RFR: 8282712: VMConnection.open() does not detect if VM failed to be created, resulting in NPE

[Chris Plummer]

On Sat, 12 Aug 2023 03:56:05 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> VMConnection.open() expects launchTarget(), attachTarget(), and listentTarget() to either throw an exception or return a valid VirtualMachine instance. Instead they were catching certain exceptions and returning null, which resulted in an NPE in VMConnection.open(). I've fixed it so these APIs now rethrow any caught exception and never return null.
> 
> Tested with tier1 and also running the following 10x each on linux-x64, macosx-aarch64, and windows-x64:
> 
> test/hotspot/jtreg/vmTestbase/nsk/jdwp/
> test/hotspot/jtreg/vmTestbase/nsk/jdb/
> test/hotspot/jtreg/vmTestbase/nsk/jdi
> test/jdk/com/sun/jdi

Thank you Alex and Serguei!

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PR Comment: https://git.openjdk.org/jdk/pull/15255#issuecomment-1682451781