Overlay and transitional restrictions of CLEAR_ON_DESELECT?

In Java Card (I'm interested in Classic downto 2.1.1), transitional (RAM) required by a cmdlet is generally attributed to install by makeTransientByteArray(). This method accepts a parameter CLEAR_ON_RESET or CLEAR_ON_DESELECT. The latest comes with warning that
CLEAR_ON_DESELECT transitional objects are only available when the applet which created the object is in the same context as the applet that is currently selected.
The Java Card runtime environment throws a SecurityException exception if a transitional object CLEAR_ON_DESELECT is available when the selected applet is not in the same context as the applet that created the object.
My reading is that CLEAR_ON_DESELECT (but not CLEAR_ON_RESET) would allow the duration of superimposed transients (assigned during installation as shown above) between two cmdlets, as long as they are not selected at the same time, while several applets allocating m ~ j ~ bytes would consume about max (m ~ j ~) transitional bytes, rather than sum (m ~ j ~).

Question: Is this overlay mechanism sometimes implemented in the runtime? If so, are there any cards with a runtime is not its implementation? If so, is there a way to tell other than by experience, maybe the version of Java Card is announced?

Another question: what exactly is average in the mentioned restriction "context"? In particular, is a transitional CLEAR_ON_DESELECT can be used by another instance of the applet, it shares with the instance that was allocated by the mechanism shown here?
http://StackOverflow.com/a/14257052/903600
Note: I'm not interested in sharing the content of the transient, that avoiding the two assignments, to work around a possible lack of recovery by the runtime.

fgrieu wrote:
Thanks lexdabear, I take your answer as involving layering occurs in some cases and how to check in a context of JCOP.

But is this universal, and what is the rule?

That's how I interpret the specifications and also implemented in the JCOP.

I am told something on the melody that at least some execution environments, recovery occurs selectively for transients allocated different packages.

It is true about the packages. COD is allocated per package, no applet.

But I can't seem to find a reference or an accurate description of this rule/mechanism.

I read it in the snippet that you pasted above.
>

In addition, the second question about what "context" means in the mentioned restriction remains unanswered. Of course, I can try, but again, I have fear that could vary from one run to another time.

Context is relevant here where SIO, logical channel and multiselectable are used.

Tags: Java

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