Failed to compile the protobuf java example

[David Portabella]

Hello,

I don't manage to compile the java example.
I do as follows (I've tried with OSX and Cygwin, with the exact same
results):

Download protobuf-2.3.0.zip from: http://code.google.com/p/protobuf/
unzip protobuf-2.3.0.zip
cd protobuf-2.3.0
./configure
# ./configure --disable-shared # in case of Cygwin
make
make check
make install

# note: compilation fails if the directory name contains blank spaces.

export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
cd examples
make cpp
./add_person_cpp test.bin # this works.

make java
-- javac AddPerson.java ListPeople.java com/example/tutorial/
AddressBookProtos.java
-- com/example/tutorial/AddressBookProtos.java:12: package
com.google.protobuf does not exist

cp -r ../java/src/main/java/com/* com/ # I shouldn't need to do
this. i guess that the makefile should include the classpath.
make java
-- javac AddPerson.java ListPeople.java com/example/tutorial/
AddressBookProtos.java
-- ./com/google/protobuf/Descriptors.java:33: package
com.google.protobuf.DescriptorProtos does not exist

find .. -iname "*DescriptorProtos*"
-- nothing, this file does not exist.

Where should I get this class from
com.google.protobuf.DescriptorProtos?


Many thanks,
David

[Kenton Varda]

Please read the readmes.  Running "make install" in the root directory installs the C++ libraries only.  You need to install the Java and Python versions separately by following the instructions in the corresponding directories.

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[Noah Easterly]

I installed the java libraries using `mvn install` in protobuf-2.3.0/
java, but still get the same errors when trying to do `make java` in
protobuf-2.3.0/examples. I've never used Maven before - is there
something I need to set up so javac knows where to look to find the
jarfile maven created (~/.m2/repository/com/google/protobuf/protobuf-
java/2.3.0/protobuf-java-2.3.0.jar)?

I've tried

% export CLASSPATH=~/.m2/repository
% make java

and

% export CLASSPATH=~/.m2/repository/com/google/protobuf/protobuf-java/
2.3.0/
% make java

But both seem to give the same error.

What should I be doing?

On Aug 31, 7:51 pm, Kenton Varda <ken...@google.com> wrote:
> Please read the readmes.  Running "make install" in the root directory
> installs the C++ libraries only.  You need to install the Java and Python
> versions separately by following the instructions in the corresponding
> directories.
>
> On Tue, Aug 31, 2010 at 3:25 AM, David Portabella <
>

> > protobuf+u...@googlegroups.com<protobuf%2Bunsu...@googlegroups.com>
> > .

[Kenton Varda]

You need to list the .jar file itself in the CLASSPATH.  It's not enough to just list the directory that contains it.

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[Vivek kumar]

ac3@ac3-Veriton-Series:~$ javac AddPerson.java -cp protobuf-java-3.0.0.jar

its shows error:

AddPerson.java:3: error: package com.example.tutorial.AddressBookProtos does not exist

import com.example.tutorial.AddressBookProtos.AddressBook;

                                             ^

AddPerson.java:4: error: package com.example.tutorial.AddressBookProtos does not exist

import com.example.tutorial.AddressBookProtos.Person;

                                             ^

AddPerson.java:15: error: cannot find symbol

  static Person PromptForAddress(BufferedReader stdin,

         ^

  symbol:   class Person

  location: class AddPerson

AddPerson.java:17: error: package Person does not exist

    Person.Builder person = Person.newBuilder();

          ^

AddPerson.java:17: error: cannot find symbol

    Person.Builder person = Person.newBuilder();

                            ^

  symbol:   variable Person

  location: class AddPerson

AddPerson.java:38: error: package Person.PhoneNumber does not exist

      Person.PhoneNumber.Builder phoneNumber =

                        ^

AddPerson.java:39: error: package Person does not exist

        Person.PhoneNumber.newBuilder().setNumber(number);

              ^

AddPerson.java:44: error: package Person does not exist

        phoneNumber.setType(Person.PhoneType.MOBILE);

                                  ^

AddPerson.java:46: error: package Person does not exist

        phoneNumber.setType(Person.PhoneType.HOME);

                                  ^

AddPerson.java:48: error: package Person does not exist

        phoneNumber.setType(Person.PhoneType.WORK);

                                  ^

AddPerson.java:68: error: package AddressBook does not exist

    AddressBook.Builder addressBook = AddressBook.newBuilder();

               ^

AddPerson.java:68: error: cannot find symbol

    AddressBook.Builder addressBook = AddressBook.newBuilder();

                                      ^

  symbol:   variable AddressBook

  location: class AddPerson

12 errors

 please help im new to protocol buffer

[Adam Cozzette]

That javac invocation is failing because it is not being given the generated code from the protobuf compiler (protoc). I would recommend building the Java examples by running "make java"; just make sure that protoc is on your PATH and that the protobuf JAR is in your CLASSPATH.

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[Vivek kumar]

thanks a lot..

i have  missed : make java & and i have not set classpath and path as well..
now successfully compiled
thanks

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