Java applet and chrome

How do I run Java applets? [duplicate]

Is there a way to run a Java applet on Chrome or Firefox? I get the error message on the Java test page that Java won’t run on Chrome or Firefox anymore because of the non-supported NPAPI. I have an old set of *.class files with an .html to run it, and I just want to be able to run this applet somehow. But how?

In Chrome, on Windows 10: Some applets work using «CheerpJ Applet Runner» plugin: chrome.google.com/webstore/detail/cheerpj-applet-runner/… Example: math.la.asu.edu/~kawski/vfa2 Click on CheerpJ icon. Press: «Run Applets» Wait 3 minutes, while CheerpJ dynamically converts the Applet to Javascript. Use converted Applet/Javascript, i.e. you are not running a real Applet, but a Javascript variant which may or may not work properly.

2 Answers 2

Is there a way to run a Java applet on Chrome or Firefox?

No. Applets are no longer supported in Firefox or Chrome.

Firefox no longer provides NPAPI support (technology required for Java applets)

As of September, 2018, Firefox no longer offers a version which supports NPAPI, the technology required to run Java applets. The Java Plugin for web browsers relies on the cross-platform plugin architecture NPAPI, which had been supported by all major web browsers for over a decade. The 64 bit version of Firefox has never supported NPAPI, and Firefox version 52ESR is the last release to support the technology. It is below the security baseline, and no longer supported.

Chrome no longer supports NPAPI (technology required for Java applets)

The Java Plugin for web browsers relies on the cross-platform plugin architecture NPAPI, which had been supported by all major web browsers for over a decade. Google’s Chrome version 45 and above have dropped support for NPAPI, and therefore Java Plugin do not work on these browsers anymore.

So how do I run Java applets?

Use the AppletViewer, from a JDK before Java SE 11.

The appletviewer command allows you to run applets outside of a web browser.

SYNOPSIS

appletviewer [ options ] urls . 

DESCRIPTION

The appletviewer command connects to the documents or resources designated by urls and displays each applet referenced by the documents in its own window. Note: if the documents referred to by urls do not reference any applets with the OBJECT, EMBED, or APPLET tag, then appletviewer does nothing. For details on the HTML tags that appletviewer supports, see AppletViewer Tags.

Note: The appletviewer is intended for development purposes only.

Alternatively read the Oracle White Paper (pdf) Migrating from Java Applets to plugin free Java technologies, which recommends Java Web Start:

Java Web Start has been included in the Oracle JRE since 2001 and is launched automatically when a Java application using Java Web Start technology is downloaded for the first time. The conversion of an applet to a Java Web Start application provides the ability to launch and update the resulting application without relying on a web browser

Note that both Java Applets and Java Web Start were removed completely in Java SE 11 (release September 2018). From that version on there is no (supported) way to run Applets or Web Start applications.

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How to run Java Applets in Chrome

Chrome no longer supports the technology that is required to run Java Applets in the browser.

Java Applets rely on the cross-platform plugin architecture NPAPI. This has been supported by Chrome (and other browsers) for over a decade, until Google released Chrome version 45 in July 2015.

Since then the Java Plugin has no longer worked and thus you have not been able to run Java Applets.

However, it is still possible to run Java Applets in Chrome using extensions such as the CheerpJ Applet Runner and IE tab.

CheerpJ Applet Runner

CheerpJ is an Enterprise-grade solution to modernise and preserve access to mission-critical Java Applications and Applets. It allows organisations to either preserve accessibility to existing Java Applets and Applications or modernise them to integrate within HTML5 pages (including those powered by frameworks such as React and Angular).

The CheerpJ Applet Runner is a browser extension for Chrome and Edge to run Java Applets without a Java plugin or installation. It allows you to access Java Applets in Chrome or any other modern browser, allowing you to continue using your internal or third-party Java Applet interfaces on modern IT architectures.

The CheerpJ Applet Runner can be used in Enterprise settings and deployed via Global Policy Objects on Edge or Chrome on Microsoft-based enterprise architectures.

How to Use the CheerpJ Applet Runner Chrome Extension

Using The CheerpJ Applet Runner is simple and free for non-commercial purposes. Install the extension, visit your Applet-based website, and enable the extension by clicking on its icon in the upper right corner of your browser.

1. Install the CheerpJ Applet Runner Chrome extension. Once installed, the extension appears as a shield icon in the Chrome toolbar.
2. When you visit a page with a Java applet, select the CheerpJ icon, then select Run Applets to enable the Java applets on the page.
3. Once enabled, you’ll see all of the applets run inside your Chrome browser as they normally should.

IE Tab

The IE Tab Extension can be used to display web pages using IE within Chrome, allowing you to use Java, Silverlight, ActiveX and Sharepoint.

The IE Tab does this by emulating Internet Explorer, enabling you to load your web pages with different versions of IE (IE7 – IE11).

It is worth noting that since Chrome no longer supports NPAPI, the technology which allows extensions to access local computer resources, IE Tab requires you to download a separate helper executable.

As with the CheerpJ Applet Runner, a license is required for non-personal.

How to Use IE Tab

1. Install the IE Tab Chrome extension from the Chrome web store.
2. Download and install the IE Tab Helper
3. Restart the Chrome browser and visit a page with a Java Applet.
4. Select the IE Tab icon in your browser menu to re-open the tab using the new extension.
5. You should now see the Java Applet correctly displayed in the browser.

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How can I run Java Applets in Chrome Browser?

To run Java applets on Mac and Windows in Chrome, one has to enable NPAPI starting with Chrome Version 42 and later.

Enabling NPAPI

As of Chrome Version 42, an additional configuration step is required to continue using NPAPI plugins.

1. In your URL bar, enter:
   chrome://flags/#enable-npapi
2. Click the Enable link for the Enable NPAPI configuration option.
3. Click the Relaunch button that now appears at the bottom of the configuration page.

Developers and System administrators looking for alternative ways to support users of Chrome should see this blog, in particular “Running Web Start applications outside of a browser” and “Additional Deployment Options” section.

Users on Mac and Windows who have not enable NPAPI in Chrome will see the following error message when they try to run an applet and are redirected to the Oracle website: We have detected you are using Google Chrome and might be unable to use the Java plugin from this browser. Starting with Version 42 (released April 2015), Chrome has disabled the standard way in which browsers support plugins.

Chrome on Linux

It is no longer possible to run a Java applet on Linux starting with Chrome Version 35 and later.

Starting with Chrome version 35, NPAPI (Netscape Plug-in API) support was removed for the Linux platform.

For more information, see Chrome and NPAPI (blog.chromium.org).

Firefox is the recommended browser for Java on Linux.

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How to Enable Java in Chrome

Ryan Dube is a freelance contributor to Lifewire and former Managing Editor of MakeUseOf, senior IT Analyst, and an automation engineer.

What to Know

• Newer Chrome versions don’t support Java, so you’ll need a plug-in.
• Enable Java by installing the IE Tab Chrome extension and following the on-screen instructions.
• Or, install the CheerpJ Applet Runner Chrome extension to run Java applets from within Chrome.

This article explains how to enable Java in Chrome version 42 or later now that Chrome no longer supports web pages with embedded Java applets. Solutions include using the IE Tab Chrome extension or the CheerpJ Chrome extension.

How to Use the CheerpJ Applet Runner Chrome Extension

The CheerpJ extension for Chrome lets you run Java applets inside of the Chrome browser, without even having to install Java on your system at all.

This Java applet Chrome extension is especially convenient because you don’t have to reload the web page in a new tab. You simply enable loading Java applets and all applets on the page will run as normal.

This extension requires Javascript be enabled in Chrome. To do so, go to Settings > Advanced > Privacy and security > Site Settings > Javascript, then make sure Allowed is enabled.

When you visit a page with a Java applet, select the CheerpJ icon, then select Run Applets to enable the Java applets on the page.

Once enabled, you’ll see all of the applets run inside your Chrome browser as they normally should.

The CheerpJ applet runner Chrome extension may take a little longer than other solutions when the Java applets load.

On your PC, open Chrome and select More > Settings. Under Privacy and Security, select Site settings > Cookies and other site data. Select Allow all cookies.

First, you’ll need to go to the Chrome Web Store and find an extension to load. Once you find an extension, select Add to Chrome > Add extension.

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