SpringBoot3.2.3+Jetty12中嵌套Jar资源的DefaultServlet 404问题排查

已完成向SpringBoot 3.2.3和Jetty 12.0.6的迁移，遇到DefaultServlet的baseResource注册问题——相同配置在SpringBoot 2.7.X及旧版Jetty环境下可正常运行。

自定义JettyServletWebServerFactory添加配置、注册Servlet后，将baseResource定义为嵌套Jar资源时，使用java -jar启动服务会出现404异常，但用IntelliJ IDEA启动服务却能正常工作，看起来baseResource未被作为嵌套资源处理。

源代码 #

package com.example.demo;

import jakarta.servlet.ServletRegistration;
import org.eclipse.jetty.ee10.servlet.DefaultServlet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.embedded.jetty.JettyServletWebServerFactory;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;

import java.net.URL;

@SpringBootApplication
public class DemoApplication implements WebServerFactoryCustomizer<JettyServletWebServerFactory> {

    private static final Logger LOGGER = LoggerFactory.getLogger(DemoApplication.class);

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

    @Override
    public void customize(JettyServletWebServerFactory factory) {

        DefaultServlet defaultServlet = new DefaultServlet();
        factory.addInitializers(ctx -> {

            ServletRegistration sr = ctx.addServlet("swagger-ui", defaultServlet);
            sr.addMapping("/swagger-ui/*");

            URL externalForm = DemoApplication.class.getResource("/static/swagger-ui/");

            LOGGER.info("### resources: " + externalForm.toExternalForm());
            sr.setInitParameter("baseResource", externalForm.toExternalForm());
            sr.setInitParameter("pathInfoOnly", "true");

        });
        LOGGER.info("WebServer customized with swagger-ui");

    }
}

pom.xml内容 #

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.2.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jersey</artifactId>
            <exclusions>
                <!-- Exclude the Tomcat dependency -->
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
                <exclusion>
                    <artifactId>tomcat-embed-el</artifactId>
                    <groupId>org.apache.tomcat.embed</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <!-- Exclude the Tomcat dependency -->
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

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

</project>

内容的提问来源于stack exchange，提问作者lmetrak