Review request for 6612680 (Remove classloader dependency on jkernel) (original) (raw)

Mandy Chung Mandy.Chung at Sun.COM
Sun Oct 4 06:03:51 UTC 2009

Alan, Karen,

Can you review the fix for: 6612680: Remove classloader dependency on jkernel

Webrev at: http://cr.openjdk.java.net/~mchung/6612680/

java.lang.ClassLoader and sun.misc.Launcher have explicit dependencies on the jkernel code. While the performance impact of this is minimal (the calls basically amount to nops when the JRE is complete), it's still undesirable.

To eliminate the static dependency on jkernel, this adds a boot classloader hook interface that is invoked in the ClassLoader findClass, getSystemResource, and other methods. The hook is null by default. The jkernel VM will call the static
DownloadManager.setBootClassLoaderHook() method and only the jkernel environment will have a non-null boot class loader hook. Since jkernel is a separate build including the bundles and VM, as we discussed, the jkernel VM is a reasonable place to inject the DownloadManager as the boot class loader hook.

I'm hoping to make TL b74 which is code freeze by 10 pm PT Monday.

Thanks Mandy

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