Java applet stopped working after update to JRE 7u21

Question

My java applet stopped working once JRE was updated to 7u21.

Short summary:

• The Exceptions I get are: netscape.javascript.JSException and
  java.l

Answer 1

It's not possible to set the attributes of an applet to work both on versions after 7.0.21 and below it.

Trusted-Library: true

attribute works for the ones below 7.0.21 which causes a security dialog to be displayed (and most probably your code to be blocked) after 7.0.21. If you only put

Caller-Allowable-Codebase: *.yourdomain.com

to your manifest file, it starts to work fine with the versions after 7.0.21 but this time it stops with the versions below 7.0.21. This is a huge mess.

However they've fixed this ill behaviour with the latest version (7.0.51). So I suggest to use both attributes (Trusted-Library and Caller-Allowable-Codebase) which will work for Java 6 and 7.0.51. I don't think there is a solution for the ones between 7.0.21 and 7.0.45. (I do not support them, we ask our clients to upgrade to 7.0.51).

https://blogs.oracle.com/java-platform-group/entry/7u45_caller_allowable_codebase_and