spring-boot启动报错

Question

Exception in thread "main" java.lang.IllegalArgumentException: Cannot instantiate interface org.springframework.context.ApplicationContextInitializer : org.springframework.boot.devtools.restart.RestartScopeInitializer
    at org.springframework.boot.SpringApplication.createSpringFactoriesInstances(SpringApplication.java:445)
    at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:427)
    at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:420)
    at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:272)
    at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:253)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
    at cn.study.wjh.StudyApplication.main(StudyApplication.java:9)
Caused by: java.lang.UnsupportedClassVersionError: org/springframework/boot/devtools/restart/RestartScopeInitializer has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 52.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:473)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at org.springframework.util.ClassUtils.forName(ClassUtils.java:285)
    at org.springframework.boot.SpringApplication.createSpringFactoriesInstances(SpringApplication.java:438)
    ... 7 more

Process finished with exit code 1

这是我的pom文件

 <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.0.RELEASE</version>
        <relativePath/>
    </parent>
    <dependencies>
      <!--spring-boot-starter-web 依赖-->
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-web</artifactId>
      </dependency>

      <!--热启动依赖-->
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-devtools</artifactId>
          <scope>runtime</scope>
          <optional>true</optional>
          <version>3.0.4</version>
      </dependency>

      <!--lombok 依赖-->
      <dependency>
          <groupId>org.projectlombok</groupId>
          <artifactId>lombok</artifactId>
      </dependency>

      <!--spring-boot-starter-test 依赖-->
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-test</artifactId>
      </dependency>
          <!-- Mysql驱动包 -->
      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
      </dependency>
      <dependency>
          <groupId>org.mybatis.spring.boot</groupId>
          <artifactId>mybatis-spring-boot-starter</artifactId>
          <version>1.3.1</version>
      </dependency>
  </dependencies>

这种情况该怎么办？

Answer 1

这个错误是由于spring-boot-devtools的RestartScopeInitializer类被编译成了Java 11的class文件，而你的Java版本只支持到Java 8的class文件。

解决方法：
1、升级你的Java版本
2、降低spring-boot-devtools的版本，你可以尝试将spring-boot-devtools的版本改为2.3.0.RELEASE，与你的spring-boot-starter-parent版本相匹配