protected static void lazyInit ( ) { // noinspection DoubleCheckedLocking if ( instance == null ) { try { STARTUP_LOCK . lockInterruptibly ( ) ; try { if ( instance == null ) { instance = new ProviderUtil ( ) ; } } finally { STARTUP_LOCK . unlock ( ) ; } } catch ( final InterruptedException e ) { LOGGER . fatal ( "Interrupted before Log4j Providers could be loaded." , e ) ; Thread . currentThread ( ) . interrupt ( ) ; } } }
Lazily initializes the ProviderUtil singleton .