运行spring-boot时操作超时错误:run

Question

我正在试着浏览Spring快速入门指南。

我有DemoApplication。Kt文件更新到

package com.example.demo
import org.springframework.boot.SpringApplication
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.web.bind.annotation.GetMapping
import org.springframework.web.bind.annotation.RequestParam
import org.springframework.web.bind.annotation.RestController
@SpringBootApplication
@RestController
class DemoApplication
fun main(args: Array<String>) {
runApplication<DemoApplication>(*args)
}
@GetMapping("/hello")
fun hello(@RequestParam(value = "name", defaultValue = "World") name: String?): String? {
return String.format("Hello %s!", name)
}

当我运行./mvnw spring-boot:run时，Exception in thread "main" java.net.ConnectException: Operation timed out超时。

堆栈跟踪

at java.base/sun.nio.ch.Net.connect(Net.java:579)
at java.base/sun.nio.ch.Net.connect(Net.java:568)
at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:588)
at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:327)
at java.base/java.net.Socket.connect(Socket.java:639)
at java.base/sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:304)
at java.base/sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:174)
at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:183)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:532)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:637)
at java.base/sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:266)
at java.base/sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:380)
at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:193)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1245)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1131)
at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:179)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1668)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1592)
at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:224)
at org.apache.maven.wrapper.DefaultDownloader.downloadInternal(DefaultDownloader.java:106)
at org.apache.maven.wrapper.DefaultDownloader.download(DefaultDownloader.java:93)
at org.apache.maven.wrapper.Installer.createDist(Installer.java:86)
at org.apache.maven.wrapper.WrapperExecutor.execute(WrapperExecutor.java:155)
at org.apache.maven.wrapper.MavenWrapperMain.main(MavenWrapperMain.java:72)

知道我需要做什么不同吗?谢谢。

Answer 1

您编写的Spring应用程序通常不会建立可能失败的出站连接-这就是最初问题的困惑所在。

现在您已经提供了堆栈跟踪，这就更清楚发生了什么。

发生的事情是，你正在使用Maven编译和运行应用程序，Maven需要为你的应用程序更多的工件，所以它会自动为你下载它们org.apache.maven.wrapper.DefaultDownloader.download(....

因此，如果您必须使用代理来访问Internet，那么您需要将这些细节提供给Maven。试试这个指南:https://maven.apache.org/guides/mini/guide-proxies.html