java.lang.NoClassDefFoundError: Konnte nicht initialisiert werden org.springframework.web.util.NestedServletException

Question

Ich habe ein Problem, aber ich kann nicht herausfinden, die Ursache für dieses Problem, weil der Fehler ziemlich allgemein ist.

java.lang.NoClassDefFoundError: Could not initialize class org.springframework.web.util.NestedServletException at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:980) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:859) at javax.servlet.http.HttpServlet.service(HttpServlet.java:687) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:844) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:845) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:583) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1160) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1092) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) at org.eclipse.jetty.server.Server.handle(Server.java:518) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:308) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:244) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95) at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93) at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:246) at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:156) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572) at java.lang.Thread.run(Thread.java:745)

Das ist meine Projektstruktur:

Project Structure

Es ist nur ein sehr einfaches Projekt, das ich Jetty mit SpringMVC Embedded verwenden.

Dies ist die pom.xml Datei:

<?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>com.biendltb</groupId> 
<artifactId>com.biendltb.world_map</artifactId> 
<version>1.0-SNAPSHOT</version> 
<packaging>jar</packaging> 

<name>com.biendltb.world_map</name> 

<properties> 
    <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir> 
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
    <jetty.version>9.3.8.v20160314</jetty.version> 
    <spring.version>4.2.5.RELEASE</spring.version> 
    <servlet.version>2.5</servlet.version> 
</properties> 

<dependencies> 
    <dependency> 
     <groupId>javax</groupId> 
     <artifactId>javaee-web-api</artifactId> 
     <version>7.0</version> 
     <scope>provided</scope> 
    </dependency> 

    <!-- SPRING DEPENDENCY --> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-context</artifactId> 
     <version>${spring.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-aop</artifactId> 
     <version>${spring.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-webmvc</artifactId> 
     <version>${spring.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-web</artifactId> 
     <version>${spring.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-core</artifactId> 
     <version>${spring.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-beans</artifactId> 
     <version>4.2.5.RELEASE</version> 
    </dependency> 


    <!-- JETTY DEPENDENCY --> 
    <dependency> 
     <groupId>org.eclipse.jetty</groupId> 
     <artifactId>jetty-server</artifactId> 
     <version>${jetty.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.eclipse.jetty</groupId> 
     <artifactId>jetty-servlet</artifactId> 
     <version>${jetty.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.eclipse.jetty</groupId> 
     <artifactId>jetty-webapp</artifactId> 
     <version>${jetty.version}</version> 
    </dependency> 

    <!-- SERVLET DEPENDENCY --> 
    <dependency> 
     <groupId>javax.servlet</groupId> 
     <artifactId>servlet-api</artifactId> 
     <version>${servlet.version}</version> 
    </dependency> 

    <!-- COMMON LOGGING DEPENDENCY --> 
    <dependency> 
     <groupId>commons-logging</groupId> 
     <artifactId>commons-logging</artifactId> 
     <version>1.1.3</version> 
    </dependency> 
</dependencies> 

<build> 
    <plugins> 
     <plugin> 
      <groupId>org.apache.maven.plugins</groupId> 
      <artifactId>maven-compiler-plugin</artifactId> 
      <version>3.1</version> 
      <configuration> 
       <source>1.7</source> 
       <target>1.7</target> 
       <compilerArguments> 
        <endorseddirs>${endorsed.dir}</endorseddirs> 
       </compilerArguments> 
      </configuration> 
     </plugin> 
     <plugin> 
      <groupId>org.apache.maven.plugins</groupId> 
      <artifactId>maven-dependency-plugin</artifactId> 
      <version>2.6</version> 
      <executions> 
       <execution> 
        <phase>validate</phase> 
        <goals> 
         <goal>copy</goal> 
        </goals> 
        <configuration> 
         <outputDirectory>${endorsed.dir}</outputDirectory> 
         <silent>true</silent> 
         <artifactItems> 
          <artifactItem> 
           <groupId>javax</groupId> 
           <artifactId>javaee-endorsed-api</artifactId> 
           <version>7.0</version> 
           <type>jar</type> 
          </artifactItem> 
         </artifactItems> 
        </configuration> 
       </execution> 
      </executions> 
     </plugin> 
     <plugin> 
      <groupId>org.eclipse.jetty</groupId> 
      <artifactId>jetty-maven-plugin</artifactId> 
      <version>9.3.7.v20160115</version> 
     </plugin> 
     <plugin> 
      <artifactId>maven-war-plugin</artifactId> 
      <version>2.4</version> 
      <configuration> 
       <warSourceDirectory>WebContent</warSourceDirectory> 
       <failOnMissingWebXml>false</failOnMissingWebXml> 
      </configuration> 
     </plugin> 
     <plugin> 
      <groupId>org.apache.maven.plugins</groupId> 
      <artifactId>maven-shade-plugin</artifactId> 
      <version>2.4.3</version> 
      <executions> 
       <execution> 
        <phase>package</phase> 
        <goals> 
         <goal>shade</goal> 
        </goals> 
        <configuration> 
         <createDependencyReducedPom>false</createDependencyReducedPom> 
         <transformers> 
          <transformer 
           implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer"> 
           <mainClass>com.biendltb.main_server.TripMapServer</mainClass> 
          </transformer> 
         </transformers> 
         <filters> 
          <filter> 
           <artifact>*:*</artifact> 
           <excludes> 
            <exclude>META-INF/*.SF</exclude> 
            <exclude>META-INF/*.DSA</exclude> 
            <exclude>META-INF/*.RSA</exclude> 
           </excludes> 
          </filter> 
         </filters> 
        </configuration> 
       </execution> 
      </executions> 
     </plugin> 
     <plugin> 
      <groupId>org.apache.maven.plugins</groupId> 
      <artifactId>maven-resources-plugin</artifactId> 
      <version>2.7</version> 
      <dependencies> 
       <dependency> 
        <groupId>org.apache.maven.shared</groupId> 
        <artifactId>maven-filtering</artifactId> 
        <version>1.3</version> 
       </dependency> 
      </dependencies> 
     </plugin> 
    </plugins> 
    <resources> 
     <resource> 
      <targetPath>webapp</targetPath> 
      <directory>src/main/webapp</directory> 
     </resource> 
     <resource> 
      <directory>src/main/resources</directory> 
     </resource> 
    </resources> 
</build> 

Dies ist die main Klasse:

public class TripMapServer { 

    private static final int DEFAULT_PORT = 8080; 
    private static final String CONTEXT_PATH = "/"; 
    private static final String MAPPING_URL = "/*"; 
    private static final String CONFIG_LOCATION = "com.biendltb.config"; 
    private static final String DEFAULT_PROFILE = "dev"; 

    public static void main(String[] args) throws Exception { 
     new TripMapServer().startJetty(getPortFromArgs(args)); 
    } 

    private static int getPortFromArgs(String[] args) { 
     if (args.length > 0) { 
      try { 
       return Integer.valueOf(args[0]); 
      } catch (NumberFormatException ignore) { 
      } 
     } 
     return DEFAULT_PORT; 
    } 

    private void startJetty(int port) throws Exception { 
     Server server = new Server(port); 
     server.setHandler(getServletContextHandler(getContext())); 
     server.start(); 
     server.join(); 
    } 

    private static ServletContextHandler getServletContextHandler(WebApplicationContext context) throws IOException { 
     ServletContextHandler contextHandler = new ServletContextHandler(); 
     contextHandler.setErrorHandler(null); 
     contextHandler.setContextPath(CONTEXT_PATH); 
     contextHandler.addServlet(new ServletHolder("default", new DispatcherServlet(context)), MAPPING_URL); 
     contextHandler.addEventListener(new ContextLoaderListener(context)); 
     contextHandler.setResourceBase(new ClassPathResource("webapp").getURI().toString()); 
     return contextHandler; 
    } 

    private static WebApplicationContext getContext() { 
     AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext(); 
     context.setConfigLocation(CONFIG_LOCATION); 
     context.getEnvironment().setDefaultProfiles(DEFAULT_PROFILE); 
     return context; 
    } 
} 

Und das ist die Klasse WebConfig.java statt .xml Datei:

@Configuration 
@EnableWebMvc 
@Import({DefaultConfig.class}) 
@ComponentScan(basePackages = {"com.biendltb.controller"}) 
public class WebConfig extends WebMvcConfigurerAdapter{ 
    private static final Charset UTF8 = Charset.forName("UTF-8"); 

    @Autowired 
    public Environment env; 

    @Override 
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { 
     converters.add(stringConverter()); 
    } 

    private StringHttpMessageConverter stringConverter() { 
     StringHttpMessageConverter stringConverter = new StringHttpMessageConverter(); 
     stringConverter.setSupportedMediaTypes(Arrays.asList(new MediaType("text", "plain", UTF8))); 
     return stringConverter; 
    } 

    @Override 
    public void addResourceHandlers(ResourceHandlerRegistry registry) { 
     registry.addResourceHandler("/assets/**").addResourceLocations("classpath:/src/main/resources/").setCachePeriod(Integer.MAX_VALUE); 
     registry.addResourceHandler("/js/**").addResourceLocations("/js/").setCachePeriod(Integer.MAX_VALUE); 
     registry.addResourceHandler("/css/**").addResourceLocations("/css/").setCachePeriod(Integer.MAX_VALUE); 
     registry.addResourceHandler("/img/**").addResourceLocations("/img/").setCachePeriod(Integer.MAX_VALUE); 
    } 

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

    @Bean 
    public InternalResourceViewResolver getInternalResourceViewResolver() { 
     InternalResourceViewResolver resolver = new InternalResourceViewResolver(); 
     resolver.setPrefix("/src/main/resources/pages/"); 
     resolver.setSuffix(".jsp"); 
     return resolver; 
    } 
} 

Bitte helfen Sie herauszufinden, die Ursache oder wie Sie diesen Fehler verfolgen.

Vielen Dank!

Answer 1

Sie vermissen eine Klasse zur Laufzeit. Debuggen Sie den Start und setzen Sie einen Ausnahme-Breakpoint auf NoClassDefFoundError. Dann sehen Sie, welche Klasse nicht gefunden werden kann. Suchen Sie in Ihrer IDE oder im Internet nach dieser Klasse, um herauszufinden, welche Abhängigkeit Ihnen fehlt.

Answer 2

Ich schlage vor, Sie löschen Ihre .m2 Ordner, Es kann vorkommen, dass einige der JAR-Dateien während des Downloads beschädigt sind.

Bitte kommentieren Sie, wenn es Ihnen nicht geholfen hat!