@Test
public void executeCustomMybatisMapperQuery() throws Exception {
    AnnotationConfigApplicationContext applicationContext = this.context(Application.class);
    ManagementService managementService = applicationContext.getBean(ManagementService.class);
    String processDefinitionId = managementService.executeCustomSql(new AbstractCustomSqlExecution<CustomMybatisMapper, String>(CustomMybatisMapper.class) {
        @Override
        public String execute(CustomMybatisMapper customMybatisMapper) {
            return customMybatisMapper.loadProcessDefinitionIdByKey("waiter");
        }
    });
    Assert.assertNotNull("the processDefinitionId should not be null!", processDefinitionId);
}