question: public OpenDJUpgrader ( EmbeddedOpenDJBackupManager backupManager , String installRoot , ServletContext servletCtx ) { this . backupManager = backupManager ; this . installRoot = installRoot ; this . servletCtx = servletCtx ; this . upgradeMarker = new File ( installRoot + "/.upgrade_marker" ) ; this . newVersion = readNewVersion ( ) ; OpenDJVersion currentVersion = readCurrentVersion ( ) ; if ( upgradeMarker . exists ( ) && newVersion . equals ( currentVersion ) ) { this . currentVersion = readVersionFromFile ( upgradeMarker ) ; } else { this . currentVersion = currentVersion ; } }
target:  Creates a new OpenDJ upgrader.