1. In your URL bar, enter: chrome://flags/#enable-npapi
2. Click the Enable link for the Enable NPAPI configuration option.
3. Click the Re-launch button that now appears at the bottom of the configuration page.
Please refer to this Java FAQ for more information on enabling NPAPI.
From Chrome 45, Google has completely removed all support for NPAPI plugins such as Java. PSM sessions cannot be ran from Chrome 45+. The user will receive the error "This site uses a plugin (Java(TM)) this is unsupported.".