https://freemarker.apache.org/: FreeMarker is a "template engine"; a generic tool to generate text output based on templates. (Apache Software Foundation) 
abstract class freemarker.core.TemplatePostProcessor
  minor version: 0
  major version: 59
  flags: flags: (0x0420) ACC_SUPER, ACC_ABSTRACT
  this_class: freemarker.core.TemplatePostProcessor
  super_class: java.lang.Object
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // freemarker.core.TemplatePostProcessor this
         0: .line 28
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // freemarker.core.TemplatePostProcessor this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lfreemarker/core/TemplatePostProcessor;

  public abstract void postProcess(freemarker.template.Template);
    descriptor: (Lfreemarker/template/Template;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws freemarker.core.TemplatePostProcessorException
    MethodParameters:
      Name  Flags
      e     
}
SourceFile: "TemplatePostProcessor.java"