PING: RFR: 8165736: Error message should be shown when JVMTI agent cannot be attached

[Yasumasa Suenaga]

PING: Could you review and sponsor it?

>    http://cr.openjdk.java.net/~ysuenaga/JDK-8165736/webrev.00/


Thanks,

Yasumasa


On 2017/09/29 13:24, Yasumasa Suenaga wrote:
> Hi all,
> 
> If we try to attach invalid JVMTI agent via JVMTI.agent_load dcmd, we
> will get "Command executed successfully". However, it implies error in
> JVMTIAgentLoadDCmd.
> This message is from JCmd.java when jcmd does not receive any output
> from target VM.
> 
> I think HotSopt/jcmd should return useful error message to users to
> understand the cause of failure.
> 
> I uploaded webrev for this issue. Could you review it?
> 
>    http://cr.openjdk.java.net/~ysuenaga/JDK-8165736/webrev.00/
> 
> 
> This change is work fine on Fedora 26 x86_64 as following  jtreg testcases:
> 
>    - hotspot/jtreg/serviceability/attach
>    - hotspot/jtreg/serviceability/dcmd/jvmti
>    - jdk/com/sun/tools/attach
> 
> I cannot access JPRT. So I need a sponsor.
> (I cannot test it on other platforms.)
> 
> 
> Thanks,
> 
> Yasumasa
>