On Wed, 21 Feb 2024 21:13:36 GMT, Alex Menkov <[email protected]> wrote:
> VirtualMachine.loadAgentPath/loadAgentLibrary can fail with
> AgentLoadException in 2 cases:
> - attach listener returns error; in the case the exception is thrown from
> HotSpotVirtualMachine.processCompletionStatus (called from
> HotSpotVirtualMachine.execute);
> - attach listener returns success, but reply does not contain Agent_onAttach
> return code ("return code: %d" message).
>
> before jdk21 if attach listener fails to load required library, it returned
> error (case 1)
> from jdk21 attach listener always returns success (case 2)
> Both cases are ok, but for 2nd case HotSpotVirtualMachine.loadAgentLibrary
> read only single line of the response message, so exception message didn't
> contain error details.
>
> The fix updates HotSpotVirtualMachine.loadAgentLibrary to read the whole
> response message.
> Walking through the code, fixed some other minor things in attach listener
> and attach API implementation (commented in the code)
>
> Testing:
> - test/jdk/com/sun/tools;
> - tier1,tier2,tier5-svc
This pull request has now been integrated.
Changeset: fc67c2b4
Author: Alex Menkov <[email protected]>
URL:
https://git.openjdk.org/jdk/commit/fc67c2b4f17216d4adcc0825d0f378ae4f150025
Stats: 150 lines in 6 files changed: 109 ins; 16 del; 25 mod
8325530: Vague error message when com.sun.tools.attach.VirtualMachine fails to
load agent library
Reviewed-by: sspitsyn, cjplummer
-------------
PR: https://git.openjdk.org/jdk/pull/17954
