On Wed, 18 Nov 2020 10:37:43 GMT, Lin Zang <lz...@openjdk.org> wrote:
>> So I assume then that the `op->arg(2)` reference will return `NULL` when an >> older `jmap` is used? Is that correct? > > Hi @plummercj, > For old jmap, if "gz" option is used in commandline, it prompt usage > info indicating that option is illegal. > if "gz" option is not used, the op->arg(2) will be an empty string "", > which is set from the attacher side in the method execute() of > VirtualMachineImpl.java. Ok, I see now that 3 args are always written, even if empty, so you at least get a "" if there is no value for the argument position. ------------- PR: https://git.openjdk.java.net/jdk/pull/1251
