java.lang.IllegalStateException：无法在 servlet 上下文上注册“servlet CamelServlet”。可能已经注册了？

Question

我正在尝试使用 Spring boot 运行 Baeldung Apache Camle。我只是想学习 Apache Camle，Apache Camle 如何与 Spring boot 配合使用。但无法运行示例应用程序并出现以下问题。请指导我出了什么问题。

Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled.
21:54:03.145 [main] ERROR o.s.boot.SpringApplication - Application run failed
org.springframework.context.ApplicationContextException: Unable to start web server
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:164)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:610)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:738)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:440)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1295)
        at com.baeldung.camel.boot.Application.main(Application.java:35)
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:142)
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:104)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:489)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:211)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:183)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:161)
        ... 8 common frames omitted
Caused by: java.lang.IllegalStateException: Failed to register 'servlet CamelServlet' on the servlet context. Possibly already registered?
        at org.springframework.boot.web.servlet.DynamicRegistrationBean.register(DynamicRegistrationBean.java:122)
        at org.springframework.boot.web.servlet.RegistrationBean.onStartup(RegistrationBean.java:52)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.selfInitialize(ServletWebServerApplicationContext.java:236)
        at org.springframework.boot.web.embedded.tomcat.TomcatStarter.onStartup(TomcatStarter.java:52)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4850)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1332)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1322)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
        at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:145)
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:866)
        at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:845)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1332)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1322)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
        at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:145)
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:866)
        at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:240)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.StandardService.startInternal(StandardService.java:433)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:917)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.startup.Tomcat.start(Tomcat.java:488)
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:123)
        ... 13 common frames omitted

Answer 1

更改 seu pom.xml 段落：

<?xml version="1.0" encoding="UTF-8"?>

4.0.0 org.springframework.boot spring-boot-starter-父级 3.0.1 开发者cryss 骆驼 0.0.1-快照 骆驼 测试骆驼

<properties>
    <java.version>17</java.version>
</properties>


<dependencies>
    <dependency>
        <groupId>org.apache.camel.springboot</groupId>
        <artifactId>camel-servlet-starter</artifactId>
        <version>4.3.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.camel.springboot</groupId>
        <artifactId>camel-jackson-starter</artifactId>
        <version>4.3.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.camel.springboot</groupId>
        <artifactId>camel-swagger-java-starter</artifactId>
        <version>3.22.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.camel.springboot</groupId>
        <artifactId>camel-spring-boot-starter</artifactId>
        <version>4.3.0</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-spring-xml</artifactId>
        <version>4.3.0</version>
    </dependency>
</dependencies>


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

进行全新安装，然后执行新项目。您可以解决问题。这个错误与 Spring 的关系是错误的。