java - SonarQube Eclipse Plugin: Incremental scan scans all files, not just those modified locally -

i using version 3.4 of sonarqube eclipse plugin , when analyze project, scan successful, scans files. know default scan mode 'incremental' plugin, not know why analysis scanning of files , not have modified locally. have sonarqube running on server , can view of current issues in project using web browser.

also, when view sonar-report.json file generated on computer result of scan, of issues have 'isnew' tag set true , update date equals creation date equals time of scan. know incorrect because of issues pre-existing , should have creation date of month ago because see when looking @ issue on server through web browser.

to me seems if eclipse not synchronizing existing issues server because seems not recognize of them. please let me know may wrong. thank you.