code: package com.puppycrawl.tools.checkstyle.api.fullident;
  
  import java.lang.reflect.InvocationTargetException;
  import java.util.List;
  
  import javax.annotation.Nullable;
  
  import org.junit.Assert;
  
  import com.google.common.reflect.Invokable;
  
  public class InputFullIdentReturnNoAnnotation {
      private static <T> @Nullable T invoke(Invokable<?, ? extends T> factory, List<?> args)
                  throws InvocationTargetException, IllegalAccessException {
              T returnValue = factory.invoke(null, args.toArray());
              if (returnValue == null) {
                  Assert.assertTrue(
                          Boolean.parseBoolean(factory
                                  + " returns null but it's not annotated with @Nullable"));
              }
              return returnValue;
          }
  }
  