protobuf-3.0.0-beta-1 Java, protoc can not recognize imported types

[George Wang]

Hello, 

I am using the released java package of protobuf-3.0.0-beta-1 (protobuf-java-3.0.0-beta-1.zip), 

I have problem of having protoc to import and recognize a type: 

I have two proto files ("gubmessage.proto","messageheaders.proto") in the source directory (see below)

the "gubmessage.proto" import the"messageheaders.proto"; and also import the "any.proto" under protobuf-3.0.0-beta-1/src/google/protobuf (see below) 

----------------------------------------

syntax = "proto3";

import "messageheaders.proto";

import "google/protobuf/any.proto";

package gubmessage;

option java_generate_equals_and_hash = true;

option java_multiple_files = true;

option java_package = "com.gubnoi.protocol";

option java_outer_classname = "GubMessage";

message GMessage{

  Headers headers = 1;  

  Any body  = 2 ;   

}

-------------------------------------------

 the messageheaders.proto 

------------------------------------------

syntax = "proto3";

package messageheaders;

option java_package = "com.gubnoi.protocol";

option java_outer_classname = "MessageHeaders";

message Headers{

 

        bool censured = 1;

        string header = 2;

repeated string tag = 3 ;

}

-------------------------------------

then I run the command " protoc --proto_path=$FR --proto_path=./google/protobuf --java_out=$TO $FR/gubmessage.proto", 

the environment FR refers to the source directory, and the TO refers to the destination directory

the protoc replied that the imported types "Headers" and "Any" are not defined. in the mean time, there are also two warnings say that the imports are not used (see below) 

any advice?

thanks 

[Feng Xiao]

On Mon, Dec 21, 2015 at 8:46 PM, George Wang <wangjin...@gmail.com> wrote:

Hello, 

I am using the released java package of protobuf-3.0.0-beta-1 (protobuf-java-3.0.0-beta-1.zip), 

I have problem of having protoc to import and recognize a type: 

I have two proto files ("gubmessage.proto","messageheaders.proto") in the source directory (see below)

the "gubmessage.proto" import the"messageheaders.proto"; and also import the "any.proto" under protobuf-3.0.0-beta-1/src/google/protobuf (see below) 

----------------------------------------

syntax = "proto3";

import "messageheaders.proto";

import "google/protobuf/any.proto";

package gubmessage;

option java_generate_equals_and_hash = true;

option java_multiple_files = true;

option java_package = "com.gubnoi.protocol";

option java_outer_classname = "GubMessage";

message GMessage{

  Headers headers = 1;  

  Any body  = 2 ;   

Protobuf imports and name references work much like C++. The full name of the Header message is "messageheaders.Headers". Since this file uses a different package from "messageheaders". It needs to reference the message using its fully qualified name, i.e., you need to declare it as "messageheaders.Headers headers = 1;" here. The same for Any. It should be "google.protobuf.Any body = 2;".

 

}

-------------------------------------------

 the messageheaders.proto 

------------------------------------------

syntax = "proto3";

package messageheaders;

You are giving these two protos the Java package, why not use the same package as well?

 

option java_package = "com.gubnoi.protocol";

option java_outer_classname = "MessageHeaders";

message Headers{

 

        bool censured = 1;

        string header = 2;

repeated string tag = 3 ;

}

-------------------------------------

then I run the command " protoc --proto_path=$FR --proto_path=./google/protobuf --java_out=$TO $FR/gubmessage.proto", 

the environment FR refers to the source directory, and the TO refers to the destination directory

the protoc replied that the imported types "Headers" and "Any" are not defined. in the mean time, there are also two warnings say that the imports are not used (see below) 

any advice?

thanks 

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[George Wang]

Hello, Feng Xiao, 

I followed you advice, and got through with the protoc, thanks. 

yet there emerged new problems. 

I actually configured to export all the protocol buffer generated results into a Java package in the Eclipse (see the screenshot), so that I can applied them  as standard package repeatedly

 I notice some problems:

1: there are three items instead of one; 

according to previous experience, there should be only one file with the java_outer_classname, which is  "GubMessage" in this context; yet you can see that the inner class, (the "GMessage" in this case) is also presented under the package on the same hierarchy with "GubMessage", you can see that two java files "GMessage.java", "GMessageOrBuilder" are now presented in parallel with "GubMessage.java". is this a problem or intended result?

2, you might also notice that there were some errors existed in the java files. I checked one of them (see screenshot),  when I changed to "com.gubnoi.protocol.MessageHeaders.Header", the error disappeared.  it seems to me that protoc had not handled the outer class properly while importing types

Cheers

[George Wang]

Hello, Feng Xiao, 

I followed you advice, and got through with the protoc, thanks. 

yet there emerged new problems. 

I actually configured to export all the protocol buffer generated results into a Java package in the Eclipse (see the screenshot), so that I can applied them  as standard package repeatedly

 I notice some problems:

1: there are three items instead of one; 

according to previous experience, there should be only one file with the java_outer_classname, which is  "GubMessage" in this context; yet you can see that the inner class, (the "GMessage" in this case) is also presented under the package on the same hierarchy with "GubMessage", you can see that two java files "GMessage.java", "GMessageOrBuilder" are now presented in parallel with "GubMessage.java". is this a problem or intended result?

2, you might also notice that there were some errors existed in the java files. I checked one of them (see screenshot),  when I changed to "com.gubnoi.protocol.MessageHeaders.Header", the error disappeared.  it seems to me that protoc had not handled the outer class properly while importing types

Cheers

[George Wang]

Hello, Feng Xiao, 

I followed you advice, and got through with the protoc, thanks. 

yet there emerged new problems as I proceeded. 

I had configured to export all the protocol buffer generated results into a Java package in the Eclipse (see the screenshot)

 I noticed some problems here:

1: there are three items instead of one; 

according to previous experience, there should be only one file with the java_outer_classname, which is  "GubMessage" in this context; yet you can see that the inner class, (the "GMessage" in this case) is also presented under the package on the same hierarchy with "GubMessage", you can see that two java files "GMessage.java", "GMessageOrBuilder" are now presented in parallel with "GubMessage.java". is this a problem or intended result?

2, you might also notice that there were some errors existed in the java files. I checked one of them (see screenshot),  when I changed to "com.gubnoi.protocol.MessageHeaders.Header", the error disappeared.  it seems to me that protoc had not handled the outer class properly while importing types

Cheers

On Tuesday, December 22, 2015 at 1:18:09 PM UTC+8, George Wang wrote:

[Feng Xiao]

On Tue, Dec 22, 2015 at 7:09 PM, George Wang <wangjin...@gmail.com> wrote:

Hello, Feng Xiao, 

I followed you advice, and got through with the protoc, thanks. 

yet there emerged new problems. 

I actually configured to export all the protocol buffer generated results into a Java package in the Eclipse (see the screenshot), so that I can applied them  as standard package repeatedly

 I notice some problems:

1: there are three items instead of one; 

according to previous experience, there should be only one file with the java_outer_classname, which is  "GubMessage" in this context; yet you can see that the inner class, (the "GMessage" in this case) is also presented under the package on the same hierarchy with "GubMessage", you can see that two java files "GMessage.java", "GMessageOrBuilder" are now presented in parallel with "GubMessage.java". is this a problem or intended result?

That's because you have specified the "java_multiple_files = true" option in the .proto file. The error you see may also be related to this. Seems like you have changed these options between invoking protoc on each .proto file. You need to regenerate all your files against the same version of the .proto files.