Gradle 找不到插件，使用 Spring 初始化程序初始化的 Spring Boot 项目

Question

使用 Spring initializr 与 gradle 一起初始化一个 spring boot 2.5.0 项目（仅提供 Spring web 作为依赖项）。

gradle build/gradle bootRun 总是失败并出现以下错误：

What went wrong:
Plugin [id: 'org.springframework.boot', version: '2.5.0-SNAPSHOT'] was not found in any of the following sources:

- Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
- Plugin Repositories (could not resolve plugin artifact 'org.springframework.boot:org.springframework.boot.gradle.plugin:2.5.0-SNAPSHOT')
  Searched in the following repositories:
    maven(https://repo.spring.io/milestone)
    maven2(https://repo.spring.io/snapshot)
    Gradle Central Plugin Repository
 

settings.gradle

pluginManagement {
    repositories {
        maven { url 'https://repo.spring.io/milestone' }
        maven { url 'https://repo.spring.io/snapshot' }
        gradlePluginPortal()
    }
}
rootProject.name = 'spring-boot'

build.gradle

plugins {
    id 'org.springframework.boot' version '2.5.0-SNAPSHOT'
    id 'io.spring.dependency-management' version '1.0.11.RELEASE'
    id 'java'
}

group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'

repositories {
    mavenCentral()
    maven { url 'https://repo.spring.io/milestone' }
    maven { url 'https://repo.spring.io/snapshot' }
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-web'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
}

test {
    useJUnitPlatform()
}

运行 Windows 10，gradle 6.8.3，从命令行运行会产生相同的结果。请帮忙。

编辑：可以确认我不在代理后面。还尝试暂时禁用防火墙并运行，但没有运气。

运行 gradle --debug build 导致以下结果

2021-03-26T12:28:35.484+0530 [DEBUG] [org.apache.http.impl.execchain.MainClientExec] Opening connection {s}->https://repo.spring.io:443
2021-03-26T12:28:35.484+0530 [DEBUG] [org.apache.http.impl.conn.DefaultHttpClientConnectionOperator] Connecting to repo.spring.io/35.241.58.96:443
2021-03-26T12:28:35.484+0530 [DEBUG] [org.apache.http.conn.ssl.SSLConnectionSocketFactory] Connecting socket to repo.spring.io/35.241.58.96:443 with timeout 30000
2021-03-26T12:28:35.501+0530 [DEBUG] [org.apache.http.conn.ssl.SSLConnectionSocketFactory] Enabled protocols: [TLSv1.2]
2021-03-26T12:28:35.501+0530 [DEBUG] [org.apache.http.conn.ssl.SSLConnectionSocketFactory] Enabled cipher suites:[TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, TLS_RSA_WITH_AES_128_CBC_SHA256, TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256, TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256, TLS_DHE_RSA_WITH_AES_128_CBC_SHA256, TLS_DHE_DSS_WITH_AES_128_CBC_SHA256, TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, TLS_RSA_WITH_AES_128_CBC_SHA, TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA, TLS_ECDH_RSA_WITH_AES_128_CBC_SHA, TLS_DHE_RSA_WITH_AES_128_CBC_SHA, TLS_DHE_DSS_WITH_AES_128_CBC_SHA, TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, TLS_RSA_WITH_AES_128_GCM_SHA256, TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256, TLS_DHE_RSA_WITH_AES_128_GCM_SHA256, TLS_DHE_DSS_WITH_AES_128_GCM_SHA256, TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
2021-03-26T12:28:35.501+0530 [DEBUG] [org.apache.http.conn.ssl.SSLConnectionSocketFactory] Starting handshake
2021-03-26T12:28:35.519+0530 [DEBUG] [org.apache.http.impl.conn.DefaultManagedHttpClientConnection] http-outgoing-13: Shutdown connection
2021-03-26T12:28:35.520+0530 [DEBUG] [org.apache.http.impl.execchain.MainClientExec] Connection discarded

日志结束说结果成功？

Received result Success[value=org.gradle.launcher.exec.BuildActionResult@1f9ce3e] from daemon DaemonInfo{pid=9948, address=[<some address> port:55586, addresses:[/0.0.0.0]], state=Idle, lastBusy=1616741885172, context=DefaultDaemonContext[uid=<some uid>,javaHome=<my java home>,daemonRegistryDir=<my gradle dir>,pid=9948,idleTimeout=10800000,priority=NORMAL,daemonOpts=-XX:MaxMetaspaceSize=256m,-XX:+HeapDumpOnOutOfMemoryError,-Xms256m,-Xmx512m,-Dfile.encoding=windows-1252,-Duser.country=US,-Duser.language=en,-Duser.variant]} (build should be done).

我认为这可能是 SSL 的问题，但我尝试在 repo 链接上使用 http，但也没有用。

Answer 1

原来问题确实出在 SSL，或者更确切地说是我的 cacerts 文件。

用 buildscript 替换 plugins 块提供了更好的日志记录，包括以下内容：

Caused by: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty

然后我找到了这个帖子：https://github.com/AdoptOpenJDK/openjdk-build/issues/478

总而言之，它说某些 OpenJDK 版本默认情况下没有 cacerts，对于 Windows。果然，我的 cacerts 文件只有 32 个字节长 :)

我已经更新了我的 OpenJDK 版本，现在一切正常。也可以从其他地方导入 cacerts。感谢所有回答问题的人。

话虽如此，如果只有插件块提供更好的调试日志记录，问题就会更快被发现。