java - Spring REST应用程序配置和启动

Question

我有这个应用程序，以前运行得很好。

我尝试在很长一段时间后运行它，但它的行为不符合预期。

很抱歉出现不太精确的错误问题。

这是一个公开 Controller 的 Spring REST 应用程序，而不是 Spring MVC 应用程序。

让我困惑的第一件事是，在调试器中启动它不会让它在 WebConfiguration 类的方法中放置的所有断点处停止:

package com.nsn.nitro.project.rest.config;

@Configuration
@EnableWebMvc
@EnableSpringDataWebSupport
@ComponentScan(nameGenerator = PackageBeanNameGenerator.class, basePackages = { "com.nsn.nitro.project.rest" })
public class WebConfiguration extends WebMvcConfigurerAdapter {

    private static final int PAGE_DEFAULT_SIZE = 20;

    @Override
    public void addArgumentResolvers(
            List<HandlerMethodArgumentResolver> argumentResolvers) {
        PageableHandlerMethodArgumentResolver resolver = new PageableHandlerMethodArgumentResolver();
        resolver.setFallbackPageable(new PageRequest(0, PAGE_DEFAULT_SIZE));
        resolver.setMaxPageSize(50);
        resolver.setOneIndexedParameters(true);
        resolver.setPageParameterName("page");
        resolver.setSizeParameterName("size");
        argumentResolvers.add(resolver);
        super.addArgumentResolvers(argumentResolvers);
    }

    @Bean
    public MessageSource messageSource() {
        ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
        messageSource.setBasenames("classpath:messages/messages",
                "classpath:messages/validation");
        // If true, the key of the message will be displayed if the key is not
        // found, instead of throwing an exception
        messageSource.setUseCodeAsDefaultMessage(true);
        messageSource.setDefaultEncoding("UTF-8");
        // The value 0 means always reload the messages to be developer friendly
        messageSource.setCacheSeconds(0);
        return messageSource;
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/*").addResourceLocations("/");
    }

    @Override
    public void configureDefaultServletHandling(
            DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    @Bean
    public LocaleResolver localeResolver() {
        return new SmartLocaleResolver();
    }

    @Bean
    public MultipartResolver multipartResolver() {
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
        multipartResolver.setMaxUploadSize(1024000);
        return multipartResolver;
    }

    // The locale interceptor provides a way to switch the language in any page
    // just by passing the lang=’en’, lang=’fr’, and so on to the url
    @Bean
    public LocaleChangeInterceptor localeChangeInterceptor() {
        LocaleChangeInterceptor localeChangeInterceptor = new LocaleChangeInterceptor();
        localeChangeInterceptor.setParamName("lang");
        return localeChangeInterceptor;
    }

    // Avoid caching issue with AngularJS on IE
    @Bean
    public WebContentInterceptor webContentInterceptor() {
        WebContentInterceptor interceptor = new WebContentInterceptor();
        interceptor.setCacheSeconds(0);
        interceptor.setUseExpiresHeader(true);
        interceptor.setUseCacheControlHeader(true);
        interceptor.setUseCacheControlNoStore(true);
        return interceptor;
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(localeChangeInterceptor());
        registry.addInterceptor(webContentInterceptor());
    }

以及应用程序配置:

package com.nsn.nitro.project.rest.config;    

@Configuration
@ComponentScan(nameGenerator = PackageBeanNameGenerator.class, basePackages = {
        "com.nsn.nitro.project.data.config",
        "com.nsn.nitro.project.rest.config",
        "com.nsn.nitro.project.rest.service" })
public class ApplicationConfiguration {

    private static Logger logger = LoggerFactory.getLogger(ApplicationConfiguration.class);

    public ApplicationConfiguration() {
        logger.debug("===========>> Loading the NITRO application configuration");
    }

}

调试器也不会在 ApplicationConfiguration() 构造函数中的断点处停止。我在控制台日志中看不到记录器输出。

应用程序似乎启动正常:

INFO] <<< tomcat7-maven-plugin:2.2:run (default-cli) < process-classes @ nitro-project-rest <<<
[INFO] 
[INFO] --- tomcat7-maven-plugin:2.2:run (default-cli) @ nitro-project-rest ---
[INFO] Running war on http://localhost:8080/nitro-project-rest
[INFO] Creating Tomcat server configuration at /home/stephane/dev/java/projects/nitro-project-rest/target/tomcat
[INFO] create webapp with contextPath: /nitro-project-rest
Dec 31, 2016 9:41:14 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Dec 31, 2016 9:41:14 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8443"]
Dec 31, 2016 9:41:16 AM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Tomcat
Dec 31, 2016 9:41:16 AM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.47
Dec 31, 2016 9:41:25 AM org.apache.catalina.core.ApplicationContext log
INFO: 1 Spring WebApplicationInitializers detected on classpath
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/stephane/.m2/repository/org/slf4j/slf4j-log4j12/1.6.4/slf4j-log4j12-1.6.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/stephane/.m2/repository/ch/qos/logback/logback-classic/1.1.7/logback-classic-1.1.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
Dec 31, 2016 9:41:26 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Dec 31, 2016 9:41:26 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8443"]

我使用 Maven 命令启动应用程序:

mvn clean install tomcat7:run

但是发送任何请求，例如 curl -H "Accept:application/json"--user nsn@nsn.com:******** http://localhost:8080/nitro-project-rest/greeting?message=Steph 总是会给我以下错误:

SEVERE: Servlet.service() for servlet [default] in context with path [/nitro-project-rest] threw exception
java.lang.IllegalStateException: No WebApplicationContext found: no ContextLoaderListener or DispatcherServlet registered?

这是我的问候语 Controller :

@Controller
@RequestMapping(RESTConstants.SLASH + RESTConstants.GREETING + RESTConstants.SLASH)
public class GreetingController {

    private static final String TEMPLATE = "Hello, %s!";

    @RequestMapping(value = RESTConstants.SLASH + RESTConstants.HELLO, method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
    @ResponseBody
    public HttpEntity<Greeting> hello(@RequestParam(value = "message", required = false, defaultValue = "World") String message, UriComponentsBuilder builder) {
        Greeting greeting = new Greeting(String.format(TEMPLATE, message));
        greeting.add(linkTo(methodOn(GreetingController.class).hello(message, builder)).withSelfRel());
        HttpHeaders responseHeaders = new HttpHeaders();
        responseHeaders.setLocation(builder.path(RESTConstants.SLASH + RESTConstants.GREETING + RESTConstants.SLASH + "hello").buildAndExpand().toUri());
        responseHeaders.add("Content-Type", "application/json; charset=utf-8");
        ResponseEntity<Greeting> responseEntity = new ResponseEntity<Greeting>(greeting, responseHeaders, HttpStatus.OK);        
        return responseEntity;
    }

}

Answer 1

我缺少调度程序 servlet!

现在有了这个文件，效果好多了:

public class WebInit extends AbstractAnnotationConfigDispatcherServletInitializer {

    private static Logger logger = LoggerFactory.getLogger(WebInit.class);

    @Override
    protected void customizeRegistration(ServletRegistration.Dynamic registration) {
        registration.setInitParameter("dispatchOptionsRequest", "true");
        registration.setAsyncSupported(true);
        registration.setLoadOnStartup(1);
    }

    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class<?>[] { ApplicationConfiguration.class };
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class<?>[] { WebConfiguration.class };
    }

    @Override
    protected String[] getServletMappings() {
        // The '/api/*' prefix is to allow a match of an .../api/... request to a controller mapping
        // The '/' is to allow a match of a root request to a static resource
        return new String[] { "/api/*", "/" };
    }

    @Override
    protected String getServletName() {
        return CommonConstants.SERVLET_NAME;
    }

}