How do I get Eclipse to resolve classes generated with Maven 2?

Question

I\'m using Google Protocol Buffers to generate some Java classes for my project. Using Maven 2 and its \"antrun\" plugin, these classes are freshly generated before compile,

Answer 1

To generate Java source files from .proto files use Protocol Buffers Plugin which works out-of-the-box in eclipse Oxygen.

Basic usage (see here for detailed description):

• make sure that native protoc compiler is installed on your system

• update your pom.xml file:

  • make sure you use at least Java 6 (Java 7+ is recommended)

  • add plugin invocation

  • add the corresponding dependency for com.google.protobuf:protobuf-java

• put your .proto files inside project's src/main/proto directory

• update the project (via Maven -> Update project...)

Example pom.xml:

  ...
  
    
      
      
        org.apache.maven.plugins
        maven-compiler-plugin
        3.7.0
        
          1.6
          1.6
        
      
      
      
        org.xolstice.maven.plugins
        protobuf-maven-plugin
        0.5.1
        
          /usr/local/bin/protoc
        
        
          
            
              compile
              test-compile
            
          
        
      
      ...
    
  
  
    
      com.google.protobuf
      protobuf-java
      3.5.1
    
    ...
  
  ...

Some additional notes:

• if protoc executable is in the PATH the protocExecutable configuration entry can be omitted

• test-only protobuf message definitions can be put into project's src/test/proto directory

• I recommend installing Protocol Buffer Descriptor Editor (marketplace link)

Good luck!