Applet versioning problem

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Kevin CH - 19 Feb 2007 21:11 GMT

We have certain Applets written on JDK1.2.2, and a recent upgrade of
JRE on the workstation to 1.6 made the Applets unable to load on the
workstations. The root cause of the problem shown by Java Console is
the following:

>>java.lang.NoClassDefFoundError: sun/plugin/protocol/PluginProxyHandler
>>    at DCSAppInvoker.getProxyInfo(DCSAppInvoker.java:200)
>>    at DCSAppInvoker.init(DCSAppInvoker.java:73)
>>    at sun.applet.AppletPanel.run(Unknown Source)
>>    at java.lang.Thread.run(Unknown Source)

One solution I've come up so far is installing JDK1.2 on the
workstations and configure Java Plugin to force JRE1.6 to execute the
applet using JRE1.2 (e.g., java -version:1.2 MyClass) but that's very
clumsy.

Anyone knows any other ways to reconcile this problem without
modification to the code? Thanks in advance.

Regards,

Kevin

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mickey - 19 Feb 2007 21:24 GMT

> We have certain Applets written on JDK1.2.2, and a recent upgrade of
> JRE on the workstation to 1.6 made the Applets unable to load on the
[quoted text clipped - 18 lines]
>
> Kevin

hi.. one solution is very much inn
U know applets r out of date
USE FRAMES INSTED OF APPLETS
everything u do in applets ..u can do it in frames
try this out ..
its much =better

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Andrew Thompson - 19 Feb 2007 23:02 GMT

> We have certain Applets written on JDK1.2.2, and a recent upgrade of
> JRE on the workstation to 1.6 made the Applets unable to load

...

> One solution I've come up so far is installing JDK1.2 on the
> workstations and configure Java Plugin to force JRE1.6 to execute the
> applet using JRE1.2

...

> Anyone knows any other ways to reconcile this problem without
> modification to the code?

Java web start. It can launch applets(1),
and handle the versioning(2) for you.

1) <http://www.physci.org/jws/#jtest>
2) <http://www.athompson.info/family/thompson-1.5-all.jnlp>

Andrew T.

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Mickey Segal - 20 Feb 2007 00:13 GMT

> Java web start. It can launch applets(1),
> and handle the versioning(2) for you.

How common is it for people in locked-down environments to be blocked from
using Java Web Start?

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Applet versioning problem

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