Spring 问题解决

未加上@ResponseBody注释导致无法启动

报错:org.thymeleaf.exceptions.TemplateInputException: Error resolving template [clock/export], template might not exist or might not be accessible by any of the configured Template Resolvers

解决方法：在controller前加上@ResponseBody注释。

配置文件不生效

原因

• Maven可能存在资源过滤的问题。
• java版本不对，无法正常编译配置文件。

解决方法:

• 将pom配置完善。

<build>
   <resources>
       <resource>
           <directory>src/main/java</directory>
           <includes>
               <include>**/*.properties</include>
               <include>**/*.xml</include>
           </includes>
           <filtering>false</filtering>
       </resource>
       <resource>
           <directory>src/main/resources</directory>
           <includes>
               <include>**/*.properties</include>
               <include>**/*.xml</include>
           </includes>
           <filtering>false</filtering>
       </resource>
   </resources>
</build>

• 指定java版本。

<properties>
    <java.version>1.8</java.version>
</properties>

缺少log4j依赖

报错:java.lang.ClassNotFoundException: org.apache.log4j.Priority

解决方法：导入 log4j 依赖即可。

<!-- https://mvnrepository.com/artifact/log4j/log4j -->
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
</dependency>

Spring Boot 启动失败

报错: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.

解决方法

1. 检查入口 Application 文件是否加了@SpringBootApplication注解，或者@SpringBootConfiguration,@EnableAutoConfiguration两个注解。
2. 检查pom.xml是否正确添加 web 依赖。

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