https://freemarker.apache.org/: FreeMarker is a "template engine"; a generic tool to generate text output based on templates. (Apache Software Foundation) 
interface freemarker.template.SerializableTemplateBooleanModel extends freemarker.template.TemplateBooleanModel, java.io.Serializable
  minor version: 0
  major version: 59
  flags: flags: (0x0600) ACC_INTERFACE, ACC_ABSTRACT
  this_class: freemarker.template.SerializableTemplateBooleanModel
  super_class: java.lang.Object
{
}
SourceFile: "SerializableTemplateBooleanModel.java"