JVM Process ID

Question:
On a POSIX-compliant system, is there a way to get the process ID ofthe JVM running the current code?

Answer:
There is no standard means of obtaining the process ID ofthe JVM. The most efficient way of implementing this is to write aJNI method that produces this information.

However, simply returning the value of the POSIX getpid() function may not be portable.Different POSIX systems have different threading models, and it ispossible on some systems for threads to receive their own processids. Therefore you must make sure that the method you write reallyproduces the process id of the JVM and not just the process ID of the currentthread.

Rather than go to the trouble of writing a JNI method that may or maynot be portable to other POSIX systems, you can do something that isguaranteed to work on any POSIX system. If you are deploying Java onPOSIX, you are probably starting your applications from a simple shellscript. The easiest way to convey the process ID of the JVM to a Javaprocess is to get the ID of the shell, $$ for Bourne-derivedshells, and pass it as an argument to the Java program. Whether it’sthe first or last argument, or conveyed with a PID flag, is up to you.When you execute the Java program, be sure to use the shell’s execcommand. This will replace the shell with the new Java process, butpreserve the same process id. For example:

#!/bin/shexec java helloworld $$
Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

technology leadership

Why the World Needs More Technology Leadership

As a fact, technology has touched every single aspect of our lives. And there are some technology giants in today’s world which have been frequently opined to have a strong influence on recent overall technological influence. Moreover, those tech giants have popular technology leaders leading the companies toward achieving greatness.

iOS app development

The Future of iOS App Development: Trends to Watch

When it launched in 2008, the Apple App Store only had 500 apps available. By the first quarter of 2022, the store had about 2.18 million iOS-exclusive apps. Average monthly app releases for the platform reached 34,000 in the first half of 2022, indicating rapid growth in iOS app development.

microsoft careers

Top Careers at Microsoft

Microsoft has gained its position as one of the top companies in the world, and Microsoft careers are flourishing. This multinational company is efficiently developing popular software and computers with other consumer electronics. It is a dream come true for so many people to acquire a high paid, high-prestige job