src/java.base/share/classes/javax/security/auth/login/LoginContext.java

rev 52979 : 8215281: Use String.isEmpty() when applicable in java.base
Reviewed-by: TBD

*** 298,308 ****
              this.callbackHandler = java.security.AccessController.doPrivileged(
                  new java.security.PrivilegedExceptionAction<CallbackHandler>() {
                  public CallbackHandler run() throws Exception {
                      String defaultHandler = java.security.Security.getProperty
                          (DEFAULT_HANDLER);
!                     if (defaultHandler == null || defaultHandler.length() == 0)
                          return null;
                      Class<? extends CallbackHandler> c = Class.forName(
                              defaultHandler, true,
                              finalLoader).asSubclass(CallbackHandler.class);
                      @SuppressWarnings("deprecation")
--- 298,308 ----
              this.callbackHandler = java.security.AccessController.doPrivileged(
                  new java.security.PrivilegedExceptionAction<CallbackHandler>() {
                  public CallbackHandler run() throws Exception {
                      String defaultHandler = java.security.Security.getProperty
                          (DEFAULT_HANDLER);
!                     if (defaultHandler == null || defaultHandler.isEmpty())
                          return null;
                      Class<? extends CallbackHandler> c = Class.forName(
                              defaultHandler, true,
                              finalLoader).asSubclass(CallbackHandler.class);
                      @SuppressWarnings("deprecation")