Is it possible to run a java application/program forever?

Question

Hi,
Is it possible to run a java program forever?
if so please reply how it is possible
thanks in advanced.

Answer 1

There was a computer with many processes.
Some processes came and went: they exited either voluntarily by calling exit(2),
simply returned from their main method, or were terminated by a signal
like SEGV, TERM, and the dreaded uncatchable KILL.
Other processes strove to eternal running: they detatched themselves from their
controlling terminals, ignored the HUP signal or even interpreted
it as an occasion to reread their configuration instead of
taking it as a notification on the line's "hanging up"
or more generally the controlling pseudo or virtual terminal's being closed.
Resources were acquired and released, processes came and went, some stayed though.
Long-running processes were experienced to writing ever growing "access" and "error" logs.
Rumors went around about "garbage collection" and "memory leakage".
The processes started to think: "What if not all resources get released?
What if the available memory shows an overall shrinking trend
and in the long term it will be totally exhausted?
What if the disk space get freed in a lesser pace as it gets consumed?
How shall we survive in a Universe where there is no space is left
even for sysem logs?"
The processes made the observation that they were identifed by their process id's
(pid of the integral type pid_t), and the only way they to create a process
was the fork(2) system call, which returned 0 to the child,
the positive pid of the child to the parent, and a negative value on error.
Thus the pid could only be postive numbers.
The processes observed the one "init" with pid=1, the smallest thinkable pid.
They asked: "Will it run forever? If not, what will become of us?
If a process exits without wait(2)-ing for its children,
who will inherit it if "init" no longer exists?"
They came to the conclusion that no process could have existed before this one,
so their universe began once, was not infinite in the past.
They called this event (which lead to the existance of the process "init"
and actually their whole universe) "The Big Bang" or "The Big Boot".
"Is it possible that different, parallel universes exist?
Is it possible that different, parallel universes arise with different laws and system API's?"
- they asked.
Will their universe exist for eternity?
If yes, in what conditions? Will it eventually run out of the resources,
will it become cool and frozen with no memory, no available disk space,
with no resources left drifting along with no activity?
Or will their universe come to an end, to a condition where
signals (TERM and then KILL) fly to all processes,
all file system get umounted, all activity stops?
"Big Crash" or the "Big Shutdown" they called this scenario.