title: Gradle: No trusted certificate found
body: <p>i'm trying to build my Android-Project on Ubuntu-Server using Gradle.</p>
  
  <p>Building with Android-Studio on my Windows 10 PC works fine</p>
  
  <p>but using <code>./gradlew build</code> or  <code>./gradlew clean</code> fails with following output:</p>
  
  <pre><code>FAILURE: Build failed with an exception.
  
  * What went wrong:
  A problem occurred configuring root project 'workspace'.
  &gt; Could not resolve all dependencies for configuration ':classpath'.
     &gt; Could not download gradle-core.jar (com.android.tools.build:gradle-core:2.2.3)
        &gt; Could not get resource     'https://jcenter.bintray.com/com/android/tools/build/gradle-core/2.2.3/gradle-core-2.2.3.jar'.
           &gt; Could not GET 'https://jcenter.bintray.com/com/android/tools/build/gradle-core/2.2.3/gradle-core-2.2.3.jar'.
              &gt; sun.security.validator.ValidatorException: No trusted certificate found
  </code></pre>
  
  <p>During my research I only found two similar questions and both answers didn't work out for me:</p>
  
  <blockquote>
    <p><a href="https://stackoverflow.com/a/30924895/7363909">Paul Lammertsma - gradlew.bat (and gradlew) SSLHandShakeException</a></p>
    
    <blockquote>
  <pre><code>sudo dpkg --purge --force-depends ca-certificates-java
  sudo apt-get install ca-certificates-java
  </code></pre>
    </blockquote>
  </blockquote>
  
  <p>and this one had very similar error but no real solution:</p>
  
  <blockquote>
    <p><a href="https://stackoverflow.com/q/39335255">user119469 - imported project - Gradle Sync error no trusted certificate found</a></p>
    
    <blockquote>
  <pre><code>Error:A problem occurred configuring root project 'app'.
     &gt; Could not resolve all dependencies for configuration ':classpath'.
        &gt; Could not download javassist.jar (org.javassist:javassist:3.20.0-GA)
           &gt; Could not get resource 'https://jcenter.bintray.com/org/javassist/javassist/3.20.0-GA/javassist-3.20.0-GA.jar'.
              &gt; Could not GET 'https://jcenter.bintray.com/org/javassist/javassist/3.20.0-GA/javassist-3.20.0-GA.jar'.
                 &gt; sun.security.validator.ValidatorException: No trusted certificate found
  </code></pre>
    </blockquote>
  </blockquote>
  
  <p>running <code>./gradlew clean --stacktrace</code> returns:</p>
  
  <pre><code>* Exception is:
  org.gradle.api.ProjectConfigurationException: A problem occurred configuring root project 'workspace'.
          at org.gradle.configuration.project.LifecycleProjectEvaluator.addConfigurationFailure(LifecycleProjectEvaluator.java:79)
          at org.gradle.configuration.project.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:57)
          at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:540)
          at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:93)
          at org.gradle.execution.TaskPathProjectEvaluator.configureHierarchy(TaskPathProjectEvaluator.java:42)
          at org.gradle.configuration.DefaultBuildConfigurer.configure(DefaultBuildConfigurer.java:35)
          at org.gradle.initialization.DefaultGradleLauncher$2.run(DefaultGradleLauncher.java:124)
          at org.gradle.internal.Factories$1.create(Factories.java:22)
          at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
          at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:53)
          at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:121)
          at org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:32)
          at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:98)
          at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:92)
          at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
          at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:63)
          at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:92)
          at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:83)
          at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:99)
          at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.java:28)
          at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
          at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:48)
          at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:30)
          at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:81)
          at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:46)
          at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java:51)
          at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java:28)
          at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:43)
          at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:173)
          at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:239)
          at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:212)
          at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:35)
          at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:24)
          at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
          at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
          at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:205)
          at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:169)
          at org.gradle.launcher.Main.doAction(Main.java:33)
          at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
          at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:55)
          at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:36)
          at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
          at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:33)
          at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:130)
          at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:48)
  Caused by: org.gradle.api.artifacts.ResolveException: Could not resolve all dependencies for configuration ':classpath'.
          at org.gradle.api.internal.artifacts.ivyservice.ErrorHandlingConfigurationResolver.wrapException(ErrorHandlingConfigurationResolver.java:70)
          at org.gradle.api.internal.artifacts.ivyservice.ErrorHandlingConfigurationResolver.access$000(ErrorHandlingConfigurationResolver.java:33)
          at org.gradle.api.internal.artifacts.ivyservice.ErrorHandlingConfigurationResolver$ErrorHandlingResolvedConfiguration.getFiles(ErrorHandlingConfigurationResolver.java:199)
          at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration$ConfigurationFileCollection.getFiles(DefaultConfiguration.java:671)
          at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration.getFiles(DefaultConfiguration.java:293)
          at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration_Decorated.getFiles(Unknown Source)
          at org.gradle.api.internal.initialization.DefaultScriptHandler.getScriptClassPath(DefaultScriptHandler.java:69)
          at org.gradle.plugin.use.internal.DefaultPluginRequestApplicator.defineScriptHandlerClassScope(DefaultPluginRequestApplicator.java:186)
          at org.gradle.plugin.use.internal.DefaultPluginRequestApplicator.applyPlugins(DefaultPluginRequestApplicator.java:75)
          at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.apply(DefaultScriptPluginFactory.java:157)
          at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:38)
          at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:25)
          at org.gradle.configuration.project.ConfigureActionsProjectEvaluator.evaluate(ConfigureActionsProjectEvaluator.java:34)
          at org.gradle.configuration.project.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:55)
          ... 43 more
  Caused by: org.gradle.internal.resolve.ArtifactResolveException: Could not download gradle-core.jar (com.android.tools.build:gradle-core:2.2.3)
          at org.gradle.api.internal.artifacts.repositories.resolver.ExternalResourceResolver.resolveArtifact(ExternalResourceResolver.java:240)
          at org.gradle.api.internal.artifacts.repositories.resolver.ExternalResourceResolver$RemoteRepositoryAccess.resolveArtifact(ExternalResourceResolver.java:436)
          at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.CacheLockReleasingModuleComponentsRepository$LockReleasingRepositoryAccess$5.run(CacheLockReleasingModuleComponentsRepository.java:96)
          at org.gradle.internal.Factories$1.create(Factories.java:22)
          at org.gradle.cache.internal.DefaultCacheAccess.longRunningOperation(DefaultCacheAccess.java:242)
          at org.gradle.cache.internal.DefaultCacheAccess.longRunningOperation(DefaultCacheAccess.java:313)
          at org.gradle.cache.internal.DefaultPersistentDirectoryStore.longRunningOperation(DefaultPersistentDirectoryStore.java:114)
          at org.gradle.cache.internal.DefaultCacheFactory$ReferenceTrackingCache.longRunningOperation(DefaultCacheFactory.java:179)
          at org.gradle.api.internal.artifacts.ivyservice.DefaultCacheLockingManager.longRunningOperation(DefaultCacheLockingManager.java:56)
          at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.CacheLockReleasingModuleComponentsRepository$LockReleasingRepositoryAccess.resolveArtifact(CacheLockReleasingModuleComponentsRepository.java:94)
          at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.CachingModuleComponentRepository$ResolveAndCacheRepositoryAccess.resolveArtifact(CachingModuleComponentRepository.java:342)
          at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.BaseModuleComponentRepositoryAccess.resolveArtifact(BaseModuleComponentRepositoryAccess.java:54)
          at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.memcache.InMemoryCachedModuleComponentRepository$CachedAccess.resolveArtifact(InMemoryCachedModuleComponentRepository.java:82)
          at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.ErrorHandlingModuleComponentRepository$ErrorHandlingModuleComponentRepositoryAccess.resolveArtifact(ErrorHandlingModuleComponentRepository.java:116)
          at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.RepositoryChainArtifactResolver.resolveArtifact(RepositoryChainArtifactResolver.java:65)
          at org.gradle.api.internal.artifacts.ivyservice.resolveengine.ComponentResolversChain$ArtifactResolverChain.resolveArtifact(ComponentResolversChain.java:98)
          at org.gradle.api.internal.artifacts.ivyservice.ContextualArtifactResolver$3.execute(ContextualArtifactResolver.java:61)
          at org.gradle.api.internal.artifacts.ivyservice.ContextualArtifactResolver$3.execute(ContextualArtifactResolver.java:59)
          at org.gradle.internal.Transformers$4.transform(Transformers.java:169)
          at org.gradle.api.internal.artifacts.ivyservice.DefaultIvyContextManager.withIvy(DefaultIvyContextManager.java:61)
          at org.gradle.api.internal.artifacts.ivyservice.DefaultIvyContextManager.withIvy(DefaultIvyContextManager.java:39)
          at org.gradle.api.internal.artifacts.ivyservice.ContextualArtifactResolver$4.run(ContextualArtifactResolver.java:69)
          at org.gradle.internal.Factories$1.create(Factories.java:22)
          at org.gradle.cache.internal.DefaultCacheAccess.useCache(DefaultCacheAccess.java:192)
          at org.gradle.cache.internal.DefaultCacheAccess.useCache(DefaultCacheAccess.java:175)
          at org.gradle.cache.internal.DefaultPersistentDirectoryStore.useCache(DefaultPersistentDirectoryStore.java:106)
          at org.gradle.cache.internal.DefaultCacheFactory$ReferenceTrackingCache.useCache(DefaultCacheFactory.java:187)
          at org.gradle.api.internal.artifacts.ivyservice.DefaultCacheLockingManager.useCache(DefaultCacheLockingManager.java:64)
          at org.gradle.api.internal.artifacts.ivyservice.ContextualArtifactResolver.executeInContext(ContextualArtifactResolver.java:67)
          at org.gradle.api.internal.artifacts.ivyservice.ContextualArtifactResolver.resolveArtifact(ContextualArtifactResolver.java:59)
          at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.ErrorHandlingArtifactResolver.resolveArtifact(ErrorHandlingArtifactResolver.java:53)
          at org.gradle.api.internal.artifacts.ivyservice.resolveengine.artifact.DefaultArtifactSet$LazyArtifactSource.create(DefaultArtifactSet.java:93)
          at org.gradle.api.internal.artifacts.ivyservice.resolveengine.artifact.DefaultArtifactSet$LazyArtifactSource.create(DefaultArtifactSet.java:80)
          at org.gradle.api.internal.artifacts.DefaultResolvedArtifact.getFile(DefaultResolvedArtifact.java:90)
          at org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration$2.run(DefaultLenientConfiguration.java:122)
          at org.gradle.internal.Factories$1.create(Factories.java:22)
          at org.gradle.cache.internal.DefaultCacheAccess.useCache(DefaultCacheAccess.java:192)
          at org.gradle.cache.internal.DefaultCacheAccess.useCache(DefaultCacheAccess.java:175)
          at org.gradle.cache.internal.DefaultPersistentDirectoryStore.useCache(DefaultPersistentDirectoryStore.java:106)
          at org.gradle.cache.internal.DefaultCacheFactory$ReferenceTrackingCache.useCache(DefaultCacheFactory.java:187)
          at org.gradle.api.internal.artifacts.ivyservice.DefaultCacheLockingManager.useCache(DefaultCacheLockingManager.java:64)
          at org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration.getFiles(DefaultLenientConfiguration.java:119)
          at org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration.getFilesStrict(DefaultLenientConfiguration.java:91)
          at org.gradle.api.internal.artifacts.ivyservice.DefaultResolvedConfiguration.getFiles(DefaultResolvedConfiguration.java:45)
          at org.gradle.api.internal.artifacts.ivyservice.SelfResolvingDependencyConfigurationResolver$FilesAggregatingResolvedConfiguration.getFiles(SelfResolvingDependencyConfigurationResolver.java:87)
          at org.gradle.api.internal.artifacts.ivyservice.ErrorHandlingConfigurationResolver$ErrorHandlingResolvedConfiguration.getFiles(ErrorHandlingConfigurationResolver.java:197)
          ... 54 more
  Caused by: org.gradle.api.resources.ResourceException: Could not get resource 'https://jcenter.bintray.com/com/android/tools/build/gradle-core/2.2.3/gradle-core-2.2.3.jar'.
          at org.gradle.internal.resource.ResourceExceptions.failure(ResourceExceptions.java:69)
          at org.gradle.internal.resource.ResourceExceptions.getFailed(ResourceExceptions.java:52)
          at org.gradle.api.internal.artifacts.repositories.resolver.DefaultExternalResourceArtifactResolver.downloadStaticResource(DefaultExternalResourceArtifactResolver.java:95)
          at org.gradle.api.internal.artifacts.repositories.resolver.DefaultExternalResourceArtifactResolver.resolveArtifact(DefaultExternalResourceArtifactResolver.java:56)
          at org.gradle.api.internal.artifacts.repositories.resolver.ExternalResourceResolver.download(ExternalResourceResolver.java:252)
          at org.gradle.api.internal.artifacts.repositories.resolver.ExternalResourceResolver.resolveArtifact(ExternalResourceResolver.java:238)
          ... 99 more
  Caused by: org.gradle.internal.resource.transport.http.HttpRequestException: Could not GET 'https://jcenter.bintray.com/com/android/tools/build/gradle-core/2.2.3/gradle-core-2.2.3.jar'.
          at org.gradle.internal.resource.transport.http.HttpClientHelper.performRequest(HttpClientHelper.java:72)
          at org.gradle.internal.resource.transport.http.HttpClientHelper.performRawGet(HttpClientHelper.java:58)
          at org.gradle.internal.resource.transport.http.HttpClientHelper.performGet(HttpClientHelper.java:62)
          at org.gradle.internal.resource.transport.http.HttpResourceAccessor.openResource(HttpResourceAccessor.java:51)
          at org.gradle.internal.resource.transport.http.HttpResourceAccessor.openResource(HttpResourceAccessor.java:34)
          at org.gradle.internal.resource.transfer.DefaultExternalResourceConnector.openResource(DefaultExternalResourceConnector.java:56)
          at org.gradle.internal.resource.transfer.ProgressLoggingExternalResourceAccessor.openResource(ProgressLoggingExternalResourceAccessor.java:36)
          at org.gradle.internal.resource.transport.DefaultExternalResourceRepository.getResource(DefaultExternalResourceRepository.java:63)
          at org.gradle.internal.resource.transfer.DefaultCacheAwareExternalResourceAccessor.getResource(DefaultCacheAwareExternalResourceAccessor.java:76)
          at org.gradle.api.internal.artifacts.repositories.resolver.DefaultExternalResourceArtifactResolver.downloadStaticResource(DefaultExternalResourceArtifactResolver.java:86)
          ... 102 more
  Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: No trusted certificate found
          at org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory.java:394)
          at org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:353)
          at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:134)
          at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:353)
          at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:380)
          at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)
          at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)
          at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)
          at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
          at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
          at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
          at org.gradle.internal.resource.transport.http.HttpClientHelper.performHttpRequest(HttpClientHelper.java:102)
          at org.gradle.internal.resource.transport.http.HttpClientHelper.executeGetOrHead(HttpClientHelper.java:79)
          at org.gradle.internal.resource.transport.http.HttpClientHelper.performRequest(HttpClientHelper.java:70)
          ... 111 more
  Caused by: sun.security.validator.ValidatorException: No trusted certificate found
          ... 125 more
  </code></pre>
  
  <p>Output of <code>./gradlew --version</code>:</p>
  
  <pre><code>------------------------------------------------------------
  Gradle 2.14.1
  ------------------------------------------------------------
  
  Build time:   2016-07-18 06:38:37 UTC
  Revision:     d9e2113d9fb05a5caabba61798bdb8dfdca83719
  
  Groovy:       2.4.4
  Ant:          Apache Ant(TM) version 1.9.6 compiled on June 29 2015
  JVM:          9-internal (Oracle Corporation 9-internal+0-2016-04-14-195246.buildd.src)
  OS:           Linux 4.4.0-31-generic amd64
  </code></pre>
  
  <p>Output of <code>java -version</code>:</p>
  
  <pre><code>openjdk version "9-internal"
  OpenJDK Runtime Environment (build 9-internal+0-2016-04-14-195246.buildd.src)
  OpenJDK 64-Bit Server VM (build 9-internal+0-2016-04-14-195246.buildd.src, mixed mode)
  </code></pre>
  
  <p>Thanks in advance</p>
  
  <p>OBit</p>