SpringBootVersion fails with a NullPointerException if Package has no implementation version and the ProtectionDomain returns a null CodeSource

[wilkinsona]

java.security.ProtectionDomain.getCodeSource() may return null but SpringBootVersion assumes that it will not do so. We should review other usages of getCodeSource() and check that they are null-safe while we're at it.

[pkostrzewa]

Can I work on this one?

[wilkinsona]

Thanks for the offer, @pkostrzewa, but as shown by the issue being assigned we're already working on this one.

[wilkinsona]

This is a regression in 2.2.0.M3 that I did not spot when I merged #16182.