src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/taglets/TagletManager.java

*** 250,261 ****
                      ((StandardJavaFileManager) fileManager).setLocation(TAGLET_PATH, paths);
                  }
              }
              tagClassLoader = fileManager.getClassLoader(TAGLET_PATH);
              Class<?> customTagClass = tagClassLoader.loadClass(classname);
!             @SuppressWarnings("deprecation")
!             Object instance = customTagClass.newInstance();
              Taglet newLegacy = new UserTaglet((jdk.javadoc.doclet.taglet.Taglet)instance);
              String tname = newLegacy.getName();
              Taglet t = customTags.get(tname);
              if (t != null) {
                  customTags.remove(tname);
--- 250,260 ----
                      ((StandardJavaFileManager) fileManager).setLocation(TAGLET_PATH, paths);
                  }
              }
              tagClassLoader = fileManager.getClassLoader(TAGLET_PATH);
              Class<?> customTagClass = tagClassLoader.loadClass(classname);
!             Object instance = customTagClass.getConstructor(new Class<?>[0]).newInstance((Object[])null);
              Taglet newLegacy = new UserTaglet((jdk.javadoc.doclet.taglet.Taglet)instance);
              String tname = newLegacy.getName();
              Taglet t = customTags.get(tname);
              if (t != null) {
                  customTags.remove(tname);