Jacoco Maven multi module project coverage

Question

Seems like there are couple of questions, which are quite old and things changed from Java 8 support of Jacoco.

My Project contains following structure

Answer 1

Follow below-mentioned instructions

1. Create a new sub-project. This will be used as , report aggregator. parent pom will be like:

        A
        B
        C
        ReportAggregator
    

2. In aggregator branch pom- add other subprojects dependencies.

            xyz
            A
            ${project.version}
        

3. In aggregator branch pom- configure jacoco plugin

                org.jacoco
                jacoco-maven-plugin
                0.8.6
                
                    
                        
                            prepare-agent
                        
                    
                    
                        report-aggregate
                        verify
                        
                            report-aggregate
                        
                        
                            
                                **/jacoco.exec
                            
                            ${project.reporting.outputDirectory}/jacoco-aggregate
                        
                    
                
            

4. In aggregator branch pom- configure surefire plugin as

                org.apache.maven.plugins
                maven-surefire-plugin
                3.0.0-M5
                
                    
                        **/jacoco.exec
                    
                
            

5. (optional step) If anybody face warning/error like: Classes in bundle '*' do no match with execution data. For report generation, the same class files must be used as at runtime.**

Then add below mentioned lines in aggregator branch pom

 
                org.jacoco
                jacoco-maven-plugin
                0.8.6
                
                    
                        instrument-ut
                        
                            instrument
                        
                    
                    
                        restore-ut
                        
                            restore-instrumented-classes
                        
                    
                    
                        
                            prepare-agent
                        
                    
                    
                        report-aggregate
                        verify
                        
                            report-aggregate
                        
                        
                            
                                **/jacoco.exec
                            
                            ${project.reporting.outputDirectory}/jacoco-aggregate
                        
                    
                
            

6. run mvn clean install