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Apache Log4j 2 is the successor of Log4j 1 which was released as GA version in July 2015. The framework was rewritten from scratch and has been inspired by existing logging solutions, including Log4j 1 and java.util.logging.
Log4j 2 provides both an API and an implementation. The API can be routed to other logging implementations equivalent to how SLF4J works. Unlike SLF4J, the Log4j 2 API logs Message [2] objects instead of Strings for extra flexibility and also supports Java Lambda expressions. [3] JCL isn't really a logging framework, but a wrapper for one.
Log4Shell (CVE-2021-44228) is a zero-day vulnerability reported in November 2021 in Log4j, a popular Java logging framework, involving arbitrary code execution. [2] [3] The vulnerability had existed unnoticed since 2013 and was privately disclosed to the Apache Software Foundation, of which Log4j is a project, by Chen Zhaojun of Alibaba Cloud's security team on 24 November 2021.
Simple Logging Facade for Java (SLF4J) provides a Java logging API by means of a simple facade pattern.The underlying logging backend is determined at runtime by adding the desired binding to the classpath and may be the standard Sun Java logging package java.util.logging, [2] Log4j, Reload4j, Logback [3] or tinylog.
Apache log4j 1.3 added many interesting features, but was compatibility with log4j 1.2 was problematic. Many features original developed for log4j 1.3 have been back-ported as companions for log4j 1.2. No further development is anticipated. Apache log4j 2.0 is an experimental development branch for logging services designed for Java 5 and later.
A document type declaration, or DOCTYPE, is an instruction that associates a particular XML or SGML document (for example, a web page) with a document type definition (DTD) (for example, the formal definition of a particular version of HTML 2.0 - 4.0). [1]
Disruptor is a library for the Java programming language that provides a concurrent ring buffer data structure of the same name, developed at LMAX Exchange. [1] It is designed to provide a low-latency, high-throughput work queue in asynchronous event processing architectures.
Apache Wicket, commonly referred to as Wicket, is a component-based web application framework for the Java programming language conceptually similar to JavaServer Faces and Tapestry.