttpErrorHandler.scala:243)
    at play.core.server.AkkaHttpServer$$anonfun$1.applyOrElse(AkkaHttpServer.scala:382)
    at play.core.server.AkkaHttpServer$$anonfun$1.applyOrElse(AkkaHttpServer.scala:380)
    at scala.concurrent.Future.$anonfun$recoverWith$1(Future.scala:417)
    at scala.concurrent.impl.Promise.$anonfun$transformWith$1(Promise.scala:41)
    at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:64)
    at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55)
    at akka.dispatch.BatchingExecutor$BlockableBatch.$anonfun$run$1(BatchingExecutor.scala:91)
    at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
Caused by: com.google.protobuf.InvalidProtocolBufferException: CodedInputStream encountered an embedded string or message which claimed to have negative size.
    at com.google.protobuf.InvalidProtocolBufferException.negativeSize(InvalidProtocolBufferException.java:92)
    at com.google.protobuf.CodedInputStream$ArrayDecoder.pushLimit(CodedInputStream.java:1179)
    at com.google.protobuf.CodedInputStream$ArrayDecoder.readMessage(CodedInputStream.java:881)
    at model.RequestOrResponse$Response.dynamicMethod(RequestOrResponse.java:1542)
    at com.google.protobuf.GeneratedMessageLite.parsePartialFrom(GeneratedMessageLite.java:1597)
    at com.google.protobuf.GeneratedMessageLite.parsePartialFrom(GeneratedMessageLite.java:1630)
    at com.google.protobuf.GeneratedMessageLite.parseFrom(GeneratedMessageLite.java:1746)
    at model.RequestOrResponse$Response.parseFrom(RequestOrResponse.java:1232)
    at controllers.SubjectController.get(SubjectController.java:189)
    at router.Routes$$anonfun$routes$1.$anonfun$applyOrElse$14(Routes.scala:187)




[limas...@gmail.com]

I asked at StackOverflow too and I fixed it:

https://stackoverflow.com/questions/55954550/failing-parsefrom-messages-in-java-from-c/55958665