Re: Basics : JVM, JRE and Java Web Start

Lew <>
Tue, 09 Oct 2007 08:35:01 -0400
<> wrote:

I need to deploy a Java Web Start application on several clients.
Which is the oldest JRE that can run JWS ?

Andrew Thompson wrote:

Java 1.2. java 1.4 was the first version that had
JWS co-bundled with the JRE. Java 1.5 (or 1.6,
not sure) was the first Java that could not only include
the JVM and JWS, but coax the Opera browser into
recognising the JNLP files as needing to be handed to
JWS, rather than rendered as if they were HTML.

Also, Java version 1.3 (and, obviously, older) are obsolete. 1.4 is
obsolescent. Java 5 is one version old, and Java 6 is current.

Given that Java is free (of cost) for the download, if a client has Java
there's no real reason it couldn't have a current Java. Java Web Start has
the ability to check for specific versions so that if you were to target, say,
Java 5 (in order to reach the gazillions of Opera users), you could do that.
It's considerably easier to program your app if you insist that a client have
at least Java 5, which has been out for over three years already.

Three years. Plus.

Make sure you have a version that is patched for the DNS rebinding defense,
1.5.0_13 (5u13) and 1.6.0_03 (6u3) for Java 5 and 6, respectively.


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