Question

我有一个spring boot Web应用程序，我试图将其作为嵌入Tomcat而不是使用容器的独立应用程序运行。

我正在开发IntelliJ，我已经将运行配置设置为Spring Boot，并且应用程序正在从IntelliJ运行。

我在IntelliJ中创建了一个工件来创建一个JAR文件，我将其设置为包含Maven的所有依赖项。

但是，当我运行应用程序时出现错误;

14:52:19.303 [main] ERROR o.s.boot.SpringApplication - Application startup failed
org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean.
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:133) ~[NatLocApp.jar:na]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:531) ~[NatLocApp.jar:na]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[NatLocApp.jar:na]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752) [NatLocApp.jar:na]
    at org.springframework.boot.SpringApplication.doRun(SpringApplication.java:347) [NatLocApp.jar:na]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:295) [NatLocApp.jar:na]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1112) [NatLocApp.jar:na]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1101) [NatLocApp.jar:na]
    at com.nationallocums.Application.main(Application.java:13) [NatLocApp.jar:na]
Caused by: org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean.
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.getEmbeddedServletContainerFactory(EmbeddedWebApplicationContext.java:183) ~[NatLocApp.jar:na]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:156) ~[NatLocApp.jar:na]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:130) ~[NatLocApp.jar:na]
    ... 8 common frames omitted

根据我的研究，我可以看到这与Tomcat没有嵌入或者可能包含在最终JAR文件中的多个Tomcat实例有关，但我似乎无法解决问题。

这是我的pom.xml文件的样子;

<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-taglibs</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.37</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>

        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>

        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.4</version>
        </dependency>

        <dependency>
            <groupId>net.sf.opencsv</groupId>
            <artifactId>opencsv</artifactId>
            <version>2.3</version>
        </dependency>

        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.4</version>
        </dependency>

        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.9.2</version>
        </dependency>
    </dependencies>

我已经尝试将tomcat依赖项设置为具有“提供”范围并完全删除范围标记，但似乎没有任何区别。

Answer 1

你的pom.xml文件中应该有spring-boot-maven-plugin。和包装设置为jar。

然后你可以：

$ mvn package
$ java -jar target/mymodule-0.0.1-SNAPSHOT.jar

Answer 2

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-tomcat</artifactId>
    <scope>provided</scope>
</dependency>

解决方案删除此行：“<scope>provided</scope>”

范围属性的可能值概述为here。提供的范围描述如下：

这很像编译，但表示希望JDK或容器在运行时提供依赖。例如，在为Java Enterprise Edition构建Web应用程序时，您可以将Servlet API和相关Java EE API的依赖关系设置为提供的范围，因为Web容器提供了这些类。此范围仅在编译和测试类路径中可用，并且不可传递。

Spring Boot由于缺少EmbeddedServletContainerFactory bean而无法启动EmbeddedWebApplicationContext

2 个答案: