src/java.base/share/classes/java/net/URL.java

*** 1391,1405 ****
              if (handler == null) {
                  handler = lookupViaProperty(protocol);
              }
          }
  
-         synchronized (streamHandlerLock) {
              if (handler == null) {
                  // Try the built-in protocol handler
                  handler = defaultFactory.createURLStreamHandler(protocol);
!             } else {
                  URLStreamHandler handler2 = null;
  
                  // Check again with hashtable just in case another
                  // thread created a handler since we last checked
                  handler2 = handlers.get(protocol);
--- 1391,1406 ----
              if (handler == null) {
                  handler = lookupViaProperty(protocol);
              }
          }
  
          if (handler == null) {
              // Try the built-in protocol handler
              handler = defaultFactory.createURLStreamHandler(protocol);
!         }
! 
!         synchronized (streamHandlerLock) {
              URLStreamHandler handler2 = null;
  
              // Check again with hashtable just in case another
              // thread created a handler since we last checked
              handler2 = handlers.get(protocol);
*** 1424,1434 ****
  
              // Insert this handler into the hashtable
              if (handler != null) {
                  handlers.put(protocol, handler);
              }
-         }
  
          return handler;
      }
  
      /**
--- 1425,1434 ----