See Asynchronous Logging Performance for details. In multi-threaded scenarios Asynchronous Loggers have 18 times higher throughput and orders of magnitude lower latency than Log4j 1.x and Logback. Log4j 2 contains next-generation Asynchronous Loggers based on the LMAX Disruptor library. Other constructs such as Markers, log Levels, and ThreadContext (aka MDC) are fully supported. The underlying logging implementation must implement the Terminable interface for the method to have effect. The Log4j API provides a LogManager.shutdown() method. In addition to the “parameterized logging” format supported by SLF4J, the Log4j API also supports events using the syntax as well printf-style messages. The Log4j API provides many more logging methods than SLF4J. The Log4j API supports lambda expressions. The Log4j API supports logging Messages instead of just Strings. The Log4j API has several advantages over SLF4J: 1. The Log4j API is a logging facade that may, of course, be used with the Log4j implementation, but may also be used in front of other logging implementations such as Logback. This allows the Log4j team to improve the implementation safely and in a compatible manner. The API for Log4j is separate from the implementation making it clear for application developers which classes and methods they can use while ensuring forward compatibility. Please refer to the Security page for details and mitigation measures for these security issues. Please refer to the Security page for details and mitigation measures for older versions of Log4j. #Plugins java ver 7 release 51 download upgrade#Upgrade to Log4j 2.3.2 (for Java 6), 2.12.4 (for Java 7), or 2.17.1 (for Java 8 and later) Reference This issue is fixed by limiting JNDI data source names to the java protocol in Log4j2 versions 2.17.1, 2.12.4, and 2.3.2. #Plugins java ver 7 release 51 download code#DetailsĪpache Log4j2 versions 2.0-beta7 through 2.17.0 (excluding security fix releases 2.3.2 and 2.12.4) are vulnerable to a remote code execution (RCE) attack where an attacker with permission to modify the logging configuration file can construct a malicious configuration using a JDBC Appender with a data source referencing a JNDI URI which can execute remote code. Summary: Apache Log4j2 vulnerable to RCE via JDBC Appender when attacker controls configuration. Important: Security Vulnerability CVE-2021-44832 Apache Log4j 2 is an upgrade to Log4j that provides significant improvements over its predecessor, Log4j 1.x, and provides many of the improvements available in Logback while fixing some inherent problems in Logback’s architecture.
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