Gradle build error in Android Studio 3.0

Question

Can you please help me to resolve the Gradle build issue in Android 3.0 ?

I am new with Android Studio. Here are my configurations in the AS 3.0:

gradle->wrapper->gradle-wrapper.properties:

distributionUrl=https\://services.gradle.org/distributions/gradle-4.2.1-all.zip

build.gradle dependencies (Android Plugin for Gradle):

dependencies {classpath 'com.android.tools.build:gradle:3.0.0'}

Stacktrace from Android Studio:

D:\AppiumAutomation\MobileTest>gradlew assemble --stacktrace

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'MobileTest'.
> Could not resolve all files for configuration ':classpath'.
   > Could not resolve com.android.tools.build:gradle:3.0.0.
     Required by:
         project :
      > Could not resolve com.android.tools.build:gradle:3.0.0.
         > Could not get resource 'https://jcenter.bintray.com/com/android/tools/build/gradle/3.0.0/gradle-3.0.0.pom'.
            > Could not GET 'https://jcenter.bintray.com/com/android/tools/build/gradle/3.0.0/gradle-3.0.0.pom'.
               > sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification pat
h to requested target
      > Could not resolve com.android.tools.build:gradle:3.0.0.
         > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.0.0/gradle-3.0.0.pom'.
            > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.0.0/gradle-3.0.0.pom'.
               > sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification pat
h to requested target

Answer 1

It's a problem related to Android Studio 3.0 and the corporate networks. I had the same problem.

Error:Could not resolve all files for configuration ':app:debugAndroidTestRuntimeClasspath'.
    > Could not resolve com.android.support.test:runner:1.0.1.
      Required by:
          project :app
       > Could not resolve com.android.support.test:runner:1.0.1.
          > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/support/test/runner/1.0.1/runner-1.0.1.pom'.
             > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/support/test/runner/1.0.1/runner-1.0.1.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.support.test.espresso:espresso-core:3.0.1.
      Required by:
          project :app
       > Could not resolve com.android.support.test.espresso:espresso-core:3.0.1.
          > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/support/test/espresso/espresso-core/3.0.1/espresso-core-3.0.1.pom'.
             > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/support/test/espresso/espresso-core/3.0.1/espresso-core-3.0.1.pom'.
                > sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

I leave you 2 solutions:

1rst: You must add certificates manually to your java security certs (used by Android):

C:\Program Files\Android\Android Studio\jre\jre\lib\security\cacerts

SOLUTION 01 (Didn't work for me):

Go to:

C:\Program Files\Android\Android Studio\jre\jre\bin

Download the Certificate you need (just copy the URL with the problem and paste it into <remote_host_name>):

keytool -J-Dhttps.proxyHost=<proxy_hostname> -J-Dhttps.proxyPort=<proxy_port> -printcert -rfc -sslserver <remote_host_name:remote_ssl_port> > <name.cer>

Example:
C:\Program Files\Android\Android Studio\jre\jre\bin>keytool -J-Dhttps.proxyHost= proxy.mycompany.com -J-Dhttps.proxyPort=80 -printcert -rfc -sslserver https://dl.google.com/dl/android/maven2/com/android/support/test/runner/1.0.1/runner-1.0.1.pom > maven2.cer

And run the command:

keytool -import -noprompt -trustcacerts -keystore ..\lib\security\cacerts -importcert -alias <AliasName> -file <name.cer> -storepass <cacertsPassword>

If you never changed the password of cacerts the default one is changeit:

Example:
C:\Program Files\Android\Android Studio\jre\jre\bin>keytool -import -noprompt -trustcacerts -keystore ..\lib\security\cacerts -importcert -alias Maven -file maven2.cer -storepass changeit

SOLUTION 02 (Worked for me):

Download the pom entering to the URL site and store it in your local repo:

Ex:
If your missing resoruce is:
https://dl.google.com/dl/android/maven2/com/android/support/test/espresso/espresso-core/3.0.1/espresso-core-3.0.1.pom

Download it and put it in:
C:/Program Files/Android/Android Studio/gradle/m2repository/com/android/support/test/espresso/espresso-core/3.0.1/espresso-core-3.0.1.pom