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BTrace: A safe, dynamic tracing tool for the Java platform

There is a newer version: 2.2.5

#!/usr/sbin/dtrace -s

btrace$1:::event 
/ 
  copyinstr(arg0) == "jthreadstart" &&
  arg1 != NULL
/
{
  printf("From DTrace: Java Thread '%s' started\n", copyinstr(arg1));
}