android - gradle-4.8构建失败，出现异常，无法获取互联网资源

Question

将操作系统更改为Ubuntu-18.04并升级到v4.8后，我无法构建android项目。

作为比较，我可以使用gradle-v3.4.1在Ubuntu-14.04上构建该项目。

有一些错误信息。

Gradle构建失败，如下所示:

user@Ubuntu1804 ~/android/im/ocelot $ gradle build

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'ocelot'.
> Could not resolve all artifacts for configuration ':classpath'.
   > Could not resolve com.android.tools.build:gradle:3.1.2.
     Required by:
         project :
      > Could not resolve com.android.tools.build:gradle:3.1.2.
         > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom'.
            > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom'.
               > sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
      > Could not resolve com.android.tools.build:gradle:3.1.2.
         > Could not get resource 'https://jcenter.bintray.com/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom'.
            > Could not GET 'https://jcenter.bintray.com/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom'.
               > sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s

这是build.gradle:

user@Ubuntu1804 ~/android/im/ocelot $ cat build.gradle 
// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.2'


        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

这是gradle版本:

user@Ubuntu1804 ~/android/im/ocelot $ gradle -version

------------------------------------------------------------
Gradle 4.8
------------------------------------------------------------

Build time:   2018-06-04 10:39:58 UTC
Revision:     9e1261240e412cbf61a5e3a5ab734f232b2f887d

Groovy:       2.4.12
Ant:          Apache Ant(TM) version 1.9.11 compiled on March 23 2018
JVM:          1.8.0_171 (Oracle Corporation 25.171-b11)
OS:           Linux 4.15.0-23-generic amd64

OpenJDK-1.8.0:

user@Ubuntu1804 ~/android/im/ocelot $ java -version
openjdk version "1.8.0_171"
OpenJDK Runtime Environment (build 1.8.0_171-8u171-b11-0ubuntu0.18.04.1-b11)
OpenJDK 64-Bit Server VM (build 25.171-b11, mixed mode)

我已经导入了一些证书，并对其进行了如下验证:

user@Ubuntu1804 ~/android/im/ocelot $ keytool -list -keystore $JAVA_HOME/jre/lib/security/cacerts | grep google
Enter keystore password:  changeit
google.com, Jun 21, 2018, trustedCertEntry, 
debian:googlecom.pem, Jun 21, 2018, trustedCertEntry, 
dl.google.com, Jun 21, 2018, trustedCertEntry, 
maven.google.com, Jun 21, 2018, trustedCertEntry, 

user@Ubuntu1804 ~/android/im/ocelot $ keytool -list -keystore $JAVA_HOME/jre/lib/security/cacerts | grep bintray
Enter keystore password:  changeit
jcenter.bintray.com, Jun 21, 2018, trustedCertEntry,

我做了一些测试来验证互联网连接，因为有一个HTTPS_PROXY:

user@Ubuntu1804 ~/android/im/ocelot $ wget https://maven.google.com/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom
--2018-06-21 22:21:27--  https://maven.google.com/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom
Resolving proxy.COMPANY.net (proxy.COMPANY.net)... 10.x.x.x
Connecting to proxy.COMPANY.net (proxy.COMPANY.net)|10.x.x.x|:8080... connected.
Proxy request sent, awaiting response... 301 Moved Permanently
Location: https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom [following]
--2018-06-21 22:21:28--  https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom
Connecting to proxy.COMPANY.net (proxy.COMPANY.net)|10.x.x.x|:8080... connected.
Proxy request sent, awaiting response... 200 OK
Length: 2391 (2.3K) [application/octet-stream]
Saving to: ‘gradle-3.1.2.pom.1’

gradle-3.1.2.pom.1             100%[====================================================>]   2.33K  --.-KB/s    in 0s      

2018-06-21 22:21:29 (17.1 MB/s) - ‘gradle-3.1.2.pom.1’ saved [2391/2391]

user@Ubuntu1804 ~/android/im/ocelot $ curl https://maven.google.com/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom
curl: (35) error:1408F10B:SSL routines:ssl3_get_record:wrong version number

Answer 1

这很可能是truststore问题。

尝试使用以下命令运行构建:./gradlew --no-daemon -Djavax.net.debug=ssl:handshake:verbose build
并通过查找truststore行来检查加载了adding as trusted cert:及其包含的证书。