All, re-sending this e-mail. Anyone touching .proto files please make sure you follow the instructions bellow to install the protobuf plugin. I will add that to a wiki page.


---------- Forwarded message ----------
From: Edson Tirelli <>
Date: Wed, Mar 21, 2012 at 12:30 PM
Subject: How to work with Protobuf (.proto) files
To: Rules Dev List <>


   As we started using Protobuf, it is important to know how you make changes to .proto files and how to compile them. Easiest way:

1. Download protobuf compiler from:

2. Install protobuf-dt eclipse plugin as detailed here:

3. Configure the destination directory to generate the java files as detailed in step 2 here:

Set the "Java Output Directory" to: src/main/java

4. VERY IMPORTANT FOR JBPM: jBPM Flow project has a .proto file that extends the data types defined in the .proto file in Drools Core, so you need to configure the protobuf import path as detailed here:

Add the following import paths to the jbpm-flow project:

${your drools-core project in eclipse}/src/main/resources

   After doing that, when you edit and save the .proto files, eclipse will automatically compile and regenerate the java source code for them.