Question

这是我正在运行的测试：

@SpringBootApplication
@EnableSwagger2 
@ComponentScan(basePackages="com.tsinghua.controller,com.tsinghua.manager,com.tsinghua.facade")
public class App extends SpringBootServletInitializer implements      EmbeddedServletContainerCustomizer {

public static void main(String[] args) {
    SpringApplication.run(App.class, args);
}

@Override  
protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {  
    return builder.sources(App.class);  
}  
public void customize(ConfigurableEmbeddedServletContainer container) {  
    container.setPort(28090);  
}  

@Bean
public Docket mathApi() {
}


@Bean
public Docket serverApi() {
}

private Predicate<String> categoryPaths() {
    return regex("/math.*");
}

private ApiInfo apiInfo() {
}

private ApiInfo serverApiInfo() {
}
}

这是pom.xml：

<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.*.mathservice</groupId>
<artifactId>math</artifactId>
<version>1.0</version>
<packaging>war</packaging>
<name>mathservice</name>
<description>math service</description>
<url>http://maven.apache.org</url>

<repositories>
    <repository>
        <id>mvn-repo</id>
        <url>http://maven.nlpcn.org/</url>
    </repository>
</repositories>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.2.2.RELEASE</version>
</parent>
<dependencies>
    <!--add 2-->
    <dependency>
        <groupId>org.springframework.ws</groupId>
        <artifactId>spring-ws-core</artifactId>
    </dependency>
     <!--https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api-->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.0.1</version>
    </dependency>

    <dependency>
        <groupId>org.ansj</groupId>
        <artifactId>ansj_seg</artifactId>
        <version>3.7.2</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jetty</artifactId>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>2.4.4</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.4.4</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.4.4</version>
    </dependency>

    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger2</artifactId>
        <version>2.2.2</version>
    </dependency>


    <dependency>
        <groupId>io.swagger</groupId>
        <artifactId>swagger-annotations</artifactId>
        <version>1.5.3</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-staticdocs</artifactId>
        <version>2.2.2</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.apache.jena</groupId>
        <artifactId>apache-jena-libs</artifactId>
        <type>pom</type>
        <version>3.0.1</version>
        <exclusions>
            <exclusion>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
            </exclusion>
            <exclusion>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-logging</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-log4j</artifactId>
    </dependency>
    <dependency>
        <groupId>net.sf.json-lib</groupId>
        <artifactId>json-lib</artifactId>
        <version>2.4</version>
        <classifier>jdk15</classifier>
    </dependency>

</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>

    </plugins>
</build>
</project>

这是错误和警告：

[2016-10-20 12:48:48.168] boot - 66451 ERROR [com.tsinghua.common.App.main()] --- SpringApplication: Application startup failed
org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is java.lang.NoSuchMethodError: javax.servlet.ServletContext.addServlet(Ljava/lang/String;Ljavax/servlet/Servlet;)Ljavax/servlet/ServletRegistration$Dynamic;
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:133)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:474)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:957)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:946)
    at com.tsinghua.common.App.main(App.java:37)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.springframework.boot.maven.RunMojo$LaunchRunner.run(RunMojo.java:418)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoSuchMethodError: javax.servlet.ServletContext.addServlet(Ljava/lang/String;Ljavax/servlet/Servlet;)Ljavax/servlet/ServletRegistration$Dynamic;
    at org.springframework.boot.context.embedded.ServletRegistrationBean.onStartup(ServletRegistrationBean.java:171)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.selfInitialize(EmbeddedWebApplicationContext.java:222)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.access$000(EmbeddedWebApplicationContext.java:84)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext$1.onStartup(EmbeddedWebApplicationContext.java:206)
    at org.springframework.boot.context.embedded.jetty.ServletContextInitializerConfiguration$Initializer.callInitializers(ServletContextInitializerConfiguration.java:96)
    at org.springframework.boot.context.embedded.jetty.ServletContextInitializerConfiguration$Initializer.doStart(ServletContextInitializerConfiguration.java:85)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:106)
    at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
    at org.eclipse.jetty.server.handler.ScopedHandler.doStart(ScopedHandler.java:120)
    at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:784)
    at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:294)
    at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1349)
    at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1342)
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:741)
    at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:505)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
    at org.eclipse.jetty.server.Server.start(Server.java:387)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
    at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
    at org.eclipse.jetty.server.Server.doStart(Server.java:354)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.springframework.boot.context.embedded.jetty.JettyEmbeddedServletContainer.initialize(JettyEmbeddedServletContainer.java:83)
    at org.springframework.boot.context.embedded.jetty.JettyEmbeddedServletContainer.<init>(JettyEmbeddedServletContainer.java:72)
    at org.springframework.boot.context.embedded.jetty.JettyEmbeddedServletContainerFactory.getJettyEmbeddedServletContainer(JettyEmbeddedServletContainerFactory.java:389)
    at org.springframework.boot.context.embedded.jetty.JettyEmbeddedServletContainerFactory.getEmbeddedServletContainer(JettyEmbeddedServletContainerFactory.java:135)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:157)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:130)
    ... 13 more
[WARNING] 
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.springframework.boot.maven.RunMojo$LaunchRunner.run(RunMojo.java:418)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is java.lang.NoSuchMethodError: javax.servlet.ServletContext.addServlet(Ljava/lang/String;Ljavax/servlet/Servlet;)Ljavax/servlet/ServletRegistration$Dynamic;
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:133)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:474)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:957)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:946)
    at com.tsinghua.common.App.main(App.java:37)
    ... 6 more
Caused by: java.lang.NoSuchMethodError: javax.servlet.ServletContext.addServlet(Ljava/lang/String;Ljavax/servlet/Servlet;)Ljavax/servlet/ServletRegistration$Dynamic;
    at org.springframework.boot.context.embedded.ServletRegistrationBean.onStartup(ServletRegistrationBean.java:171)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.selfInitialize(EmbeddedWebApplicationContext.java:222)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.access$000(EmbeddedWebApplicationContext.java:84)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext$1.onStartup(EmbeddedWebApplicationContext.java:206)
    at org.springframework.boot.context.embedded.jetty.ServletContextInitializerConfiguration$Initializer.callInitializers(ServletContextInitializerConfiguration.java:96)
    at org.springframework.boot.context.embedded.jetty.ServletContextInitializerConfiguration$Initializer.doStart(ServletContextInitializerConfiguration.java:85)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:106)
    at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
    at org.eclipse.jetty.server.handler.ScopedHandler.doStart(ScopedHandler.java:120)
    at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:784)
    at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:294)
    at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1349)
    at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1342)
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:741)
    at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:505)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
    at org.eclipse.jetty.server.Server.start(Server.java:387)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
    at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
    at org.eclipse.jetty.server.Server.doStart(Server.java:354)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.springframework.boot.context.embedded.jetty.JettyEmbeddedServletContainer.initialize(JettyEmbeddedServletContainer.java:83)
    at org.springframework.boot.context.embedded.jetty.JettyEmbeddedServletContainer.<init>(JettyEmbeddedServletContainer.java:72)
    at org.springframework.boot.context.embedded.jetty.JettyEmbeddedServletContainerFactory.getJettyEmbeddedServletContainer(JettyEmbeddedServletContainerFactory.java:389)
    at org.springframework.boot.context.embedded.jetty.JettyEmbeddedServletContainerFactory.getEmbeddedServletContainer(JettyEmbeddedServletContainerFactory.java:135)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:157)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:130)
    ... 13 more

我正在使用IDEA 15.并且代码可以在另一个人的机器上运行，我将maven 3.0.5更改为他的maven版本3.3.9，但它没有用。

Answer 1

您的构建中存在很多问题。首先，你依赖spring-boot-starter-web（带来Tomcat）和spring-boot-starter-jetty，所以基本上你的应用程序中有两个嵌入式容器。

新移民可能没有意识到这一点，但经验法则只是严格添加必要的内容，看看会发生什么。如果您的应用只使用web启动器，那么很明显，如果您添加jetty，则需要删除其他内容。这是covered in the documentation。

与servlet-api相同。你自己导入了。更糟糕的是，你自己强制推出一个版本。你不应该这样做。 Spring Boot带有一组连贯的依赖管理。如果你开始用你自己的选择覆盖那些，你有责任确保所有这些一起工作。他们显然没有给出堆栈跟踪。

删除servlet-api依赖项（它已由web启动程序提供）并修复了jetty依赖项。

Answer 2

当我使用码头嵌入式服务器时，我遇到了同样的问题，并且只添加了servlet api的依赖项，从而解决了我的问题：

Pom.xml：

<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.1.0</version>
    <scope>provided</scope>
</dependency>

Answer 3

我们遇到了同样的问题，但只是有时是随机的：

无法启动嵌入式容器；嵌套的异常是java.lang.NoSuchMethodError：javax.servlet.ServletContext.addServlet（Ljava / lang / String; Ljavax / servlet / Servlet;）Ljavax / servlet / ServletRegistration $ Dynamic;

我们还使用了“ spring-boot-starter-jetty”依赖项，其中包括“ javax.servlet-api” 3.1.0依赖项。为了安全起见，我们从“ spring-boot-starter-web”依赖中排除了“ spring-boot-starter-tomcat”依赖。

但是我们调查并发现，在我们的项目依赖项中，我们某种程度上也具有servlet-api 2.5依赖项（此依赖项是从其他依赖项继承的）。

在3.1.0中，javax.servlet.ServletContext具有方法'addServlet'。

在2.5中，它没有此方法。

然后，我们了解到maven在我们的应用程序中随机使用了3.1.0版或2.5版。当它随机使用3.1.0时，该应用程序正常启动。当它随机使用没有方法'addServlet'的2.5时，它抛出了'NoSuchMethodError'异常。

要解决此问题，在pom.xml中，我们仅排除了隐藏的2.5'javax.servlet'依赖项：

    <dependency>
        <groupId>our.cool.group</groupId>
        <artifactId>the-artifact-which-includes-2.5-servlet-api-and-we-didnt-know</artifactId>
        <version>${the.artifact.version}</version>
        <exclusions>
            <exclusion>
                <groupId>javax.servlet</groupId>
                <artifactId>servlet-api</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jetty</artifactId>
    </dependency>

无法启动嵌入式容器;嵌套异常是java.lang.NoSuchMethodError：javax.servlet.ServletContext.addServlet

3 个答案: