Explain why to use Apache Log4j?

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what is the best way to migrate from java.util logging to log4j?

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what does WARN and TRACE level indicates in log4j?

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what are the two static methods for obtaining a logger object?

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why do you get multiple copies of the message in log file sometime?

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what is package level logging in log4j?

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what are the format characters used in log4j?

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what is layouts in log4j?

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what are the logging methods provided by logger class?

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Inside logger component what are the different log levels?

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What is Camel?

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Is camel an esb?

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Does camel link method invocation of bean at compile time or runtime?

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What is the content of Exchange in camel?

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What jars do I need?

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