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How does JRebel know what classes have been changed?

April 26, 2017changed classes jrebel

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How does JRebel know what classes have been changed?

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JRebel checks the file timestamps of the class files on the filesystem. If the timestamp has changed the new class is reloaded. Timestamps checks happen only when the class is used in the program. Either there is a field lookup, method invocation, static method invocation etc.