I am using Sonar 4.5.1 and sonar-pdfreport-plugin-1.4 to run the build. PDF report is not getting generated an is showing below message : Internal error: Can't retrieve project info. Parent project node is empty. Authentication?. I saw a bug posted for this (https://jira.sonarsource.com/browse/SONARPLUGINS-3854) but would like to know what is the workaround available for this issue. User Authentication is already set for this in General Settings->Pdf report but doesn't work either.
This issue has been fixed in commit a49b8f61afbf47b5f7976d0a759cb0efcd6c5bce.
For now you cannot download jar with this fix, but you can download sources and build custom version:
git clone https://github.com/SonarQubeCommunity/sonar-pdf-report.git or download zip)mvn clean installsonar/data/extensions/plugins