https://freemarker.apache.org/: FreeMarker is a "template engine"; a generic tool to generate text output based on templates. (Apache Software Foundation) 
public interface freemarker.cache.ConcurrentCacheStorage extends freemarker.cache.CacheStorage
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: freemarker.cache.ConcurrentCacheStorage
  super_class: java.lang.Object
{
  public abstract boolean isConcurrent();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "ConcurrentCacheStorage.java"