Update `SpringBootConfigurationFactory` so that it no longer attempts
to get a `LoggingSystem`.
The recent `LoggingSystem` update means makes use of the
`SpringFactoriesLoader` class to load candidate logging systems.
Unfortunately, the `SpringFactoriesLoader` class creates a `Logger`
which (when using Log4J2) causes `SpringBootConfigurationFactory` to
run. Calling `LoggingSystem.get` from `SpringBootConfigurationFactory`
results in a recursive call to `SpringFactoriesLoader` which hasn't
yet been fully initialized. We then see an NPE caused by a `null`
`cache`.
This update removes the call to `LoggingSystem.get` with the assumption
that it would never return `null` anyway.
Fixes gh-24163
Update `ApplicationConversionService` with support for converting
`CharSequence` source types by using existing `String` based converters.
The addition is primarily to allow `ConfigTreePropertySource` values
to be converted correctly.
Closes gh-24171
This commit sets the pull policy to `IF_NOT_PRESENT` where possible
in integration tests for the Maven and Gradle plugins to reduce
the number of times the default Paketo builder and run images are
pulled from Docker Hub.
Fixes gh-24113
Prior to this commit, packaging a Spring Boot application as a container
image with Cloud Native Buildpacks could result in unwanted browser
caching behavior, with "Last-Modified" HTTP response headers pointing to
dates in the far past.
This is due to CNB resetting the last-modified date metadata for static
files (for build reproducibility and container layer caching) and Spring
static resource handling relying on that information when serving static
resources.
This commit introduces a new configuration property
`spring.web.resources.cache.use-last-modified` that can be used to
disable this behavior in Spring if the application is meant to run as a
container image built by CNB.
The default value for this property remains `true` since this remains
the default value in Spring Framework and using that information in
other deployment models is a perfectly valid use case.
Fixes gh-24099
