https://eclipse.org/jetty/jetty-util: Utility classes for Jetty (Webtide) 
public interface org.eclipse.jetty.util.ClassVisibilityChecker
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.eclipse.jetty.util.ClassVisibilityChecker
  super_class: java.lang.Object
{
  public abstract boolean isSystemClass(java.lang.Class<?>);
    descriptor: (Ljava/lang/Class;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Ljava/lang/Class<*>;)Z
    MethodParameters:
       Name  Flags
      clazz  

  public abstract boolean isServerClass(java.lang.Class<?>);
    descriptor: (Ljava/lang/Class;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Ljava/lang/Class<*>;)Z
    MethodParameters:
       Name  Flags
      clazz  
}
SourceFile: "ClassVisibilityChecker.java"