Tai nạn ngẫu nhiên mùa xuân MVC thymeleaf

Question

Tôi gặp vấn đề với Spring MVC và thymeleaf. Khi tôi chạy ứng dụng web của mình, thỉnh thoảng tôi gặp sự cố ngẫu nhiên. Đôi khi tất cả làm việc tốt nhưng đôi khi tôi nhận được một cái gì đó như thế:

javax.servlet.ServletException: Servlet.init() for servlet dispatcher threw exception 
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) 
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) 
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537) 
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085) 
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658) 
    org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277) 
    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2407) 
    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2396) 
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    java.lang.Thread.run(Thread.java:745) 
root cause 

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'viewResolver' defined in com.myapp.configuration.WebConfiguration: Unsatisfied dependency expressed through constructor argument with index 0 of type [org.thymeleaf.spring4.SpringTemplateEngine]: : No qualifying bean of type [org.thymeleaf.spring4.SpringTemplateEngine] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.thymeleaf.spring4.SpringTemplateEngine] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {} 
    org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749) 
    org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:464) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1111) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1006) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) 
    org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) 
    org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 
    org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) 
    org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) 
    org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:762) 
    org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757) 
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480) 
    org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:663) 
    org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:535) 
    org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:489) 
    org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) 
    javax.servlet.GenericServlet.init(GenericServlet.java:158) 
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) 
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) 
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537) 
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085) 
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658) 
    org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277) 
    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2407) 
    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2396) 
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    java.lang.Thread.run(Thread.java:745) 
root cause 

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.thymeleaf.spring4.SpringTemplateEngine] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {} 
    org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1308) 
    org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1054) 
    org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:949) 
    org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:813) 
    org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) 
    org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:464) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1111) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1006) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) 
    org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) 
    org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 
    org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) 
    org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) 
    org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:762) 
    org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757) 
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480) 
    org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:663) 
    org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:535) 
    org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:489) 
    org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) 
    javax.servlet.GenericServlet.init(GenericServlet.java:158) 
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) 
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) 
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537) 
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085) 
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658) 
    org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277) 
    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2407) 
    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2396) 
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    java.lang.Thread.run(Thread.java:745) 

Nó nói với tôi rằng tôi không có đậu SpringTemplateEngine nhưng tôi có nó trong cấu hình của tôi:

... 
imports 
... 
@Configuration 
@EnableWebMvc 
@ComponentScan("com.myapp.controllers") 
public class WebConfiguration extends WebMvcConfigurerAdapter { 

    private static final String TEMPLATE_RESOLVER_PREFIX = "/WEB-INF/templates/"; 
    private static final String TEMPLATE_RESOLVER_SUFFIX = ".html"; 
    private static final String TEMPLATE_RESOLVER_TEMPLATE_MODE = "HTML5"; 

    @Bean 
    public ViewResolver viewResolver(SpringTemplateEngine templateEngine) { 
     ThymeleafViewResolver viewResolver = new ThymeleafViewResolver(); 
     viewResolver.setTemplateEngine(templateEngine); 

     return viewResolver; 
    } 

    @Bean 
    public TemplateEngine templateEngine(TemplateResolver templateResolver) { 
     SpringTemplateEngine templateEngine = new SpringTemplateEngine(); 
     templateEngine.setTemplateResolver(templateResolver); 

     return templateEngine; 
    } 

    @Bean 
    public TemplateResolver templateResolver() { 
     TemplateResolver templateResolver = new ServletContextTemplateResolver(); 
     templateResolver.setPrefix(TEMPLATE_RESOLVER_PREFIX); 
     templateResolver.setSuffix(TEMPLATE_RESOLVER_SUFFIX); 
     templateResolver.setTemplateMode(TEMPLATE_RESOLVER_TEMPLATE_MODE); 

     return templateResolver; 
    } 

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

Tôi cũng có thymeleaf trong tôi .pom:

<?xml version="1.0" encoding="UTF-8"?> 
<project xmlns="http://maven.apache.org/POM/4.0.0" 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 
    <modelVersion>4.0.0</modelVersion> 

    <groupId>groupId</groupId> 
    <artifactId>MyApp</artifactId> 
    <version>1.0-SNAPSHOT</version> 
    <packaging>war</packaging> 
    <name>MyApp</name> 

    <dependencies> 
     <!-- Spring --> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-context</artifactId> 
      <version>4.1.4.RELEASE</version> 
     </dependency> 

     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-webmvc</artifactId> 
      <version>4.1.4.RELEASE</version> 
     </dependency> 

     <!-- Spring Security --> 
     <dependency> 
      <groupId>org.springframework.security</groupId> 
      <artifactId>spring-security-core</artifactId> 
      <version>4.0.0.RELEASE</version> 
     </dependency> 

     <dependency> 
      <groupId>org.springframework.security</groupId> 
      <artifactId>spring-security-web</artifactId> 
      <version>4.0.0.RELEASE</version> 
     </dependency> 

     <dependency> 
      <groupId>org.springframework.security</groupId> 
      <artifactId>spring-security-config</artifactId> 
      <version>4.0.0.RELEASE</version> 
     </dependency> 

     <!-- Servlet --> 
     <dependency> 
      <groupId>javax.servlet</groupId> 
      <artifactId>servlet-api</artifactId> 
      <version>2.5</version> 
      <scope>provided</scope> 
     </dependency> 

     <!-- Thymleaf --> 
     <dependency> 
      <groupId>org.thymeleaf</groupId> 
      <artifactId>thymeleaf</artifactId> 
      <version>2.1.4.RELEASE</version> 
     </dependency> 

     <dependency> 
      <groupId>org.thymeleaf</groupId> 
      <artifactId>thymeleaf-spring4</artifactId> 
      <version>2.1.4.RELEASE</version> 
     </dependency> 

     <dependency> 
      <groupId>org.thymeleaf.extras</groupId> 
      <artifactId>thymeleaf-extras-springsecurity4</artifactId> 
      <version>2.1.2.RELEASE</version> 
     </dependency> 

    </dependencies> 

    <build> 
     <plugins> 
      <plugin> 
       <groupId>org.apache.maven.plugins</groupId> 
       <artifactId>maven-war-plugin</artifactId> 
       <version>2.5</version> 
       <configuration> 
        <failOnMissingWebXml>false</failOnMissingWebXml> 
       </configuration> 
      </plugin> 
     </plugins> 
    </build> 
</project> 

Điều kỳ lạ nhất là nó sụp đổ hoàn toàn ngẫu nhiên. Nó hoạt động tốt nhưng sau vài lần, nó bắt đầu gặp sự cố với mỗi lần xây dựng tiếp theo. Khi nó bắt đầu crashing tôi loại bỏ maven xây dựng "mục tiêu" thư mục và bộ nhớ cache không hợp lệ và khởi động lại IntelliJ Idea. Bạn có biết có gì sai không?

PS. Tôi sử dụng IntellijIdea 13.1.6.

Answer 1

Có thể bạn đang gặp phải một số vấn đề phụ thuộc tinh tế.

Đó là advised to declare inter-beans dependencies like this:

... 
imports 
... 
@Configuration 
@EnableWebMvc 
@ComponentScan("com.myapp.controllers") 
public class WebConfiguration extends WebMvcConfigurerAdapter { 

    private static final String TEMPLATE_RESOLVER_PREFIX = "/WEB-INF/templates/"; 
    private static final String TEMPLATE_RESOLVER_SUFFIX = ".html"; 
    private static final String TEMPLATE_RESOLVER_TEMPLATE_MODE = "HTML5"; 

    @Bean 
    public ViewResolver viewResolver() { 
     ThymeleafViewResolver viewResolver = new ThymeleafViewResolver(); 
     viewResolver.setTemplateEngine(templateEngine()); 

     return viewResolver; 
    } 

    @Bean 
    public TemplateEngine templateEngine() { 
     SpringTemplateEngine templateEngine = new SpringTemplateEngine(); 
     templateEngine.setTemplateResolver(templateResolver()); 

     return templateEngine; 
    } 

    @Bean 
    public TemplateResolver templateResolver() { 
     TemplateResolver templateResolver = new ServletContextTemplateResolver(); 
     templateResolver.setPrefix(TEMPLATE_RESOLVER_PREFIX); 
     templateResolver.setSuffix(TEMPLATE_RESOLVER_SUFFIX); 
     templateResolver.setTemplateMode(TEMPLATE_RESOLVER_TEMPLATE_MODE); 

     return templateResolver; 
    } 

Answer 2

Điều đầu tiên tôi muốn kiểm tra là bạn không có nhiều phiên bản của cùng một thư viện trên classpath vì điều này có thể gây ra vấn đề thực sự khó hiểu.

Maven có nghĩa vụ phải giải quyết vấn đề này nhưng tôi biết rằng IDEA có một số vấn đề với các phiên bản phụ thuộc xung đột khi sử dụng Gradle để có thể cũng là trường hợp của Maven.

Để kiểm tra điều này, hãy mở rộng thư mục bên ngoài Thư viện bên ngoài "trong chế độ xem dự án và kiểm tra xem bạn chỉ có một mục nhập cho mỗi thư viện.