[jdk16] Integrated: 8259027: NullPointerException in makeMappedSegment due to NULL Unmapper when length of segment is 0
mcimadamore at openjdk.java.net
Tue Jan 5 16:17:59 UTC 2021
On Tue, 5 Jan 2021 12:56:49 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:
> When the size of the memory map is zero, FileChannelImpl returns a `null` Unmapper - this creates issues to the mapped memory segment implementation.
> To fix, I've created an empty mapped segment class which is initialized to sensible defaults, and whose implenentation of force/load etc. do nothing.
> We already had a test for this condition - but the test was missing the `@Test` annotation, so it was not run! I've now beefed up the test a bit to make sure that mapped segment operations do not throw.
This pull request has now been integrated.
Author: Maurizio Cimadamore <mcimadamore at openjdk.org>
Stats: 54 lines in 2 files changed: 51 ins; 1 del; 2 mod
8259027: NullPointerException in makeMappedSegment due to NULL Unmapper when length of segment is 0
Reviewed-by: chegar, uschindler
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