近日心血来潮想做一个开源项目，目标是做一款可以适配多端、功能完备的模板工程，包含后台管理系统和前台系统，开发者基于此项目进行裁剪和扩展来完成自己的功能开发。
本项目为前后端分离开发，后端基于Java21和SpringBoot3开发，前端提供了vue、angular、react、uniapp、微信小程序等多种脚手架工程。
但在使用过程中遇到了一些问题，于是在此记录下来与诸位分享。
项目中使用到了Spring WebSocket，主要用于后端向前端推送消息刷新角标，在IDE中直接运行项目的main方法可正常运行，但执行mvn package打包命令时遇到了jakarta.websocket.server.ServerContainer not available错误，而且执行mvn test也会报该错误。
java.lang.IllegalStateException: Failed to load ApplicationContext for [WebMergedContextConfiguration@61b83fef testClass = ……
...
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serverEndpointExporter' defined in class path resource [com/xxx/config/WebSocketConfig.class]: jakarta.websocket.server.ServerContainer not available
...
Caused by: java.lang.IllegalStateException: jakarta.websocket.server.ServerContainer not available
以下是详细错误堆栈。
2024-01-13T09:20:12.781+08:00 ERROR 3352 --- [ main] o.s.test.context.TestContextManager : Caught exception while allowing TestExecutionListener [org.springframework.test.context.web.ServletTestExecutionListener] to prepare test instance [com.xxx.AdminApplicationTests@229f3c5d]
java.lang.IllegalStateException: Failed to load ApplicationContext for [WebMergedContextConfiguration@61b83fef testClass = com.xxx.AdminApplicationTests, locations = [], classes = [com.xxx.AdminApplication], contextInitializerClasses = [], activeProfiles = [], propertySourceDescriptors = [], propertySourceProperties = ["org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true"], contextCustomizers = [org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@b86de0d, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@4808bc9b, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@6f8e8894, org.springframework.boot.test.autoconfigure.actuate.observability.ObservabilityContextCustomizerFactory$DisableObservabilityContextCustomizer@1f, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizer@42e25b0b, org.springframework.boot.test.context.SpringBootTestAnnotation@f07ba1a3], resourceBasePath = "src/main/webapp", contextLoader = org.springframework.boot.test.context.SpringBootContextLoader, parent = null]
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:180) ~[spring-test-6.1.1.jar:6.1.1]
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:130) ~[spring-test-6.1.1.jar:6.1.1]
at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:191) ~[spring-test-6.1.1.jar:6.1.1]
at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:130) ~[spring-test-6.1.1.jar:6.1.1]
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:247) ~[spring-test-6.1.1.jar:6.1.1]
at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:163) ~[spring-test-6.1.1.jar:6.1.1]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$10(ClassBasedTestDescriptor.java:378) ~[junit-jupiter-engine-5.10.1.jar:5.10.1]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.executeAndMaskThrowable(ClassBasedTestDescriptor.java:383) ~[junit-jupiter-engine-5.10.1.jar:5.10.1]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$11(ClassBasedTestDescriptor.java:378) ~[junit-jupiter-engine-5.10.1.jar:5.10.1]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serverEndpointExporter' defined in class path resource [com/xxx/common/config/WebSocketConfig.class]: jakarta.websocket.server.ServerContainer not available
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1775) ~[spring-beans-6.1.1.jar:6.1.1]
... 73 common frames omitted
Caused by: java.lang.IllegalStateException: jakarta.websocket.server.ServerContainer not available
at org.springframework.util.Assert.state(Assert.java:76) ~[spring-core-6.1.1.jar:6.1.1]
at org.springframework.web.socket.server.standard.ServerEndpointExporter.afterPropertiesSet(ServerEndpointExporter.java:107) ~[spring-websocket-6.1.1.jar:6.1.1]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1822) ~[spring-beans-6.1.1.jar:6.1.1]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1771) ~[spring-beans-6.1.1.jar:6.1.1]
... 94 common frames omitted
[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 5.751 s <<< FAILURE! - in com.xxx.AdminApplicationTests
[ERROR] com.xxx.AdminApplicationTests.contextLoads Time elapsed: 0.01 s <<< ERROR!
java.lang.IllegalStateException: Failed to load ApplicationContext for [WebMergedContextConfiguration@61b83fef testClass = com.xxx.AdminApplicationTests, locations = [], classes = [com.xxx.AdminApplication], contextInitializerClasses = [], activeProfiles = [], propertySourceDescriptors = [], propertySourceProperties = ["org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true"], contextCustomizers = [org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@b86de0d, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@4808bc9b, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@6f8e8894, org.springframework.boot.test.autoconfigure.actuate.observability.ObservabilityContextCustomizerFactory$DisableObservabilityContextCustomizer@1f, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizer@42e25b0b, org.springframework.boot.test.context.SpringBootTestAnnotation@f07ba1a3], resourceBasePath = "src/main/webapp", contextLoader = org.springframework.boot.test.context.SpringBootContextLoader, parent = null]
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:180)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serverEndpointExporter' defined in class path resource [com/xxx/common/config/WebSocketConfig.class]: jakarta.websocket.server.ServerContainer not available
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1775)
... 17 more
Caused by: java.lang.IllegalStateException: jakarta.websocket.server.ServerContainer not available
at org.springframework.util.Assert.state(Assert.java:76)
at org.springframework.web.socket.server.standard.ServerEndpointExporter.afterPropertiesSet(ServerEndpointExporter.java:107)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1822)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1771)
... 38 more
[INFO]
[INFO] Results:
[INFO]
[ERROR] Errors:
[ERROR] AdminApplicationTests.contextLoads ? IllegalState Failed to load ApplicationContext for [WebMergedContextConfiguration@61b83fef testClass = com.xxx.AdminApplicationTests, locations = [], classes = [com.xxx.AdminApplication], contextInitializerClasses = [], activeProfiles = [], propertySourceDescriptors = [], propertySourceProperties = ["org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true"], contextCustomizers = [org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@b86de0d, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@4808bc9b, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@6f8e8894, org.springframework.boot.test.autoconfigure.actuate.observability.ObservabilityContextCustomizerFactory$DisableObservabilityContextCustomizer@1f, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizer@42e25b0b, org.springframework.boot.test.context.SpringBootTestAnnotation@f07ba1a3], resourceBasePath = "src/main/webapp", contextLoader = org.springframework.boot.test.context.SpringBootContextLoader, parent = null]
[INFO]
[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0
[INFO]
报错的方法是：
@Configuration
@EnableWebSocket
public class WebSocketConfig {
/**
* 注入ServerEndpointExporter，
* 这个bean会自动注册使用了@ServerEndpoint注解声明的Websocket endpoint
*/
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
报错的方法的主要作用是: 用于扫描带有 @ServerEndpoint 的注解成为 websocket，该方法是服务器端点出口，当进行 SpringBoot 单元测试时，并没有启动服务器，所以当加载到这个bean时会报错。
在@SpringBootTest注解中添加webEnvironment配置，给wevsocket提供测试环境。
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
class AdminApplicationTests {
@Test
void contextLoads() {
}
}