Better tools for adjusting to strong encapsulation

Simon Nash simon at
Fri Mar 24 17:48:04 UTC 2017

On 24/03/2017 13:02, Alan Bateman wrote:
> On 24/03/2017 12:01, Peter Levart wrote:
>> :
>> Just a reminder that System.err field is "writable" and therefore 
>> System.setErr(PrintStream) can be used to redirect output to execute 
>> arbitrary code...
> That's right, it needs to captured at startup or sent directly to stderr.
> -Alan
I think this means that at startup, an application could do
  PrintStream sysErr = System.err;
where myErr is an application subclass of PrintStream that filters out any
unwanted warnings produced by JDK code and sends all other output to sysErr.
Would this work?


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