RFR: 8288724: Prevent NullPointerException in serviceability/tmtools/jstack/DaemonThreadTest.java if jstack process fails

[Kevin Walls]

On Mon, 20 Jun 2022 08:08:54 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:

> Can I please get a review of this test only change which updates the `DaemonThreadTest` to prevent a NPE when the `jstack` tool launched from the test fails with a non-zero exit code?

Marked as reviewed by kevinw (Committer).

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PR: https://git.openjdk.org/jdk/pull/9212