code: @Validate
      public void start() {
          Boolean enabled = configuration.getBooleanWithDefault("ehcache.enabled", true);
          if (!enabled) {
              return;
          }
  
          File config = new File(configuration.getBaseDir(), CUSTOM_CONFIGURATION);
          final ClassLoader original = Thread.currentThread().getContextClassLoader();
          try {
              Thread.currentThread().setContextClassLoader(this.getClass().getClassLoader());
              if (config.isFile()) {
                  manager = CacheManager.create(config.getAbsolutePath());
              } else {
                  URL url = EhCacheService.class.getClassLoader().getResource(INTERNAL_CONFIGURATION);
                  if (url != null) {
                      manager = CacheManager.create(url);
                  } else {
                      throw new ExceptionInInitializerError("Cannot instantiate EhCache, " +
                              "cannot load " + INTERNAL_CONFIGURATION + " file");
                  }
              }
              manager.addCache(WISDOM_KEY);
              cache = manager.getCache(WISDOM_KEY);
  
              registration = context.registerService(Cache.class, this, new Hashtable<String, Object>());
          } finally {
              Thread.currentThread().setContextClassLoader(original);
          }
  
  
      }
docs: Creates the EhCache-based implementation of the Cache Service.