code: public static String fromBytes(byte[] bytes) {
      EnsureUtil.ensureActiveCommandContext("StringUtil.fromBytes");
      ProcessEngineConfigurationImpl processEngineConfiguration = Context.getProcessEngineConfiguration();
      return fromBytes(bytes, processEngineConfiguration.getProcessEngine());
    }
docs: converts a byte array into a string using the current process engines default charset as
  returned by {@link ProcessEngineConfigurationImpl#getDefaultCharset()}
  
  @param bytes the byte array
  @return a string representing the bytes