【发布时间】:2021-06-03 22:47:50
【问题描述】:
Context 作为 null 传递,因此在 context.getBean("abcRestTemplate", RestTemplate.class) 中得到 NullPointerException。上下文为空可能是什么问题。
AuthnConfig.java
@Getter
@ConfigurationProperties(prefix = "authn")
@Configuration
public class AuthnConfig {
@Value("${endpoint}")
private String endpoint;
@Value("${client-svc.name}")
private String serviceClientId;
}
RestTemplateConfig.java
@Configuration
public class RestTemplateConfig {
private final AuthnConfig authnConfig;
@Autowired
public RestTemplateConfig(final AuthnConfig authnConfig) {
this.authnConfig = authnConfig;
}
@Bean(name = "abcRestTemplate"){
public RestTemplate abcRestTemplate() {
//authConfig.getEndpoint() etc....
}
}
}
RestTemplateConfigTest.java
@RunWith(SpringRunner.class)
@SpringBootTest
@ActiveProfiles("test")
public class RestTemplateConfigTest {
@Autowired
private RestTemplateConfig restTemplateConfig;
@Autowired
private ApplicationContext context;
@Mock
private AuthnConfig authnConfig;
@Before
public void initializeConfig() {
Mockito.when(authnConfig.getEndpoint()).thenReturn("https://localhost");
}
@Test
public void testForBeanCreation() {
RestTemplate abcRestTemplate = context.getBean("abcRestTemplate", RestTemplate.class);
assertNotNull(abcRestTemplate);
}
}
如果在 RestTemplateConfigTest.class 中使用 @RunWith(MockitoJUnitRunner.class) 会出错:
java.lang.NullPointerException, context is getting passed as NULL in context.getBean("abcRestTemplate", RestTemplate.class);
如果在 RestTemplateConfigTest.class 中使用 @RunWith(SpringRunner.class) 会出错
[ERROR] testForBeanCreation Time elapsed: 0.028 s <<< ERROR!
java.lang.IllegalStateException: Failed to load ApplicationContext
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'authnConfig': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'endpoint' in value "${endpoint}"
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'endpoint' in value "${endpoint}"
【问题讨论】:
-
这行不通。
@Before方法在上下文初始化后调用,因此 bean 已经创建,此时值为null。您可以尝试@MockBean,这样实际的 bean 会被替换,但@Before仍然执行得太晚而无法产生影响。 -
这里我正在检查是否创建了bean,我还需要添加@MockBean吗?
标签: java spring-boot maven unit-testing configurationproperties