Re: persistent object?

From:

Andrew Thompson <andrewthommo@gmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 28 Apr 2009 17:29:53 -0700 (PDT)

Message-ID:

<3ddefc2c-9694-483c-8144-48b7901b9968@z23g2000prd.googlegroups.com>

On Apr 29, 10:03 am, Arne Vajh=F8j <a...@vajhoej.dk> wrote:

Andrew Thompson wrote:

On Apr 28, 10:15 am, Arne Vajh=F8j <a...@vajhoej.dk> wrote:

SpreadTooThin wrote:

I need a list of objects that can survive from one invocation of the
application to the next.

....

A Java application does typical not run in a sand box and are
therefore capable of writing and reading local files.

Java applets is another story.

Java applets (1.4+) have the AppletContext.getStreamKeys()*/
getStream()/setStream() methods, which might seem at
first look to be for inter-applet communication (and
can be used for that) but also, apparently, for
persistence.

....

According to http://forums.java.net/jive/thread.jspa?messageID=314755
then these streams are not really persisted but lost when the browser
is closed.

I see your right. That linked applet will lose the
changes after the browser is closed and reopened.

That is a pity for real world deployment (but handy to
know, since it was going to be a hassle to implement in
Appleteer*).

* <http://pscode.org/appleteer/>

I suppose that only leaves 'cookies' for persistence
in a sandboxed embedded applet that is pre 1.6.0_10.
<http://www.rgagnon.com/javadetails/java-0180.html>

Or, as you mentioned, the JNLP API for 1.6.0_10+
embedded applets.

--
Andrew T.
pscode.org