ClassNotFoundException during AOT processing of Logback XML that references a variable when defining a component's class

[justin-tay]

Performing AOT processing of a logback configuration xml with variables as the class name throws a java.lang.ClassNotFoundException in org.springframework.boot.logging.logback.SpringBootJoranConfigurator.

I have created a reproducer at https://github.com/justin-tay/spring-boot-logback-issue which demonstrates the issue.

Running mvnw spring-boot:run shows that it runs normally and logback substitutes the variable for the class name.

Running mvnw spring-boot:process-aot shows the exception.

In logback the relevant code performing the substitution is

https://github.com/qos-ch/logback/blob/bba7a908c87a4a483860f6d49695ec2348c56e49/logback-core/src/main/java/ch/qos/logback/core/model/processor/ImplicitModelHandler.java#L126

I think that in Spring Boot the following should also likewise add code to perform the substitution

spring-boot/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/SpringBootJoranConfigurator.java

Line 260 in 7d69731

return loadComponentType(this.modelInterpretationContext.getImport(className));