我是Spring的新手,基本配置我已经遇到了一个非常奇怪的问题。
引起:java.lang.IllegalStateException:无法初始化上下文,因为已存在根应用程序上下文 - 检查web.xml中是否有多个ContextLoader *定义! 在org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:297) 在org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) at io.undertow.servlet.core.ApplicationListeners.contextInitialized(ApplicationListeners.java:173) 在io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:194) ......还有7个
我需要两个不同的REST servlet:一个用于内部调用(查看服务器),另一个用于外部api。我还希望两个servlet共享一些服务,所以我使用SpringRootConfiguration来扫描包含两个拦截器和一个服务的包。
所有配置都是用Java完成的,只包含web.xml中的上下文和监听器
的web.xml
<context-param>
<param-name>contextClass</param-name>
<param-value>
org.springframework.web.context.support.AnnotationConfigWebApplicationContext
</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
SpringRestExternalAppInitializer
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class[]{SpringRootConfiguration.class};
}
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class[]{SpringRestExternalConfiguration.class};
}
@Override
protected String[] getServletMappings() {
return new String[]{"/api/*"};
}
@Override
protected String getServletName() {
return "restexternal";
}
SpringRootConfiguration
@ComponentScan({"be.xperthis.common"})
@Configuration
public class SpringRootConfiguration {
}
SpringRestExternalConfiguration
@ComponentScan("com.polymedis.result.web.api")
@Configuration
public class SpringRestExternalConfiguration extends WebMvcConfigurationSupport {
@Autowired
private NoCacheHandler noCacheHandler;
@Autowired
private RestMetricHandler restMetrics;
@Override
public void addInterceptors(final InterceptorRegistry registry) {
registry.addInterceptor(noCacheHandler);
registry.addInterceptor(restMetrics);
}
@Override
public void configureDefaultServletHandling(final DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
@Override
public void configureMessageConverters(final List<HttpMessageConverter<?>> converters) {
....
}
@Override
public RequestMappingHandlerMapping createRequestMappingHandlerMapping() {
return new ApiVersionRequestMappingHandlerMapping(); //used to check a custom annotation on every RestController methods
}
}
理论上,应该有第二个Rest配置(内部),但是我在尝试理解异常的同时将其删除了......
注意:在Spring安全教程之后,我将SpringSecurityConfiguration放入getRootConfigClasses(){...}
时遇到了同样的错误我应该从web.xml中删除/添加内容吗? 我使用Wildfly 8并且我已经必须找到Wildfly中的一个错误的解决方法:如果未在WEB-Inf / lib文件夹中添加spring库(jar),则不会拾取Spring配置... < / p>
答案 0 :(得分:0)
好的,我找到了解决方案。我没有覆盖两次AbstractAnnotationConfigDispatcherServletInitializer,而是使用一个实现WebApplicationInitializer的类,我在这个类中构建了两个servlet。
public class SpringAppInitializer implements WebApplicationInitializer {
@Override
public void onStartup(final ServletContext servletContext) throws ServletException {
final AnnotationConfigWebApplicationContext rootContext = new AnnotationConfigWebApplicationContext();
rootContext.register(SpringRootConfiguration.class, SpringSecurityConfig.class);
servletContext.addListener(new ContextLoaderListener(rootContext));
// Internal REST
buildInternalRestContext(servletContext, rootContext);
// External REST
buildExternalRestContext(servletContext, rootContext);
...
}
public void buildExternalRestContext(final ServletContext servletContext, final AnnotationConfigWebApplicationContext rootContext) {
final AnnotationConfigWebApplicationContext externalRestContext = new AnnotationConfigWebApplicationContext();
externalRestContext.setParent(rootContext);
externalRestContext.register(SpringRestExternalConfiguration.class);
final ServletRegistration.Dynamic externalRestServlet = servletContext.addServlet("externalrest", new DispatcherServlet(externalRestContext));
externalRestServlet.addMapping("/api/*");
}
public void buildInternalRestContext(final ServletContext servletContext, final AnnotationConfigWebApplicationContext rootContext) {
final AnnotationConfigWebApplicationContext internalRestContext = new AnnotationConfigWebApplicationContext();
internalRestContext.setParent(rootContext);
internalRestContext.register(SpringRestConfiguration.class);
final ServletRegistration.Dynamic restDispatcherServlet = servletContext.addServlet("rest", new DispatcherServlet(internalRestContext));
restDispatcherServlet.addMapping("/rest/*");
}
}
我现在将继续设置SpringSecurity,但这是另一个主题:)