Commons Daemon

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{{Infobox software

| name = Commons Daemon

| logo =

| screenshot =

| caption =

| developer = Apache Software Foundation

| latest release version = 1.3.4{{cite web | url=https://commons.apache.org/proper/commons-daemon/changes-report.html | title=Daemon – Apache Commons Daemon Release Notes }}

| latest release date = {{Start date and age|2023|05|10}}

| operating system = Cross-platform

| programming language = Java, C

| genre = Library

| license = Apache License 2.0

| website = {{URL|http://commons.apache.org/daemon}}

}}

Commons Daemon, formerly known as JSVC, is a Java software library belonging to the Apache Commons Project.

Daemon provides a portable means of starting and stopping a Java Virtual Machine (JVM) that is running server-side applications. Such applications often have additional requirements compared to client-side applications. For example, the servlet container Tomcat 4 would need to serialize sessions and shutdown web applications before the JVM process terminates.

Daemon comprises 2 parts: a native library written in C that interfaces with the operating system, and the library that provides the Daemon API, written in Java.

There are two ways to use Commons Daemon: by implementing the daemon interface or by calling a class that provides the required methods for daemon. For example, Tomcat-4.1.x uses the daemon interface and Tomcat-5.0.x provides a class whose methods are called by JSVC directly.

{{Apache Software Foundation}}