英文:
Why is Spring @Autowired ApplicationContext null in integration test?
问题
我对Spring还不太熟悉，已经查看了Stack Overflow上类似的问题，但无法从中找到答案。当我调用我的applicationContext变量时，我收到了一个NPE，这意味着Bean可能没有正确创建或注入。这是我的程序的相关部分：
@SpringBootTest
@ContextConfiguration(classes = TestConfig.class)
public class SampleIT {
@Autowired
private ApplicationContext applicationContext;
@Test
public void sampleMethod() throws Exception {
//下面会出现NPE
String[] allBeanNames = applicationContext.getBeanDefinitionNames();
//更多逻辑
}
}
我尝试获取ApplicationContext实例以调试为什么来自我的配置的其他Bean为空，所以这一切肯定是因为我对ApplicationContext设置以及从中注入Bean的理解存在基本缺陷。非常感谢任何帮助！
英文:
I'm still new to Spring and have looked at similar questions on stack but couldn't identify an answer from what I've read.
I'm receiving an NPE when I call my applicationContext variable, which means the bean must not have been created or injected correctly. Here is the relevant portion of my program.
@SpringBootTest
@ContextConfiguration(classes = TestConfig.class)
public class SampleIT {
@Autowired
private ApplicationContext applicationContext;
@Test
public void sampleMethod() throws Exception {
//NPE below
String[] allBeanNames = applicationContext.getBeanDefinitionNames();
//more logic
I'm trying to get the ApplicationContext instance to debug why other beans are null from my config, so this all must be because of a basic flaw in my understanding of how ApplicationContext is setup and beans from it are injected. Any help is very much appreciated!
答案1
得分: 8
尝试将以下注解添加到您的类 SampleIT 中：
@RunWith(SpringRunner.class)
英文:
Try to add the following annotation to your class SampleIT:
@RunWith(SpringRunner.class)
答案2
得分: 1
导入org.junit.jupiter.api.Test而不是org.junit.Test将导致使用Junit5。这将允许Junit与Spring一起工作，无需@RunWith(SpringRunner.class)注解。在我正在处理的代码库中仍然存在Junit4的痕迹，因此这是在完全迁移到Junit 5之前的一个快速修复。
英文:
Answering my own question now. Importing org.junit.jupiter.api.Test instead of org.junit.Test will cause Junit5 to be used. This will allow Junit to work with Spring without the @RunWith(SpringRunner.class) annotation. There are still remnants of Junit4 left in the codebase I'm working in, so this is a quick fix before completely moving to Junit 5.
答案3
得分: 1
如果您正在使用 Junit 4 版本，您需要使用 @RunWith(SpringRunner.class)，
如果您正在使用 Junit 5 版本，您需要使用 @ExtendWith(SpringExtension.class)。
另外，如果您正在使用 Mockito，您可以使用 @ExtendWith(MockitoExtension.class) 等。
我强烈建议阅读有关 @SpringBootTest 注解的文档，链接如下：
@SpringBootTest
英文:
If you are using Junit in version 4, You have to use @RunWith(SpringRunner.class),
If you are using Junit version 5, You have to use @ExtendWith(SpringExtension.class).
Additionally if you are using Mockito You can use @ExtendWith(MockitoExtension.class) etc.
I highly recommend read documentation about @SpringBootTest annotation in this link
@SpringBootTest
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