Which part in pom.xml the javadoc plugin should be configured?
It can be done in the plugins section of the pom or in the plugins section of the report section in the pom. Generally, you should configure it in the reporting section. Configuration there applies to both the site, and when run on the command line, and adding the plugin there adds the report to the generated site. Configuration in the build section is only used during the normal lifecycle or the command line invocation (e.g. javadoc:javadoc). Configuration should go there if you do not want the report on the site, or the configuration differs from what is on the site (e.g., some plugins have a fail build option).
