Request: Remove System.out check from Class.checkInitted()

David Holmes david.holmes at
Thu Dec 19 12:06:06 UTC 2013

On 19/12/2013 9:59 PM, Alan Bateman wrote:
> On 19/12/2013 10:13, David Holmes wrote:
>> Not necessarily. The question is, are there any code paths that lead
>> to checkInitted being called after  setOut0(newPrintStream(fdOut,
>> props.getProperty("sun.stdout.encoding"))) but before the call to
>> sun.misc.VM.booted(). If so these would fail under the proposed change.
>> The initialization sequence is fragile and intimately tied to the
>> Hotspot VM - ie the VM initialization process initiates the core class
>> initialization. In a "normal" initialization System is initialized
>> before Class and Class must be initialized before checkInitted can be
>> called, so this doesn't trigger initialization of System.
>> I also don't see how System.out being null can be valid
>> post-initialization state given the call to
>> setOut0(newPrintStream(fdOut, props.getProperty("sun.stdout.encoding")))
> It would be unusual to change it later with System.setOut but it is
> possible.
> In any case, using VM.isBooted is the normal way to check if system
> initialization has completed.

Yes but it may not be sufficient in this case. As I said we have to be 
sure checkInitted can not be called by anything between the setting of 
out to non-null and the call to booted().


> -Alan.

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