Re: persistent object?

From:
=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>
Newsgroups:
comp.lang.java.programmer
Date:
Tue, 28 Apr 2009 20:03:37 -0400
Message-ID:
<49f79952$0$90262$14726298@news.sunsite.dk>
Andrew Thompson wrote:

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

SpreadTooThin wrote:

I need a list of objects that can survive from one invocation of the
application to the next.
Is this doable in Java or does that break sand box rules?
In my case I simply need a list of structures to exist and be reloaded
if the application is quit and restarted.

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. They are limited to around 63-64Kb.

*
<http://java.sun.com/javase/6/docs/api/java/applet/AppletContext.html#getStreamKeys()>


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.

Arne

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