[GitHub] [skywalking] WickeyLiang opened a new issue #4563: application with agent startup and report illegal field modifiers in class

[GitBox]

WickeyLiang opened a new issue #4563: application with agent startup and report 
illegal field modifiers in class
URL: https://github.com/apache/skywalking/issues/4563
 
 
   jdk: 1.7
   skywalking: 6.6
   spring: 4.0.4
   Other same versions projects with agent are startup normally except this，the 
error in agent log:
   
![image](https://user-images.githubusercontent.com/11452144/77383930-20852800-6dbf-11ea-96ec-0ceb342e665d.png)
   
   my code 
   `public interface TaskCallback<T> extends ListenableFutureCallback<T> {
   
       public void onTimeout();
   }`
   
   `public interface ListenableTask<T> extends Callable<T>, TaskCallback<T> {
   
   }`
   
   

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