RFR (XS): 8172261: [JVMTI] Specification for early VM start event needs to lower expectations in relation class loading

[David Holmes]

Forgot to state this has gone through CCC approval.

David

On 18/01/2017 11:03 AM, David Holmes wrote:
> Bug: https://bugs.openjdk.java.net/browse/JDK-8172261
>
> webrev: http://cr.openjdk.java.net/~dholmes/8172261/webrev/
>
> This is a simple relaxation of the spec in regards to the new "early VM
> start" event, to explicitly allow for the possibility that arbitrary
> class loading during this "early VM start" time may fail in extreme ways.
>
> Changes are easier to see in text than webrev:
>
> Extend:
>
> The VM is capable of executing bytecode but it may not have initialized
> to the point where it can load classes in modules other than java.base.
>
> to read:
>
> The VM is capable of executing bytecode but it may not have initialized
> to the point where it can load classes in modules other than java.base,
> or even arbitrary classes in java.base.
>
> ---
>
> Replace:
>
> Care should also be taken with JNI FindClass as it may not be possible
> to load classes that are not in the java.base module.
>
> with:
>
> Extreme care should also be taken with JNI FindClass as it may not be
> possible to load classes, and attempts to do so may result in
> unpredictable behavior, maybe even stability issues on some VM
> implementations.
>
> ---
>
> Thanks,
> David