Errors in java generated HashCode() method

[Tristan Soriano]

Hi,
I am new to protobufers and I have some issues with the generated java code.
I am successfully generating a java class from the following .proto file :

////////////////////////////////////////////////////////////////////////////////////////////////////////
option java_package = "org.myname.hbase.Coprocessor.autogenerated";
option java_outer_classname = "Sum";
option java_generic_services = true;
option java_generate_equals_and_hash = true;
option optimize_for = SPEED;
message SumRequest {
    required string family = 1;
    required string column = 2;
}
 
message SumResponse {
  required int64 sum = 1 [default = 0];
}
 
service SumService {
  rpc getSum(SumRequest)
    returns (SumResponse);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////

However the generated code has error in SumResquest and SumResponse generated class :
The auto generated method : HashCode( ) use an int "memoizedHashCode" as if it was an instance attribute but it is never declared.
In SumRequest :

    @java.lang.Override
    public int hashCode() {
      if (memoizedHashCode != 0) {
        return memoizedHashCode;
      }
      int hash = 41;
      hash = (19 * hash) + getDescriptorForType().hashCode();
      if (hasFamily()) {
        hash = (37 * hash) + FAMILY_FIELD_NUMBER;
        hash = (53 * hash) + getFamily().hashCode();
      }
      if (hasColumn()) {
        hash = (37 * hash) + COLUMN_FIELD_NUMBER;
        hash = (53 * hash) + getColumn().hashCode();
      }
      hash = (29 * hash) + getUnknownFields().hashCode();
      memoizedHashCode = hash;
      return hash;
    }

//////////////////////////////////////////////////////////////////////////////////////////////////////
In SumResponse I have an extra error : The method hashLong(long) is undefined for the type Internal

    @java.lang.Override
    public int hashCode() {
      if (memoizedHashCode != 0) {
        return memoizedHashCode;
      }
      int hash = 41;
      hash = (19 * hash) + getDescriptorForType().hashCode();
      if (hasSum()) {
        hash = (37 * hash) + SUM_FIELD_NUMBER;
        hash = (53 * hash) + com.google.protobuf.Internal.hashLong(
            getSum());
      }
      hash = (29 * hash) + getUnknownFields().hashCode();
      memoizedHashCode = hash;
      return hash;
    }


As we are not supposed to edit the code. Do you have any idea what the solution could be ?
Should I add the missing attribute on my own, at what level and visibility ? How to solve my second issue ?
Is there any risk to add directly "getSum( ) ?

Thx

[Feng Xiao]

The error seems to suggest you are using a different version for protoc and protobuf Java runtime. Could you check whether they are of the same version?

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[Tristan Soriano]

I am using protobuf 2.6.1 with java 8 (Oracle downloaded jdk 1.8.0) on linux ubuntu. I cannot locate any JAVA_HOME call in protobuf folder using 'grep'. How does protoc locate JAVA ? How can I check which version is used by who ?

[Feng Xiao]

On Fri, Apr 17, 2015 at 1:40 AM, Tristan Soriano <mtr.s...@gmail.com> wrote:

I am using protobuf 2.6.1 with java 8 (Oracle downloaded jdk 1.8.0) on linux ubuntu. I cannot locate any JAVA_HOME call in protobuf folder using 'grep'. How does protoc locate JAVA ? How can I check which version is used by who ?

Can you check the protoc version with "protoc --version"? How did you compile your Java code? If you used Maven, what's protobuf version you specified in your pom.xml file? 

[Tristan Soriano]

Hi,

protoc --version
libprotoc 2.6.1

I compile using :
protoc --java_out=./TestProto ./workspace/Coprocessor/src/sum.proto

[Feng Xiao]

So you are using the correct protoc version. Then the problem should be in the protobuf Java runtime. The missing memorizedHashCode is defined in AbstractMessageLite: https://github.com/google/protobuf/blob/v2.6.1/java/src/main/java/com/google/protobuf/AbstractMessageLite.java#L47 which is available from 2.6.1 protobuf runtime.