About synchronized and Reentrant Lock

A memo when reading the source when sharing logback between wars

--About the difference between synchronized block and Reentrant Lock. -More flexible and scalable locks in JDK 5.0 -Difference between lock and file lock

In logback

When outputting a file, finally ch.qos.logback.core.OutputStreamAppender #writeBytes (bite []) Write with /OutputStreamAppender.html#writeOut (E)). Locking is performed by ReentrantLock, including file opening processing, etc., and FileLock is Not performed.

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