gradle + jetty + Spring MVC 无法启动项目

目前正在看 《 Spring in action 》第四版，想跟着书中第五章开始的实战项目做一下，但在使用 gradle 和 jetty 启动项目时遇到了一些问题。

代码基本抄书上的，贴几个关键的配置文件：

package spittr.config; import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer; import spittr.web.WebConfig; public class SpitterWebInitializer extends AbstractAnnotationConfigDispatcherServletInitializer { @Override protected Class<?>[] getRootConfigClasses() { return new Class<?>[]{RootConfig.class}; } @Override protected Class<?>[] getServletConfigClasses() { return new Class<?>[]{WebConfig.class}; } @Override protected String[] getServletMappings() { return new String[]{"/"}; } } 

这是根配置文件：

package spittr.config; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.ComponentScan.Filter; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.FilterType; import org.springframework.web.servlet.config.annotation.EnableWebMvc; @Configuration @ComponentScan( basePackages = {"spittr"}, excludeFilters = { @Filter(type = FilterType.ANNOTATION, value = EnableWebMvc.class) }) public class RootConfig { } 

注意全部使用基于 java 的配置，没有 xml 文件。

build.gradle 如下：

apply plugin: 'war' apply plugin: 'idea' apply plugin: 'java' apply from: 'gretty.plugin' dependencies { compile "org.springframework:spring-webmvc:4.0.7.RELEASE" compile "javax.servlet:jstl:1.2" // providedCompile "javax.servlet.jsp:jsp-api:2.1" // providedCompile "javax.el:javax.el-api:2.2.4" } sourceCompatibility = 1.8 targetCompatibility = 1.8 repositories { maven{ url 'http://maven.aliyun.com/nexus/content/groups/public/'} maven { url 'http://maven.springframework.org/release' } maven { url 'http://maven.springframework.org/milestone' } maven { url 'http://maven.springframework.org/snapshot' } maven { url 'http://download.java.net/maven/2' } mavenCentral() } war { baseName = 'spittr' version = '0.1.0' } 

当我运行 gradle appRun 命令启动服务器时，得到如下的信息：

YangdeMBP:Spittr yangxg$ ./gradlew appRun WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.codehaus.groovy.reflection.CachedClass (file:/Users/yangxg/.gradle/caches/modules-2/files-2.1/org.codehaus.groovy/groovy/2.4.15/74b7e0b99526c569e3a59cb84dbcc6204d601ee6/groovy-2.4.15.jar) to method java.lang.Object.finalize() WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.reflection.CachedClass WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release 18:17:47 INFO Spring WebApplicationInitializers detected on classpath: [spittr.config.SpitterWebInitializer@760cf594] 18:17:47 INFO Initializing Spring root WebApplicationContext 10 月 08, 2018 6:17:47 下午 org.springframework.web.context.ContextLoader initWebApplicationContext 信息: Root WebApplicationContext: initialization started 10 月 08, 2018 6:17:48 下午 org.springframework.web.context.support.AnnotationConfigWebApplicationContext prepareRefresh 信息: Refreshing Root WebApplicationContext: startup date [Mon Oct 08 18:17:48 CST 2018]; root of context hierarchy 10 月 08, 2018 6:17:48 下午 org.springframework.web.context.support.AnnotationConfigWebApplicationContext loadBeanDefinitions 信息: Registering annotated classes: [class spittr.config.RootConfig] 10 月 08, 2018 6:17:48 下午 org.springframework.web.context.ContextLoader initWebApplicationContext 信息: Root WebApplicationContext: initialization completed in 301 ms 18:17:48 INFO Initializing Spring FrameworkServlet 'dispatcher' 10 月 08, 2018 6:17:48 下午 org.springframework.web.servlet.DispatcherServlet initServletBean 信息: FrameworkServlet 'dispatcher': initialization started 10 月 08, 2018 6:17:48 下午 org.springframework.web.context.support.AnnotationConfigWebApplicationContext prepareRefresh 信息: Refreshing WebApplicationContext for namespace 'dispatcher-servlet': startup date [Mon Oct 08 18:17:48 CST 2018]; parent: Root WebApplicationContext 10 月 08, 2018 6:17:48 下午 org.springframework.web.context.support.AnnotationConfigWebApplicationContext loadBeanDefinitions 信息: Registering annotated classes: [class spittr.web.WebConfig] 10 月 08, 2018 6:17:48 下午 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping registerHandlerMethod 信息: Mapped "{[/],methods=[GET],params=[],headers=[],cOnsumes=[],produces=[],custom=[]}" onto public java.lang.String spittr.web.HomeController.home() 10 月 08, 2018 6:17:48 下午 org.springframework.web.servlet.handler.SimpleUrlHandlerMapping registerHandler 信息: Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler] 10 月 08, 2018 6:17:48 下午 org.springframework.web.servlet.DispatcherServlet initServletBean 信息: FrameworkServlet 'dispatcher': initialization completed in 510 ms 18:17:48 INFO Jetty 9.2.24.v20180105 started and listening on port 8080 18:17:48 INFO Spittr runs at: 18:17:48 INFO http://localhost:8080/Spittr > Task :appRun Press any key to stop the server. <===========--> 87% EXECUTING [35s] > :appRun 

比较奇怪的一个地方是进度指示器卡在 87% 不在动，访问 http://localhost:8080/Spittr 时报错信息如下：

org.apache.jasper.JasperException: /WEB-INF/views/home.jsp(1,63) PWC6188: The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:92) at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:378) at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:172) at org.apache.jasper.compiler.TagLibraryInfoImpl.generateTLDLocation(TagLibraryInfoImpl.java:431) at org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:240) at org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:502) at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:582) at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1657) at org.apache.jasper.compiler.Parser.parse(Parser.java:185) at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:244) at org.apache.jasper.compiler.ParserController.parse(ParserController.java:145) at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:212) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:451) at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:625) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377) at org.eclipse.jetty.jsp.JettyJspServlet.service(JettyJspServlet.java:103) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:595) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:191) at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:72) at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:209) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:267) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1221) at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1005) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:952) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852) at javax.servlet.http.HttpServlet.service(HttpServlet.java:687) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669) at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:201) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.Server.handle(Server.java:499) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:258) at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555) at java.base/java.lang.Thread.run(Thread.java:844) 

但显然 gradle 在 build 项目时已经为我安装了 jstl 1.2，这是为什么呢？