java - 我在运行 spring boot 项目时遇到错误

Question

我是java和Spring boot的初学者，当我构建简单的项目并运行它时，我收到有关无法加载主类的错误，但我不知道为什么？有人可以帮助我吗？非常感谢!

这是我的项目结构: 1

和我的主课:

package app3;

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

@SpringBootApplication
public class App3 {
    public static void main(String[] args) {
        SpringApplication.run(App3.class, args);
    }
}

我的 Controller 文件

package app3;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

// Đánh dấu đây là một Controller
// Nơi tiếp nhận các reqquest từ phía người dùng
@Controller
public class WebController {

    // Đón nhận request GET
    @GetMapping("/") // Nếu người dùng request tới địa chỉ "/"
    public String index() {
        return "index"; // Trả về file index.html
    }
}

我的 XML 文件:

<?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>
    <packaging>pom</packaging>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.0.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>app3</groupId>
    <artifactId>spring-boot-learning</artifactId>
    <version>0.0.2-SNAPSHOT</version>
    <name>spring-boot-learning</name>
    <description>Everything about Spring Boot</description>


    <dependencies>

        <!--spring mvc, rest-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- thymeleaf -->
        <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>    
                <mainClass>app3.App3</mainClass>
            </configuration>
        </plugin>
        </plugins>
    </build>

</project>

和资源字典中的简单html文件

然后我输入命令mvn spring-boot:run -e

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.google.inject.internal.cglib.core.$ReflectUtils$1 (file:/usr/share/maven/lib/guice.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of com.google.inject.internal.cglib.core.$ReflectUtils$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO] 
[INFO] ---------------------< app3:spring-boot-learning >----------------------
[INFO] Building spring-boot-learning 0.0.2-SNAPSHOT
[INFO] --------------------------------[ pom ]---------------------------------
[INFO] 
[INFO] >>> spring-boot-maven-plugin:2.2.0.RELEASE:run (default-cli) > test-compile @ spring-boot-learning >>>
[INFO] 
[INFO] <<< spring-boot-maven-plugin:2.2.0.RELEASE:run (default-cli) < test-compile @ spring-boot-learning <<<
[INFO] 
[INFO] 
[INFO] --- spring-boot-maven-plugin:2.2.0.RELEASE:run (default-cli) @ spring-boot-learning ---
[INFO] Attaching agents: []
Error: Could not find or load main class app3.App3
Caused by: java.lang.ClassNotFoundException: app3.App3
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  1.576 s
[INFO] Finished at: 2019-11-11T23:37:45+07:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.2.0.RELEASE:run (default-cli) on project spring-boot-learning: Application finished with exit code: 1 -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.2.0.RELEASE:run (default-cli) on project spring-boot-learning: Application finished with exit code: 1
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:215)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:566)
    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.MojoExecutionException: Application finished with exit code: 1
    at org.springframework.boot.maven.RunMojo.runWithForkedJvm (RunMojo.java:108)
    at org.springframework.boot.maven.AbstractRunMojo.doRunWithForkedJvm (AbstractRunMojo.java:284)
    at org.springframework.boot.maven.AbstractRunMojo.run (AbstractRunMojo.java:249)
    at org.springframework.boot.maven.AbstractRunMojo.execute (AbstractRunMojo.java:205)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:566)
    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)
[ERROR] 
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[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/MojoExecutionException

当我输入mvn clean spring-boot:start -e我得到日志:

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.google.inject.internal.cglib.core.$ReflectUtils$1 (file:/usr/share/maven/lib/guice.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of com.google.inject.internal.cglib.core.$ReflectUtils$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO] 
[INFO] ---------------------< app3:spring-boot-learning >----------------------
[INFO] Building spring-boot-learning 0.0.2-SNAPSHOT
[INFO] --------------------------------[ pom ]---------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:3.1.0:clean (default-clean) @ spring-boot-learning ---
[INFO] 
[INFO] --- spring-boot-maven-plugin:2.2.0.RELEASE:start (default-cli) @ spring-boot-learning ---
[INFO] Attaching agents: []
Error: Could not find or load main class app3.App3
Caused by: java.lang.ClassNotFoundException: app3.App3
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  2.362 s
[INFO] Finished at: 2019-11-11T23:39:46+07:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.2.0.RELEASE:start (default-cli) on project spring-boot-learning: Could not contact Spring Boot application: Failed to retrieve RMIServer stub: javax.naming.CommunicationException [Root exception is java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is: 
[ERROR]         java.net.SocketException: Connection reset]
[ERROR] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.2.0.RELEASE:start (default-cli) on project spring-boot-learning: Could not contact Spring Boot application
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:215)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:566)
    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.MojoFailureException: Could not contact Spring Boot application
    at org.springframework.boot.maven.StartMojo.waitForSpringApplication (StartMojo.java:185)
    at org.springframework.boot.maven.StartMojo.runWithForkedJvm (StartMojo.java:96)
    at org.springframework.boot.maven.AbstractRunMojo.doRunWithForkedJvm (AbstractRunMojo.java:284)
    at org.springframework.boot.maven.AbstractRunMojo.run (AbstractRunMojo.java:249)
    at org.springframework.boot.maven.AbstractRunMojo.execute (AbstractRunMojo.java:205)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:566)
    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: java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.CommunicationException [Root exception is java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is: 
        java.net.SocketException: Connection reset]
    at javax.management.remote.rmi.RMIConnector.connect (RMIConnector.java:370)
    at javax.management.remote.JMXConnectorFactory.connect (JMXConnectorFactory.java:270)
    at org.springframework.boot.maven.SpringApplicationAdminClient.connect (SpringApplicationAdminClient.java:116)
    at org.springframework.boot.maven.StartMojo$CreateJmxConnector.call (StartMojo.java:271)
    at org.springframework.boot.maven.StartMojo$CreateJmxConnector.call (StartMojo.java:260)
    at org.springframework.boot.maven.StartMojo.execute (StartMojo.java:240)
    at org.springframework.boot.maven.StartMojo.waitForForkedSpringApplication (StartMojo.java:195)
    at org.springframework.boot.maven.StartMojo.waitForSpringApplication (StartMojo.java:178)
    at org.springframework.boot.maven.StartMojo.runWithForkedJvm (StartMojo.java:96)
    at org.springframework.boot.maven.AbstractRunMojo.doRunWithForkedJvm (AbstractRunMojo.java:284)
    at org.springframework.boot.maven.AbstractRunMojo.run (AbstractRunMojo.java:249)
    at org.springframework.boot.maven.AbstractRunMojo.execute (AbstractRunMojo.java:205)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)

    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:566)
    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: javax.naming.CommunicationException
    at com.sun.jndi.rmi.registry.RegistryContext.lookup (RegistryContext.java:137)
    at com.sun.jndi.toolkit.url.GenericURLContext.lookup (GenericURLContext.java:207)
    at javax.naming.InitialContext.lookup (InitialContext.java:409)
    at javax.management.remote.rmi.RMIConnector.findRMIServerJNDI (RMIConnector.java:1839)

    at org.springframework.boot.maven.StartMojo$CreateJmxConnector.call (StartMojo.java:271)
    at org.springframework.boot.maven.StartMojo$CreateJmxConnector.call (StartMojo.java:260)
    at org.springframework.boot.maven.StartMojo.execute (StartMojo.java:240)
    at org.springframework.boot.maven.StartMojo.waitForForkedSpringApplication (StartMojo.java:195)
    at org.springframework.boot.maven.StartMojo.waitForSpringApplication (StartMojo.java:178)
    at org.springframework.boot.maven.StartMojo.runWithForkedJvm (StartMojo.java:96)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:566)
    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: java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is: 
        java.net.SocketException: Connection reset
    at sun.rmi.transport.tcp.TCPChannel.createConnection (TCPChannel.java:300)
    at sun.rmi.transport.tcp.TCPChannel.newConnection (TCPChannel.java:196)
    at sun.rmi.server.UnicastRef.newCall (UnicastRef.java:338)
    at sun.rmi.registry.RegistryImpl_Stub.lookup (RegistryImpl_Stub.java:112)
    at com.sun.jndi.rmi.registry.RegistryContext.lookup (RegistryContext.java:133)
    at com.sun.jndi.toolkit.url.GenericURLContext.lookup (GenericURLContext.java:207)
    at javax.naming.InitialContext.lookup (InitialContext.java:409)
    at javax.management.remote.rmi.RMIConnector.findRMIServerJNDI (RMIConnector.java:1839)
    at javax.management.remote.rmi.RMIConnector.findRMIServer (RMIConnector.java:1813)
    at javax.management.remote.rmi.RMIConnector.connect (RMIConnector.java:302)
    at javax.management.remote.JMXConnectorFactory.connect (JMXConnectorFactory.java:270)
    at org.springframework.boot.maven.SpringApplicationAdminClient.connect (SpringApplicationAdminClient.java:116)
    at org.springframework.boot.maven.StartMojo$CreateJmxConnector.call (StartMojo.java:271)
    at org.springframework.boot.maven.StartMojo$CreateJmxConnector.call (StartMojo.java:260)
    at org.springframework.boot.maven.StartMojo.execute (StartMojo.java:240)
    at org.springframework.boot.maven.StartMojo.waitForForkedSpringApplication (StartMojo.java:195)
    at org.springframework.boot.maven.StartMojo.waitForSpringApplication (StartMojo.java:178)
    at org.springframework.boot.maven.StartMojo.runWithForkedJvm (StartMojo.java:96)
    at org.springframework.boot.maven.AbstractRunMojo.doRunWithForkedJvm (AbstractRunMojo.java:284)
    at org.springframework.boot.maven.AbstractRunMojo.run (AbstractRunMojo.java:249)
    at org.springframework.boot.maven.AbstractRunMojo.execute (AbstractRunMojo.java:205)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:566)
    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: java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read (SocketInputStream.java:186)
    at java.net.SocketInputStream.read (SocketInputStream.java:140)
    at java.io.BufferedInputStream.fill (BufferedInputStream.java:252)
    at java.io.BufferedInputStream.read (BufferedInputStream.java:271)
    at java.io.DataInputStream.readByte (DataInputStream.java:270)
    at sun.rmi.transport.tcp.TCPChannel.createConnection (TCPChannel.java:239)
    at sun.rmi.transport.tcp.TCPChannel.newConnection (TCPChannel.java:196)
    at sun.rmi.server.UnicastRef.newCall (UnicastRef.java:338)
    at sun.rmi.registry.RegistryImpl_Stub.lookup (RegistryImpl_Stub.java:112)
    at com.sun.jndi.rmi.registry.RegistryContext.lookup (RegistryContext.java:133)
    at com.sun.jndi.toolkit.url.GenericURLContext.lookup (GenericURLContext.java:207)
    at javax.naming.InitialContext.lookup (InitialContext.java:409)
    at javax.management.remote.rmi.RMIConnector.findRMIServerJNDI (RMIConnector.java:1839)
    at javax.management.remote.rmi.RMIConnector.findRMIServer (RMIConnector.java:1813)
    at javax.management.remote.rmi.RMIConnector.connect (RMIConnector.java:302)
    at javax.management.remote.JMXConnectorFactory.connect (JMXConnectorFactory.java:270)
    at org.springframework.boot.maven.SpringApplicationAdminClient.connect (SpringApplicationAdminClient.java:116)
    at org.springframework.boot.maven.StartMojo$CreateJmxConnector.call (StartMojo.java:271)
    at org.springframework.boot.maven.StartMojo$CreateJmxConnector.call (StartMojo.java:260)
    at org.springframework.boot.maven.StartMojo.execute (StartMojo.java:240)
    at org.springframework.boot.maven.StartMojo.waitForForkedSpringApplication (StartMojo.java:195)
    at org.springframework.boot.maven.StartMojo.waitForSpringApplication (StartMojo.java:178)
    at org.springframework.boot.maven.StartMojo.runWithForkedJvm (StartMojo.java:96)
    at org.springframework.boot.maven.AbstractRunMojo.doRunWithForkedJvm (AbstractRunMojo.java:284)
    at org.springframework.boot.maven.AbstractRunMojo.run (AbstractRunMojo.java:249)
    at org.springframework.boot.maven.AbstractRunMojo.execute (AbstractRunMojo.java:205)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
       at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:566)
    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)
[ERROR] 
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[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

有人可以帮助我吗!非常感谢!

Answer 1

删除<packaging>pom</packaging>来自您的pom.xml然后运行mvn clean install

应该可以

you have used packaging type pom, you should use the jar, The default packaging type is jar, If you don't have any it will use packaging as jar

The packaging type of a Maven project specifies the type of artifact the project produces. There are many built-in Maven packaging types (for example, jar, war, and ear).

A pom type is packaging a kind container of submodules, a submodule is represented by a subdirectory in the same directory