Apache Royale and JDK 8 compatibility - spring-boot

Question

I'm trying to create an Apache Royale project with Java back end.
I've used in my pom blazeds-spring-boot-starter but I have a compatibility issue about the JDK compatibility in org.springframework.flex.config.FlexConfigurationManager class in the method getMessagingConfiguration in Spring Flex Core jar.
This issue has derived by use of JdkVersion class not presents in Java 8 (or greater).
How can I fix that?
This is my pom dependencies:
<dependency>
<groupId>org.apache.flex.blazeds</groupId>
<artifactId>blazeds-spring-boot-starter</artifactId>
<version>4.7.3</version>
</dependency>
So, I don't understand how Apache Royale can be used with JDK greater than 7.
This is my stackerror:
java.lang.NoClassDefFoundError: org/springframework/core/JdkVersion
at org.springframework.flex.config.FlexConfigurationManager.getMessagingConfiguration(FlexConfigurationManager.java:101)
~[spring-flex-core-1.5.2.RELEASE.jar:na]
at org.springframework.flex.core.MessageBrokerFactoryBean.afterPropertiesSet(MessageBrokerFactoryBean.java:141)
~[spring-flex-core-1.5.2.RELEASE.jar:na]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1845)
~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1782)
~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:602)
~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:925)
~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
~[spring-context-5.3.5.jar:5.3.5]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
~[spring-context-5.3.5.jar:5.3.5]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144)
~[spring-boot-2.4.4.jar:2.4.4]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:769)
~[spring-boot-2.4.4.jar:2.4.4]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761)
~[spring-boot-2.4.4.jar:2.4.4]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426)
~[spring-boot-2.4.4.jar:2.4.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:326)
~[spring-boot-2.4.4.jar:2.4.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1313)
~[spring-boot-2.4.4.jar:2.4.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1302)
~[spring-boot-2.4.4.jar:2.4.4]
at it.uncertainty.KylixApplication.main(KylixApplication.java:23) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
~[spring-boot-devtools-2.4.4.jar:2.4.4] Caused by:
java.lang.ClassNotFoundException: org.springframework.core.JdkVersion
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606)
~[na:na]
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
~[na:na]
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[na:na]
... 26 common frames omitted