How to initialize SystemUsage of ActiveMQ with spring-boot?

I'm trying to initialize embedded activemq JMS using spring-boot. It works in general, but I want to also lower the memory usage. Therefore I'm trying to provide the SystemUsage as a bean.

But the SystemUsage bean is not taken into account and the activemq embedded has still the default configuration of 1GB . What might be wrong?

@EnableAutoConfiguration
@EnableJms
public class AppConfig {
    @Bean
    public SystemUsage systemUsage() {
        MemoryPropertyEditor editor = new MemoryPropertyEditor();
        SystemUsage system = new SystemUsage();

        MemoryUsage memory = new MemoryUsage();
        editor.setAsText("20mb");
        memory.setLimit((long) editor.getValue());
        system.setMemoryUsage(memory);

        return system;
    }
}