title: Android Studio 3.1.3 Gradle Sync Error. Could Not Download Gradle-Core.jar
body: <p>I am a computer science student and I am attempting to get familiar with building applications for a summertime hobby. However, for the past few days when I try to sync Gradle it gives me the same error stating that </p>
  
  <blockquote>
    <p>gradle-core.jar could not be downloaded.</p>
  </blockquote>
  
  <p>I will post the full error message at the bottom of this post.</p>
  
  <p>Of course, I made sure that I am NOT working in offline mode. On top of that I am forcing <code>https://</code> sources to be fetched using <code>http://</code>. I have also changed the <code>https://</code> for the distributionUrl to http:// in the <code>gradle-wrapper.properties</code> file. I have tried different proxies and have changed the repositories in the <code>build.gradle</code> file to have <code>jcenter(), mavenCentral(), and google().</code></p>
  
  <p>I have even attempted to sync with my firewall and antivirus turned off and nothing is working. Below you will find my entire error message.</p>
  
  <pre><code>org.gradle.api.ProjectConfigurationException: A problem occurred configuring root project 'AndroidStudioProjects'.
  ...
      at org.gradle.configuration.project.LifecycleProjectEvaluator.doConfigure(LifecycleProjectEvaluator.java:64)
      ... 84 more
  Caused by: org.gradle.internal.resolve.ArtifactResolveException: Could not download gradle-core.jar (com.android.tools.build:gradle-core:3.1.3)
      at org.gradle.api.internal.artifacts.repositories.resolver.ExternalResourceResolver$RemoteRepositoryAccess.resolveArtifact(ExternalResourceResolver.java:506)
      at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.CachingModuleComponentRepository$ResolveAndCacheRepositoryAccess.resolveArtifact(CachingModuleComponentRepository.java:409)
      at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.BaseModuleComponentRepositoryAccess.resolveArtifact(BaseModuleComponentRepositoryAccess.java:65)
      at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.memcache.InMemoryCachedModuleComponentRepository$CachedAccess.resolveArtifact(InMemoryCachedModuleComponentRepository.java:124)
      at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.ErrorHandlingModuleComponentRepository$ErrorHandlingModuleComponentRepositoryAccess.resolveArtifact(ErrorHandlingModuleComponentRepository.java:171)
      ...
      ... 6 more
  Caused by: org.gradle.api.resources.ResourceException: Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle-core/3.1.3/gradle-core-3.1.3.jar'.
      at org.gradle.internal.resource.ResourceExceptions.failure(ResourceExceptions.java:74)
      at org.gradle.internal.resource.ResourceExceptions.getFailed(ResourceExceptions.java:57)
      at org.gradle.internal.resource.transfer.AccessorBackedExternalResource.withContentIfPresent(AccessorBackedExternalResource.java:146)
      ...
      at org.gradle.api.internal.artifacts.repositories.resolver.ExternalResourceResolver$RemoteRepositoryAccess.resolveArtifact(ExternalResourceResolver.java:499)
      ... 27 more
  Caused by: javax.net.ssl.SSLException: SSL peer shut down incorrectly
      at sun.security.ssl.InputRecord.readV3Record(InputRecord.java:596)
      at sun.security.ssl.InputRecord.read(InputRecord.java:532)
      at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:983)
      at sun.security.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:940)
      at sun.security.ssl.AppInputStream.read(AppInputStream.java:105)
      at org.apache.http.impl.io.SessionInputBufferImpl.streamRead(SessionInputBufferImpl.java:139)
      at org.apache.http.impl.io.SessionInputBufferImpl.read(SessionInputBufferImpl.java:200)
      ...
      at org.gradle.internal.resource.transfer.AccessorBackedExternalResource.withContentIfPresent(AccessorBackedExternalResource.java:137)
      ... 44 more
  </code></pre>
  
  <p>(EDIT): Below are my relevant files</p>
  
  <p><strong>build.gradle</strong>:</p>
  
  <pre><code>// Top-level build file where you can add configuration options common to all sub-projects/modules.
  
  buildscript {
      ext.kotlin_version = '1.2.30'
      repositories {
          jcenter()
          mavenCentral()
          google()
  
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:3.1.3'
          classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
  
          // NOTE: Do not place your application dependencies here; they belong
          // in the individual module build.gradle files
      }
  }
  
  allprojects {
      repositories {
          jcenter()
          mavenCentral()
          google()
      }
  }
  
  task clean(type: Delete) {
      delete rootProject.buildDir
  }
  </code></pre>
  
  <p><strong>gradle-wrapper.properties</strong>:</p>
  
  <pre><code>#Tue Jun 26 21:50:19 MDT 2018
  distributionBase=GRADLE_USER_HOME
  distributionPath=wrapper/dists
  zipStoreBase=GRADLE_USER_HOME
  zipStorePath=wrapper/dists
  distributionUrl=http\://services.gradle.org/distributions/gradle-4.4-all.zip 
  </code></pre>
  
  <p><strong>gradle.properties</strong>:</p>
  
  <pre><code># Project-wide Gradle settings.
  # IDE (e.g. Android Studio) users:
  # Gradle settings configured through the IDE *will override*
  # any settings specified in this file.
  # For more details on how to configure your build environment visit
  # http://www.gradle.org/docs/current/userguide/build_environment.html
  # Specifies the JVM arguments used for the daemon process.
  # The setting is particularly useful for tweaking memory settings.
  org.gradle.jvmargs=-Xmx1536m
  # When configured, Gradle will run in incubating parallel mode.
  # This option should only be used with decoupled projects. More details, visit
  # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
  # org.gradle.parallel=true
  </code></pre>
  
  <p><strong>settings.gradle</strong>:</p>
  
  <pre><code>include ':app'
  </code></pre>
  
  <p><strong>local.properties</strong>:</p>
  
  <pre><code>## This file is automatically generated by Android Studio.
  # Do not modify this file -- YOUR CHANGES WILL BE ERASED!
  #
  # This file should *NOT* be checked into Version Control Systems,
  # as it contains information specific to your local configuration.
  #
  # Location of the SDK. This is only used by Gradle.
  # For customization when using a Version Control System, please read the
  # header note.
  sdk.dir=C\:\\Users\\jddah\\AppData\\Local\\Android\\Sdk
  </code></pre>