What does the Java Applet security warning “JAR file manifest does not contain the Permissions attribute”mean?

Question

I have a Java Applet which needs access to the local filesystem of the client. I have created a simple certificate for my own (it is NOT certified by Verisign,Commodo, ...). I s

Answer 1

I've met this warning while updating the signature on a pre-existing applet (a component that interfaces a user smartcard, and so to work correctly requires to be signed with a "strong" certificate).

Adding also the codebase attribute, e.g: "Codebase: xyz.com" actually makes the warning disappear (note that the original warning text was refering, as in this case, to issues related to the "Permission" attribute not the codebase one...).

It's probably a bug in the jre?