在activiti 7.x版本中，getFormService()方法的替代方法是使用ProcessEngineConfiguration类的getFormEngineRepositoryService()方法，getIdentityService()方法的替代方法是使用ProcessEngineConfiguration类的getIdentityManager()方法。

以下是使用代码示例的解决方法：

1. 替代getFormService()方法：

import org.activiti.engine.ProcessEngineConfiguration;
import org.activiti.engine.FormEngineRepositoryService;

ProcessEngineConfiguration processEngineConfiguration = ProcessEngineConfiguration.createStandaloneProcessEngineConfiguration();
FormEngineRepositoryService formEngineRepositoryService = processEngineConfiguration.getFormEngineRepositoryService();

2. 替代getIdentityService()方法：

import org.activiti.engine.ProcessEngineConfiguration;
import org.activiti.engine.IdentityManager;

ProcessEngineConfiguration processEngineConfiguration = ProcessEngineConfiguration.createStandaloneProcessEngineConfiguration();
IdentityManager identityManager = processEngineConfiguration.getIdentityManager();