RFR: 8263342: Add --connect option to jhsdb hsdb/clhsdb

[Yasumasa Suenaga]

On Wed, 10 Mar 2021 21:32:44 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> Most of subcommands in jhsdb supports to connect to debug server via `--connect` command line option, however `hsdb` and `clhsdb` do not accept it.
>> 
>> Both HSDB and CLHSDB support to connect to debug server, so they should have capability to do it via command line option.
>> 
>> I also filed [CSR for this issue](https://bugs.openjdk.java.net/browse/JDK-8263345). Please review it as well.
>
> src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/CLHSDB.java line 157:
> 
>> 155:             } catch (NumberFormatException e) {
>> 156:                 // Attempt to connect to remote debug server
>> 157:                 debugServerName = args[0];
> 
> I assume this change to no longer support just specifying an execPath is not exposed to the user, unless they are invoking the CLHSDB class directly from the command line.

Yes, but this code would be run from `SALauncher::runCLHSDB`, so we need to change.
https://github.com/YaSuenag/jdk/blob/JDK-8263342/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/SALauncher.java#L282

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PR: https://git.openjdk.java.net/jdk/pull/2908