Thread.single_step field, anything using it?

Alan Bateman Alan.Bateman at
Tue Dec 19 11:06:01 UTC 2017

I've been going through the fields in java.lang.Thread and I'm wondering 
if this field can be removed:

     /* Whether or not to single_step this thread. */
     private boolean     single_step;

This field was used in the original Classic VM (pre-OpenJDK history). It 
doesn't appear to be used in the HotSpot VM.

Does anyone know of any reason to keep it? Are there other VMs using it 
by any chance?


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