'InvalidProtocolBufferException when parsing protobuf - invalid tag (zero)

I have a protobuf message which cribs while being parsed.

I ran the client and server on the same machine and serialized the byte stream.

I compare this with the received byte array using Arrays.equal in java. It says that they are equal.

My protobuf has just a single fixed32 field storing an IP address.

I used both google protobuf 2.4.1 and 2.5.0 versions with no success. Anything I am missing here?

Stacktrace:

com.google.protobuf.InvalidProtocolBufferException: Protocol message contained an invalid tag (zero).
at com.google.protobuf.InvalidProtocolBufferException.invalidTag(InvalidProtocolBufferException.java:89)
at com.google.protobuf.CodedInputStream.readTag(CodedInputStream.java:108)

... ...

Protobuf Code:

message IpMessage {
    required fixed32 ip = 1;
}

Compilation:

protoc --java_out=. ip-message.proto

To parse the message, I use:

IpMessage.parseFrom(receivedPkt); //receivedPkt is byte[]
javaprotocol-buffers


Solution 1:[1]

This error appears if your code parses wrong protobuf message at current binary file location. In your case above, current receivedPkt isn't a IpMessage.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Linh Dao

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