spring-projects/spring-boot — pull request #1284 by monsterzz (2014-07-23 13:02:39+00:00)
Title: Improve LaunchedURLClassLoader performance on JVM 7

Detects presence of `getClassLoadingLock` method and uses it when
available. In case of JVM 6 uses plain old synchronization on `this`.

This patch makes assumption of that spring-boot compiles on JDK >= 7.