question: private void loadManifest ( ) { if ( _isManifestRead ) return ; synchronized ( this ) { if ( _isManifestRead ) return ; try { _manifest = _jarPath . getManifest ( ) ; if ( _manifest == null ) return ; Attributes attr = _manifest . getMainAttributes ( ) ; if ( attr != null ) addManifestPackage ( "" , attr ) ; Map < String , Attributes > entries = _manifest . getEntries ( ) ; for ( Map . Entry < String , Attributes > entry : entries . entrySet ( ) ) { String pkg = entry . getKey ( ) ; attr = entry . getValue ( ) ; if ( attr == null ) continue ; addManifestPackage ( pkg , attr ) ; } } catch ( IOException e ) { log . log ( Level . WARNING , e . toString ( ) , e ) ; } finally { _isManifestRead = true ; } } }
target:  Reads the jar's manifest.