包org.springframework.boot不存在

Question

我试图在我的机器上运行一个小的基本Spring启动程序,当我clean compile在maven上运行时(甚至在尝试spring-boot:run之前)我得到以下错误:

[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /C:/Users/hbenayed/eclipse-workspace/SpringBootPoc/src/main/java/com/benayed/spboot/poc/SpringBootPoc/SpringBootPocApplication.java:[3,32] package org.springframework.boot does not exist
[ERROR] /C:/Users/hbenayed/eclipse-workspace/SpringBootPoc/src/main/java/com/benayed/spboot/poc/SpringBootPoc/SpringBootPocApplication.java:[4,46] package org.springframework.boot.autoconfigure does not exist
[ERROR] /C:/Users/hbenayed/eclipse-workspace/SpringBootPoc/src/main/java/com/benayed/spboot/poc/SpringBootPoc/SpringBootPocApplication.java:[6,2] cannot find symbol
  symbol: class SpringBootApplication
[ERROR] /C:/Users/hbenayed/eclipse-workspace/SpringBootPoc/src/main/java/com/benayed/spboot/poc/SpringBootPoc/SpringBootPocApplication.java:[10,17] cannot find symbol
  symbol:   variable SpringApplication
  location: class com.benayed.spboot.poc.SpringBootPoc.SpringBootPocApplication
[INFO] 4 errors 
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 14.807 s
[INFO] Finished at: 2018-02-18T03:28:24+01:00
[INFO] Final Memory: 19M/167M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project SpringBootPoc: Compilation failure: Compilation failure:
[ERROR] /C:/Users/hbenayed/eclipse-workspace/SpringBootPoc/src/main/java/com/benayed/spboot/poc/SpringBootPoc/SpringBootPocApplication.java:[3,32] package org.springframework.boot does not exist
[ERROR] /C:/Users/hbenayed/eclipse-workspace/SpringBootPoc/src/main/java/com/benayed/spboot/poc/SpringBootPoc/SpringBootPocApplication.java:[4,46] package org.springframework.boot.autoconfigure does not exist
[ERROR] /C:/Users/hbenayed/eclipse-workspace/SpringBootPoc/src/main/java/com/benayed/spboot/poc/SpringBootPoc/SpringBootPocApplication.java:[6,2] cannot find symbol
[ERROR] symbol: class SpringBootApplication
[ERROR] /C:/Users/hbenayed/eclipse-workspace/SpringBootPoc/src/main/java/com/benayed/spboot/poc/SpringBootPoc/SpringBootPocApplication.java:[10,17] cannot find symbol
[ERROR] symbol:   variable SpringApplication
[ERROR] location: class com.benayed.spboot.poc.SpringBootPoc.SpringBootPocApplication
[ERROR] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project SpringBootPoc: Compilation failure
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.compiler.CompilationFailureException: Compilation failure
    at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:858)
    at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:129)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
    ... 20 more
[ERROR] 
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

这是我的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>com.benayed.spboot.poc</groupId>
    <artifactId>SpringBootPoc</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

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

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.10.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-jpa</artifactId> -->
        <!-- </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>

这是我的java类:

package com.benayed.spboot.poc.SpringBootPoc;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBootPocApplication {

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

}

我尝试了很多我可以在互联网上找到的解决方案,例如删除.m2存储库,在spring-boot-maven-plugin插件中添加不同的标签(版本,分叉......),我很确定,这是引起问题的部分

有什么建议 ？

Answer 1

您需要添加此依赖项

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

那么它将起作用。

Answer 2

如果项目的 .mvn 文件夹中存在任何 Wrapper 文件夹，请将其删除。另外，转到文件->设置->构建、执行、部署->构建工具->Maven->将 Maven 主路径设置为 Bundled(Maven 3)

Answer 3

您已定义了0个编译依赖项，因为已注释掉了，所以仅定义了测试编译依赖项spring-boot-starter-data-jpa。Spring启动程序会引入其他依赖项（包括其他启动程序）来创建编译时所需的所有内容。spring-boot-starter-data-jpa取消对依赖项的注释，和/或重新评估您实际想要的依赖项。

Answer 4

1) 关闭项目 2) 再次导入项目并选中自动导入

这对我有用。也许也适合你。