Support spring-graalvm-native

[letrungtrung]

Hi dubbo team, Currently, Spring team support graalvm native build, how long Dubbo will support it? https://github.com/spring-projects-experimental/spring-graalvm-native

[mercyblitz]

Good Advice~

[chenzx]

I'm currently trying native-convert a spring-boot + dubbo sample app, & find that dubbo uses curator/javassist to dynamically create *$Adaptive classes for zookeeper client, however, these runtime-created classes seem cannot be recorded by tracing agent, & use GraalVM's @TargetClass & @Substitute to replace some class fiels to fix the code-running logic

but graalvm native-image then still reports wierd "javassist.CannotCompileException: by com.oracle.svm.core.jdk.UnsupportedFeatureError: Unsupported method java.lang.ClassLoader.defineClass(String, byte[], int, int, ProtectionDomain) is reachable error "