Spring boot 配置在字符串STS中不工作

在windows7中设置环境时，我面临两个问题

问题#1） 当运行SpringBootVersion1.5.3时，我得到的错误如下

Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication
    at com.example.MongodbdemoApplication.main(MongodbdemoApplication.java:13)
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.SpringApplication
    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)

我的解决方案：

@RestController
public class PersonController {

    @Autowired
    PersonRepository repo;

}

package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;


@SpringBootApplication
@ComponentScan(basePackages = {"com.example.*"})
public class MongodbdemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(MongodbdemoApplication.class, args);
    }
}

当我将版本更改为1.4.6时，其工作正常。即使在谷歌搜索之后，我也找不到问题

问题2） Spring启动版本：1.4.6

我的完整代码在

com.example

包中。但是在

RestController

类中，无法连接

PersonRepository

类。代码如下

package com.example;

import java.util.Date;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

控制器类：

@RestController
public class PersonController {

    @Autowired
    PersonRepository repo;

}

package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;


@SpringBootApplication
@ComponentScan(basePackages = {"com.example.*"})
public class MongodbdemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(MongodbdemoApplication.class, args);
    }
}

**PersonRepository：**

package com.example;

import org.springframework.data.mongodb.repository.MongoRepository;


public interface PersonRepository  extends MongoRepository<Person, String>{

}

package com.example;

import org.springframework.data.mongodb.repository.MongoRepository;

public interface AddressRepository extends MongoRepository<Address, Integer> {    
}

错误：

Error Logs:
***************************
APPLICATION FAILED TO START
***************************

Description:

Field repo in com.example.PersonController required a bean of type 'com.example.PersonRepository' that could not be found.


Action:

Consider defining a bean of type 'com.example.PersonRepository' in your configuration.

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>com.example</groupId>
    <artifactId>mongodbdemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>mongodbdemo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

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

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

4.0.0
com.example
Mongodbemo
0.0.1-快照
罐子
Mongodbemo
SpringBoot的演示项目
org.springframework.boot
spring启动程序父级
1.5.3.1发布
UTF-8
UTF-8
1.8
org.springframework.boot
spring启动程序数据mongodb
org.springframework.boot
SpringBootStarterWeb
org.projectlombok
龙目
真的
org.springframework.boot
弹簧起动试验
测试
org.springframework.boot
springbootmaven插件

---

步骤尝试添加

@ComponentScan（basePackages={“com.example”}）

，但这并不能解决我的问题。

问题1和问题2的解决方案

正如Deinum先生评论的那样，我的jar已经损坏，所以我删除了.m2文件夹并重新构建了项目。这一次很好

---

它与我的sts配置无关，它与已损坏的jar相关。

当您在1.5.3降级中出错时，很难解决问题。我怀疑您的存储库中有一个损坏的jar。运行

mvn dependency:purge local repository

以清理存储库。在这种情况下添加

@ComponentScan

也不会改变任何东西，因为

@SpringBootApplication

@M.Deinum中已经定义了这一点，您在清除jar后就可以正常工作了