为什么Jibx为受保护的最终属性抛出java.lang.IllegalAccessError：null？

Question

我正在研究jibx以将xml文件转换为java对象，一切正常，直到遇到IllegalAccessError异常。我花了很多时间，最后我发现它是由适当的最终财产引起的。一个简单的演示如下所示：

//xml 
<type name="test"></type>

//binding
<binding>
   <mapping name="type" class="demo.MyType" value-style="attribute">
      <value name="name" field="name" usage="required" />
   </mapping>
</binding>

//java class
public class MyType{
   // only protected final will cause the error, private final works well.
   protected final name;
   public MyType(){
      name = "demo";
   }
}

// convert method
IBindingFactory bindingFactory = BindingDirectory.getFactory(MyType.class);
        IUnmarshallingContext uctx = 
bindingFactory.createUnmarshallingContext();
        Manifest manifest = (Manifest) uctx.unmarshalDocument(new 
FileInputStream("demo.xml"), null);

我知道上面的演示中受保护的final属性是没有意义的，但是在我的实际情况下，代码是由其他人编写的，并且受保护的final属性在超类中。

我只想知道为什么jibx仅对受保护的最终属性抛出IllegalAccessError？

详细错误堆栈如下所示（我的环境中的错误，而不是上述演示的错误）：

java.lang.IllegalAccessError: null
    at self.jason.study.cartridge.api.JiBX_cartridge_demoMungeAdapter.JiBX_cartridge_demo_unmarshalAttr_1_0() ~[classes/:na]
    at self.jason.study.cartridge.api.JiBX_cartridge_demoManifest_access13.unmarshal() ~[classes/:na]
    at org.jibx.runtime.impl.UnmarshallingContext.unmarshalElement(UnmarshallingContext.java:2757) ~[jibx-run-1.3.1.jar:na]
    at org.jibx.runtime.impl.UnmarshallingContext.unmarshalDocument(UnmarshallingContext.java:2900) ~[jibx-run-1.3.1.jar:na]
    at self.jason.study.cartridge.CartridgeApplication.lambda$0(CartridgeApplication.java:24) [classes/:na]
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:797) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:781) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:335) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at self.jason.study.cartridge.CartridgeApplication.main(CartridgeApplication.java:31) [classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_73]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_73]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_73]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_73]
    at org.springframework.boot.maven.AbstractRunMojo$LaunchRunner.run(AbstractRunMojo.java:496) [spring-boot-maven-plugin-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at java.lang.Thread.run(Unknown Source) [na:1.8.0_73]

[WARNING]
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke (Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke (Unknown Source)
at java.lang.reflect.Method.invoke (Unknown Source)
at org.springframework.boot.maven.AbstractRunMojo$LaunchRunner.run (AbstractRunMojo.java:496)
at java.lang.Thread.run (Unknown Source)
Caused by: java.lang.IllegalAccessError
at self.jason.study.cartridge.api.JiBX_cartridge_demoMungeAdapter.JiBX_cartridge_demo_unmarshalAttr_1_0 ()
at self.jason.study.cartridge.api.JiBX_cartridge_demoManifest_access13.unmarshal ()
at org.jibx.runtime.impl.UnmarshallingContext.unmarshalElement (UnmarshallingContext.java:2757)
at org.jibx.runtime.impl.UnmarshallingContext.unmarshalDocument (UnmarshallingContext.java:2900)
at self.jason.study.cartridge.CartridgeApplication.lambda$0 (CartridgeApplication.java:24)
at org.springframework.boot.SpringApplication.callRunner (SpringApplication.java:797)
at org.springframework.boot.SpringApplication.callRunners (SpringApplication.java:781)
at org.springframework.boot.SpringApplication.run (SpringApplication.java:335)
at org.springframework.boot.SpringApplication.run (SpringApplication.java:1255)
at org.springframework.boot.SpringApplication.run (SpringApplication.java:1243)
at self.jason.study.cartridge.CartridgeApplication.main (CartridgeApplication.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke (Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke (Unknown Source)
at java.lang.reflect.Method.invoke (Unknown Source)
at org.springframework.boot.maven.AbstractRunMojo$LaunchRunner.run (AbstractRunMojo.java:496)
at java.lang.Thread.run (Unknown Source)