幾天前我看過 Stack Overflow。我的問題似乎很常見，但我無法解決。我試過這些方法1和2。這是我的 application.propreties ：spring.datasource.driver-class-name= org.postgresql.Driverspring.datasource.url=jdbc:postgresql://localhost:5433/mydatabasespring.datasource.username=usernamespring.datasource.password=passwordspring.jpa.hibernate.ddl-auto=createspring.main.web-application-type=none當(dāng)我嘗試運行它時，它給了我以下錯誤：org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean這些是我的主要課程：@SpringBootApplicationpublic class StartApplication {    @Autowired    BookRepository repository;    public static void main(String[] args) {        SpringApplication.run(Application.class, args);    }}這是我的 pom.xml：<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>toto</groupId>    <artifactId>toto</artifactId>    <version>1.0-SNAPSHOT</version>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>2.1.2.RELEASE</version>    </parent>    <properties>        <java.version>1.8</java.version>        <downloadSources>true</downloadSources>        <downloadJavadocs>true</downloadJavadocs>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-data-jpa</artifactId>        </dependency>        <dependency>            <groupId>org.postgresql</groupId>            <artifactId>postgresql</artifactId>        </dependency>在此先感謝您的幫助。