ApplicationContext Resource leak: 'ctx' is never closed

ApplicationContext ctx声明为成员变量

public class UserServiceTest {
     
    private static UserService us;
    private static ApplicationContext ctx;
 
    @BeforeClass
    public static void setUpBeforeClass() throws Exception {
         ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
         us=(UserService) ctx.getBean("userService");
    }
 
    @Test
    public void testSave() {
         
    }
｝