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Apache Log4j is a Java-based logging utility originally written by Ceki Gülcü. It is part of the Apache Logging Services, a project of the Apache Software Foundation.
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.
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.
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.
Log4j: Apache Log4j; Log4net: provides logging services for .NET. Log4php: a logging framework for PHP. Apache Lucene Committee Lucene Core: a high-performance, full-featured text search engine library; Solr: enterprise search server based on the Lucene Java search library
Jakarta is named after the conference room at Sun Microsystems where the majority of discussions leading to the project's creation took place. [3] At the time, Sun's Java software division was headquartered in a Cupertino building where the conference room names were all coffee references.
Apache Jena is an open source Semantic Web framework for Java.It provides an API to extract data from and write to RDF graphs. The graphs are represented as an abstract "model".
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.