Question

我在CourseApiApp.java文件中有以下代码：

package io.myapp.hellospringboot;

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

@SpringBootApplication
public class CourseApiApp {

    public static void main(String[] args) {

        SpringApplication.run(CourseApiApp.class, args);

    }

}

当我按下播放按钮时，我看到以下控制台消息：

main] i.a.hellospringboot.CourseApiApp         : Starting CourseApiApp on johndoe-MacBook-Pro.local with PID 22730 (/Users/johndoe/Documents/workspace-sts-3.8.4.RELEASE/com.myapp.hello-spring-boot/target/classes started by john doe in /Users/johndoe/Documents/workspace-sts-3.8.4.RELEASE/com.myapp.hello-spring-boot)
2017-05-02 21:28:29.454  INFO 22730 --- [           main] i.a.hellospringboot.CourseApiApp         : No active profile set, falling back to default profiles: default
2017-05-02 21:28:29.552  INFO 22730 --- [           main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@5427c60c: startup date [Tue May 02 21:28:29 CDT 2017]; root of context hierarchy
2017-05-02 21:28:30.838  INFO 22730 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2017-05-02 21:28:30.917  INFO 22730 --- [           main] i.a.hellospringboot.CourseApiApp         : Started CourseApiApp in 2.122 seconds (JVM running for 2.614)
2017-05-02 21:28:30.919  INFO 22730 --- [       Thread-2] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@5427c60c: startup date [Tue May 02 21:28:29 CDT 2017]; root of context hierarchy
2017-05-02 21:28:30.920  INFO 22730 --- [       Thread-2] o.s.j.e.a.AnnotationMBeanExporter        : Unregistering JMX-exposed beans on shutdown

更新：这是POM.xml文件：

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
    </parent>

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

    </dependencies>

    <properties>
        <java.version>1.8</java.version>
    </properties>

我的GreetingController.java文件：

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class GreetingController {

    @RequestMapping("/hello/{name}")
      String hello(@PathVariable String name) {
        return "Hello, " + name + "!";
      }

}

Answer 1

根本原因是maven缓存中的一个损坏的jar。删除~/.m2/repository解决了这个问题。

另一种选择是运行mvn dependency:purge-local-repository

Answer 2

请删除.m2 repository中的文件主要从以下位置删除文件：
C:\Users\{UserName}\.m2\repository\org\apache

再次通过更新POM文件来构建应用程序，问题得到解决。

Answer 3

您必须向文件pom.xml添加依赖项：

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

Answer 4

由于jar文件损坏，我遇到了同样的问题，因此我决定使用最新的spring boot依赖项，并且它的工作原理很好。您只需要更新POM文件并重新构建即可。

<?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>io.javabrains.springbootquickstart</groupId>
<artifactId>course.api</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>

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

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.3.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-web</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>

Answer 5

这差点让我发疯。好吧，请看上面@PhilWebb的评论：

这意味着您的类路径错误（没有Tomcat），或者您有一个属性集会禁用网络支持。

我不得不回到我的Application类，发现我正在这样做：

producer = KafkaProducer(
    bootstrap_servers=get_kafka_brokers(),
    security_protocol='SSL',
    ssl_context=get_kafka_ssl_context(),
    value_serializer=lambda v: json.dumps(v).encode('utf-8'),
    batch_size=0,
    acks=1
)
message = {}
producer.send(app.config['NEW_LOG_TOPIC'], message, key=str(device.id).encode('utf-8'))

我已将while (timer < timeout) { if(in.available() > 0) { byte[] buf = new byte[in.available()]; in.read(buf); if(ByteBuffer.wrap(buf).getDouble() == token) { System.out.println("ALIVE"); return context.transformMessageToString(); } System.out.println("Token not matched"); } timer = System.currentTimeMillis()-start; } System.out.println("NOT ALIVE"); throw e;//timeout try reconect设置为public static void main(String[] args) { new SpringApplicationBuilder(OasisEstoreManagerApiApplication.class) .web(WebApplicationType.NONE) .run(args); }

我将其更改为WebApplicationType并且有效。

这是在我尝试了所有操作之后，包括删除NONE目录。

希望这对某人有帮助。

Spring Boot应用程序Tomcat服务器未运行

5 个答案: