String encoding = (String) project.getProperties().get("project.build.sourceEncoding");
        if (StringUtils.isNotEmpty(encoding)) {
            builder.taskPropertyAssignment(null, "JavaCompile", "options.encoding", encoding);
            builder.taskPropertyAssignment(null, "Javadoc", "options.encoding", encoding);
        }
    }

    private Plugin plugin(String artifactId, MavenProject project) {