Java Deployment Toolkit : Java Glossary

The OBJECT and EMBED tags to invoke a Java Applet so ugly, so verbose, so impossible to maintain that with JDK (Java Development Kit) 1.6.0_10, that Sun came up with a terser way to generate them with JavaScript. The problem is of course JavaScript behaves differently in every browser to compound the problem of the OBJECT and EMBED tags not being properly standardised. It is a recipe for flakiness and problems with lesser-known browsers. The saving grace is the scheme will automatically install Java if it is not already installed. I think that is just as easily, and much more reliably, handled with a Jump to Java button.

It consists of a deployJava.js script that you upload to your website. Alternatively you can link it directly from Sun’s website from either http://www.java.com/js/deployJava.js or https://www.java.com/js/deployJava.js for embedding in secure pages. The advantages of serving it locally include:

Sun cannot change the code for deployJava.js on you without warning, which might cause your website to stop working properly.
If your website is up, deployJava.js will be available, independent of whether sun.com is working.

The advantages of serving it from Sun include:

Sun’s servers are larger and better cached.
Your clients automatically get the latest Sun code, including the latest bug fixes.
Sun recommends you do it this way.

There are JavaScript methods in it you can invoke to get a list of currently-installed JRE (Java Runtime Environment) versions, trigger the installation of the latest JRE generate an Applet tag, create a JWS (Java Web Start) launch button, etc.

Learning More

Oracle’s Technote Guide on Deployment Advice : available:

on the web at Oracle.com
in the current JDK 1.7.0_02 on your local Windows J: drive.

Applet
JavaScript
Jump to Java
OBJECT and EMBED tags

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