Java Web Start vs. Embedded Java Applet: Understanding the Differences

What are the main differences between Java Web Start and embedded Java applets?

Java Web Start and embedded Java applets are two technologies used to deliver Java applications over the web. Both serve unique purposes and come with distinct capabilities. Understanding their differences is crucial for selecting the right method for deploying Java applications.

// Use this command to launch a Java Web Start application (JNLP file example)
javaws http://example.com/myapp.jnlp

Causes

• Java Applets run in a web browser environment, while Java Web Start applications are launched outside the browser.
• Java Web Start provides a richer user experience with full access to the local system and resources, whereas applets are subject to browser security restrictions.
• Java Applets require a Java plugin in the browser, which may not be supported in many modern web browsers, while Java Web Start applications do not depend on the browser's Java plugin.
• Web Start applications can be cached and updated automatically, while applets may require users to refresh to see updates.

Solutions

• Use Java Web Start for applications that require deeper system integration or access to local resources.
• Lean towards Java applets only when browser compatibility is guaranteed and a quick-playing in-browser experience is essential.
• Innovate with alternatives such as JavaScript frameworks or modern web technologies that don’t require Java, as applet support is declining.

Mistake: Assuming Java applets work in all browsers.

Solution: Verify current browser support for Java applets and consider transitioning to newer technologies.

Mistake: Neglecting to update Java Web Start JNLP files after changes.

Solution: Regularly review and update JNLP files to ensure users receive the latest versions of your applications.