'java.lang.IllegalStateException: A ServletContext is required to access the javax.websocket.server.ServerContainer instance' Error occurs - spring-mvc

Question

I have this error when run junit test in spring mvc project.
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'createWebSocketContainer' defined in net.ebaolife.tpa.websocket.WebSocketConfig: Invocation of init method failed; nested exception is java.lang.IllegalStateException: A ServletContext is required to access the javax.websocket.server.ServerContainer instance
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1583)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:732)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:128)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:108)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:251)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)
... 24 more
Caused by: java.lang.IllegalStateException: A ServletContext is required to access the javax.websocket.server.ServerContainer instance
at org.springframework.util.Assert.state(Assert.java:392)
at org.springframework.web.socket.server.standard.ServletServerContainerFactoryBean.afterPropertiesSet(ServletServerContainerFactoryBean.java:102)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1642)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1579)
... 39 more
I have add below jar. And spring version is 4.3.3.RELEASE
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-websocket</artifactId>
<version>8.0.28</version>
<scope>test</scope>
</dependency>
I found this bug in spring forum https://jira.spring.io/browse/SPR-14367.
But it only provided a workaround in spring boot, and it says it is fixed in spring 4.3.1 .
Test class is :
#RunWith(SpringJUnit4ClassRunner.class)
#ContextConfiguration({ "classpath*:applicationContext*.xml" })
public class Test {
...
}

Answer 1

In test class add annotation #WebAppConfiguration, this error is gone.