Thymeleaf templateResolver WebApplicationContext throw nullpointexception

Question

当我在 SpringMVC 中使用 thymeleaf 时，ServletContext 抛出空点异常，这是我的代码和跟踪堆栈

@配置

公共 class ViewResolverConfig {

@Bean
public ITemplateResolver templateResolver() {
    WebApplicationContext webApplicationContext = ContextLoader.getCurrentWebApplicationContext();
   
    ServletContextTemplateResolver templateResolver = new ServletContextTemplateResolver(webApplicationContext.getServletContext());
    templateResolver.setPrefix("/WEB-INF/templates/");
    templateResolver.setSuffix(".html");
    templateResolver.setCharacterEncoding("UTF-8");
    templateResolver.setTemplateMode(TemplateMode.HTML);
    return templateResolver;
}


@Bean
public SpringTemplateEngine templateEngine(ITemplateResolver templateResolver) {
    SpringTemplateEngine templateEngine = new SpringTemplateEngine();
    templateEngine.setTemplateResolver(templateResolver);
    return templateEngine;
}


@Bean
public ViewResolver viewResolver(SpringTemplateEngine templateEngine) {
    ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
    viewResolver.setCharacterEncoding("UTF-8");
    viewResolver.setTemplateEngine(templateEngine);
    return viewResolver;
}}

这是按钮错误

Caused by: java.lang.NullPointerException: null
at com.lh.config.WebConfig.templateResolver(WebConfig.java:46)
at com.lh.config.WebConfig$$EnhancerBySpringCGLIB$$ede505eb.CGLIB$templateResolver$3(<generated>)
at com.lh.config.WebConfig$$EnhancerBySpringCGLIB$$ede505eb$$FastClassBySpringCGLIB$$6ff8b31b.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331)
at com.lh.config.WebConfig$$EnhancerBySpringCGLIB$$ede505eb.templateResolver(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
... 63 common frames omitted

但我不知道为什么 WebApplicationContext 是 null