By late 2015, many browser vendors have either removed or announced timelines for the removal of standards based plugin support, eliminating the ability to embed Silverlight, Java, Flash and other standards-based plugin technologies.
Oracle has deprecated the Java browser plugin in Java Standard Edition Development Kit 9 (JDK 9). Deprecation is a warning for developers to stop using this technology. JRE 9 will continue to provide the Java Plugin and support launching applets on browsers that still offer standard plugin support, but is only available for limited use and not recommended. This browser plugin will be removed from the Oracle JDK and JRE in a future Java SE release. Developers and users who want to learn more about this planned change can find out more in this blog post.
Users of plugin based applications should contact their vendor to ask them what alternative plans will be made available.
» Moving to a Plugin-free Web (Java Platform Group blog)