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List:       openjdk-2d-dev
Subject:    [OpenJDK 2D-Dev] Integrated: 6847157: java.lang.NullPointerException: HDC for component at
From:       Sergey Bylokhov <serb () openjdk ! java ! net>
Date:       2020-11-09 6:39:59
Message-ID: 9WZ-kwNDHofanThX6JmcZF1a8tPO1OOCg25CXXXwdYc=.698a17f0-4ddf-4618-a8e7-5c73892be27b () github ! com
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On Mon, 26 Oct 2020 19:45:49 GMT, Sergey Bylokhov <serb@openjdk.org> wrote:

> This is the fix for one suspicious exception which rarely but time to time occurred \
> on the test systems. As described in a few bug reports the use-cases could be quite \
> different, but I was able to reproduce it in one of them. 
> Steps to reproduce:
> 1. We draw to the frame for the first time or we draw to the frame on the thread \
> where we never draw before 2. As part of step 1. we start initialization of the \
> surface data bounded to this frame for that thread, in the native method 3. jtreg \
> decided to kill the test because the main method ends 4. As part of step 2. we \
> request HDC for the frame via sendMessage which do nothing since AWT is \
> stopping/dies -> HDC=NULL 5. As part of step 1. we try to draw to the surface -> \
> HDC is NULL -> NPE is thrown 
> The solution is to mark the surface at step 4. as invalid:
> - If the AWT will die this surface will never be used and no exception occurs
> - If the application will continue to work and this surface will be accessed then \
> we will throw InvalidPipeException in attempts to recreate the surface and all \
> related data.

This pull request has now been integrated.

Changeset: 2d6c28db
Author:    Sergey Bylokhov <serb@openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/2d6c28db
Stats:     94 lines in 2 files changed: 93 ins; 0 del; 1 mod

6847157: java.lang.NullPointerException: HDC for component at \
sun.java2d.loops.Blit.Blit

Reviewed-by: prr

-------------

PR: https://git.openjdk.java.net/jdk/pull/870


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