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The scope of this package is to define an API in line with the current Java Platform APIs to support an alternative invocation mechanism which could be used instead of the public static void main(String[]) method. This specification covers the behavior and life cycle of what we define as Java daemons, or, in other words, non interactive Java applications.
Java daemon launcher.
Many Apache projects support interaction with a relational database. Creating a new connection for each user can be time consuming (often requiring multiple seconds of clock time), in order to perform a database transaction that might take milliseconds. Opening a connection per user can be unfeasible in a publicly-hosted Internet application where the number of simultaneous users can be very large. Accordingly, developers often wish to share a "pool" of open connections between all of the application's current users. The number of users actually performing a request at any given time is usually a very small percentage of the total number of active users, and during request processing is the only time that a database connection is required. The application itself logs into the DBMS, and handles any user account issues internally.
Many projects read XML configuration files to provide initialization of various Java objects within the system. There are several ways of doing this, and the Digester component was designed to provide a common implementation that can be used in many different projects
An implementation of standard interfaces and abstract classes for javax.servlet.jsp.el which is part of the JSP 2.0 specification.
Commons Exec is a library for dealing with external process execution and environment management in Java.
The javax.servlet package lacks support for RFC-1867, HTML file upload. This package provides a simple to use API for working with such data. The scope of this package is to create a package of Java utility classes to read multipart/form-data within a javax.servlet.http.HttpServletRequest.
Commons-IO contains utility classes, stream implementations, file filters, and endian classes. It is a library of utilities to assist with developing IO functionality.
Defines a simple interpreter of an expression language called XPath. JXPath applies XPath expressions to graphs of objects of all kinds: JavaBeans, Maps, Servlet contexts, DOM etc, including mixtures thereof.
The standard Java libraries fail to provide enough methods for manipulation of its core classes. The Commons Lang Component provides these extra methods. The Commons Lang Component provides a host of helper utilities for the java.lang API, notably String manipulation methods, basic numerical methods, object reflection, creation and serialization, and System properties. Additionally it contains an inheritable enum type, an exception structure that supports multiple types of nested-Exceptions and a series of utilities dedicated to help with building methods, such as hashCode, toString and equals.