Enable parallel loading in DecoratingClassLoader and subclasses on JDK 7+ [SPR-12285]

[spring-projects-issues]

Brian Clozel opened SPR-12285 and commented

According to JDK7's documentation, the Classloader class added new methods to add parallel classloading capabilities.
This is automatically done when using directly a Classloader instance, but not the case when using a subclass.

Spring is using several helper subclasses in its codebase (see DecoratingClassLoader) - so conditionally calling registerAsParallelCapable (when JDK7+ is detected) could improve class loading performance.

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Affects: 4.1.1

Referenced from: commits 05c995c