jar
                        module
                        Developer
                            Jahia 7.3
                            Jahia 8
                            Legacy
                            
                Embeded JAR causes a conflict
Question
Customer embedded a jar in jahia module and run into a problem.
Cause
The embedded jar file is also a module and so two versions of the jar file are available.
Solution
Use in pom.xml the <scope>provided</scope>
In that case, the jar will not embed and the installed module jar is used.