我正在尝试从Youtube制作 SpringBoot 教程。但在IntelliJ + Maven中,不是 Eclipse。在 1 小时标记处,他们添加了 jasper 依赖项,然后运行程序,它运行良好。
在我添加 jasper 依赖项之前,我没有错误。添加后,我收到此错误:
Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is java.lang.NoClassDefFoundError: jakarta/servlet/jsp/JspFactory.
这是我的主要应用程序文件:
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
@SpringBootApplication
public class CoursesWebApp {
public static void main(String[] args) {
SpringApplication.run(CoursesWebApp.class, args);
}
}
和控制器文件
package com.example.springboot;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class CoursesController {
@RequestMapping("/courses")
public void coursesDisplay() {
System.out.println("Welcome to courses!");
//return "course.jsp";
}
}
这是我的 pom.xml 文件:
<?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>2.5.2</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>spring-boot</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-boot</name>
<description>Project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jersey</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web-services</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jasper</artifactId>
<version>10.0.8</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
我已经安装了 Tomcat 版本 10.0.8 并将 Jasper 与相同版本匹配。
我试着做public class CoursesWebApp extends SpringBootServletInitializer
,没有用。
有注释@SpringBootApplication
。
我试图添加
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
随着范围更改为默认或编译,没有工作。
我对此完全陌生,我不知道如何解决它。感觉像是小东西,但我看不到。
在此先感谢您的帮助!