报错信息
Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/util/ClassUtils
at org.springframework.boot.SpringApplication.deduceWebEnvironment(SpringApplication.java:257)
at org.springframework.boot.SpringApplication.initialize(SpringApplication.java:248)
at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:225)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107)
at com.ximen.SpringBootTest.FirstSpringBoot.main(FirstSpringBoot.java:19)
Caused by: java.lang.ClassNotFoundException: org.springframework.util.ClassUtils
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 6 more
求大神解答
pom.xml配置
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.7.RELEASE</version>
</parent>
<groupId>com.ximen</groupId>
<artifactId>SpringBootTest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>SpringBootTest</name>
<url>http://maven.apache.org</url>
<properties>
<jdk.version>1.8</jdk.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<build>
<finalName>bootfirst</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${jdk.version}</source>
<target>${jdk.version}</target>
<encode>${project.build.sourceEncoding}</encode>
</configuration>
</plugin>
</plugins>
</build>
</project>
java测试类
package com.ximen.SpringBootTest;
import org.springframework.boot.*;
import org.springframework.boot.autoconfigure.*;
import org.springframework.stereotype.*;
import org.springframework.web.bind.annotation.*;
@Controller
@EnableAutoConfiguration
public class FirstSpringBoot {
@RequestMapping("/")
@ResponseBody
String home() {
return "Hello World!";
}
public static void main(String[] args) throws Exception {
SpringApplication.run(FirstSpringBoot.class, args);
}
}
http://start.spring.io/ 用这里构建
找不到类,缺包或者是包冲突吧
java.lang.ClassNotFoundException:org.springframework.util.ClassUtils
另外用@springbootapplication,里面包含了
ComponentScan
EnableAutoConfiguration
SpringBootConfiguration
这几个注解,所以除非需要自定义扫描包,否则尽量直接用
SpringBootApplication
今天灵机一动,找到了问题所在,正如报错,缺少包
因为用的maven,当初在下载springframework中的包的时候可能没下完就给关了
解决方法:
到本地maven库(我的是C:\Users\ximen\.m2\repository),删除springframework,然后到eclipse中右键项目,maven-》update project,会重新下载相关包,然后运行,成功
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