fix: Restore Backward Compatibility with Spring Boot Reconfiguration #3773
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Add test verifying expected behavior of `LoggerContext.start(Configuration)` to ensure backward compatibility: - The configuration must always be replaced, even if the context has already started. - Only the first configuration should register the shutdown hook.
Although Spring Boot never directly starts a `LoggerContext`, its logging system — including our `Log4j2SpringBootLoggingSystem` and equivalents in Spring Boot 2.x and 3.x — has consistently used `LoggerContext.start(Configuration)` for reconfiguration. To maintain backward compatibility with these usages, `start(Configuration)` now falls back to `reconfigure(Configuration)` if the context is already started. Closes #3770
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Although Spring Boot never directly starts a
LoggerContext, its logging system — including ourLog4j2SpringBootLoggingSystemand equivalents in Spring Boot 2.x and 3.x — has consistently usedLoggerContext.start(Configuration)for reconfiguration.To maintain backward compatibility with these usages,
start(Configuration)now falls back toreconfigure(Configuration)if the context is already started.Closes #3770