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The Apache Software Foundation's log4j logging library is one of the better logging systems around. It's both easier to use and more flexible than Java's built-in logging system. This article ...
log4j:ERROR Could not instantiate appender named "Console". log4j:ERROR A "org.apache.log4j.ConsoleAppender" object is not assignable to a "org.apache.log4j.Appender" variable.
Locking The logging framework may or may not synchronize calls to the appender. Log4J1, for example, uses one large synchronized block to call all appenders, while Log4J2 assumes they'll synchronize ...