[14.4.4] Unable to complete gradle commands

[Matt Allum]

I'm trying to start my first foray into making a Minecraft mod.

 

So far, I have followed guidelines and installed Eclipse (version 2019-09 R 4.13.0), installed the Java SDK (Version 8 update 221, build 1.8.0_221-b11) (downloaded and unzipped the forge-1.14.4-28.1.40-mdk into a folder, and then opened a powershell into that folder and tried to start the gradle commands. At the first stage, gradlew setupDecompWorkspace, I get an error with gradle being unable to get a resource. Stack trace below. Any help here very much appreciated (nb, same error happens with gradlew eclipse, it cannot get the resource for some reason).

 

I've tried turning my AV firewall off during the process, but no difference. For reference, I'm running Windows 10.

 

Begin stack trace:

 

 

To honour the JVM settings for this build a new JVM will be forked. Please consider using the daemon: https://docs.gradle.org/4.9/userguide/gradle_daemon.html.
Daemon will be stopped at the end of the build stopping after processing

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'forge-1.14.4-28.1.40-mdk'.
> Could not resolve all artifacts for configuration ':classpath'.
   > Could not resolve net.minecraftforge.gradle:ForgeGradle:3.+.
     Required by:
         project :
      > Failed to list versions for net.minecraftforge.gradle:ForgeGradle.
         > Unable to load Maven meta-data from https://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGradle/maven-metadata.xml.
            > Could not get resource 'https://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGradle/maven-metadata.xml'.
               > Could not GET 'https://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGradle/maven-metadata.xml'.
                  > 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 --info or --debug option to get more log output. Run with --scan to get full insights.

* Exception is:
org.gradle.api.ProjectConfigurationException: A problem occurred configuring root project 'forge-1.14.4-28.1.40-mdk'.
        at org.gradle.configuration.project.LifecycleProjectEvaluator.wrapException(LifecycleProjectEvaluator.java:79)
        at org.gradle.configuration.project.LifecycleProjectEvaluator.addConfigurationFailure(LifecycleProjectEvaluator.java:73)
        at org.gradle.configuration.project.LifecycleProjectEvaluator.access$400(LifecycleProjectEvaluator.java:54)
        at org.gradle.configuration.project.LifecycleProjectEvaluator$EvaluateProject.run(LifecycleProjectEvaluator.java:107)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:300)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:292)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:174)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.configuration.project.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:68)
        at org.gradle.api.internal.project.DefaultProject.evaluate(DefaultProject.java:682)
        at org.gradle.api.internal.project.DefaultProject.evaluate(DefaultProject.java:138)
        at org.gradle.execution.TaskPathProjectEvaluator.configure(TaskPathProjectEvaluator.java:35)
        at org.gradle.execution.TaskPathProjectEvaluator.configureHierarchy(TaskPathProjectEvaluator.java:60)
        at org.gradle.configuration.DefaultBuildConfigurer.configure(DefaultBuildConfigurer.java:41)
        at org.gradle.initialization.DefaultGradleLauncher$ConfigureBuild.run(DefaultGradleLauncher.java:266)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:300)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:292)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:174)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.initialization.DefaultGradleLauncher.configureBuild(DefaultGradleLauncher.java:179)
        at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:138)
        at org.gradle.initialization.DefaultGradleLauncher.executeTasks(DefaultGradleLauncher.java:121)
        at org.gradle.internal.invocation.GradleBuildController$1.call(GradleBuildController.java:77)
        at org.gradle.internal.invocation.GradleBuildController$1.call(GradleBuildController.java:74)
        at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:152)
        at org.gradle.internal.work.StopShieldingWorkerLeaseService.withLocks(StopShieldingWorkerLeaseService.java:38)
        at org.gradle.internal.invocation.GradleBuildController.doBuild(GradleBuildController.java:96)
        at org.gradle.internal.invocation.GradleBuildController.run(GradleBuildController.java:74)
        at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.java:28)
        at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
        at org.gradle.tooling.internal.provider.ValidatingBuildActionRunner.run(ValidatingBuildActionRunner.java:32)
        at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$3.run(RunAsBuildOperationBuildActionRunner.java:47)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:300)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:292)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:174)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner.run(RunAsBuildOperationBuildActionRunner.java:43)
        at org.gradle.tooling.internal.provider.SubscribableBuildActionRunner.run(SubscribableBuildActionRunner.java:51)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter$1.transform(InProcessBuildActionExecuter.java:50)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter$1.transform(InProcessBuildActionExecuter.java:46)
        at org.gradle.composite.internal.DefaultRootBuildState.run(DefaultRootBuildState.java:74)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:46)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:32)
        at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:39)
        at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:25)
        at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:80)
        at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:53)
        at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:62)
        at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:34)
        at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:36)
        at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:25)
        at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:43)
        at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:29)
        at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:59)
        at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:31)
        at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:59)
        at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:44)
        at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:46)
        at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:30)
        at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:67)
        at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:37)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74)
        at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72)
        at org.gradle.util.Swapper.swap(Swapper.java:38)
        at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.LogAndCheckHealth.execute(LogAndCheckHealth.java:50)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:62)
        at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:82)
        at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50)
        at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:295)
        at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
        at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
        at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
Caused by: org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration$ArtifactResolveException: Could not resolve all artifacts for configuration ':classpath'.
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration.rethrowFailure(DefaultConfiguration.java:1050)
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration.access$1700(DefaultConfiguration.java:125)
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration$ConfigurationArtifactCollection.ensureResolved(DefaultConfiguration.java:1485)
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration$ConfigurationArtifactCollection.getArtifacts(DefaultConfiguration.java:1457)
        at org.gradle.composite.internal.CompositeBuildClassPathInitializer.execute(CompositeBuildClassPathInitializer.java:45)
        at org.gradle.composite.internal.CompositeBuildClassPathInitializer.execute(CompositeBuildClassPathInitializer.java:32)
        at org.gradle.api.internal.initialization.DefaultScriptClassPathResolver.resolveClassPath(DefaultScriptClassPathResolver.java:37)
        at org.gradle.api.internal.initialization.DefaultScriptHandler.getScriptClassPath(DefaultScriptHandler.java:74)
        at org.gradle.plugin.use.internal.DefaultPluginRequestApplicator.defineScriptHandlerClassScope(DefaultPluginRequestApplicator.java:204)
        at org.gradle.plugin.use.internal.DefaultPluginRequestApplicator.applyPlugins(DefaultPluginRequestApplicator.java:82)
        at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.apply(DefaultScriptPluginFactory.java:184)
        at org.gradle.configuration.BuildOperationScriptPlugin$1.run(BuildOperationScriptPlugin.java:61)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:300)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:292)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:174)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.configuration.BuildOperationScriptPlugin.apply(BuildOperationScriptPlugin.java:58)
        at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:41)
        at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:26)
        at org.gradle.configuration.project.ConfigureActionsProjectEvaluator.evaluate(ConfigureActionsProjectEvaluator.java:34)
        at org.gradle.configuration.project.LifecycleProjectEvaluator$EvaluateProject.run(LifecycleProjectEvaluator.java:105)
        ... 85 more
Caused by: org.gradle.internal.resolve.ModuleVersionResolveException: Could not resolve net.minecraftforge.gradle:ForgeGradle:3.+.
Required by:
    project :
        at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.DynamicVersionResolver.resolve(DynamicVersionResolver.java:122)
        at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.RepositoryChainDependencyToComponentIdResolver.resolve(RepositoryChainDependencyToComponentIdResolver.java:72)
        at org.gradle.api.internal.artifacts.ivyservice.resolveengine.ComponentResolversChain$DependencyToComponentIdResolverChain.resolve(ComponentResolversChain.java:150)
        at org.gradle.api.internal.artifacts.ivyservice.resolveengine.graph.builder.SelectorState.resolve(SelectorState.java:170)
        at org.gradle.api.internal.artifacts.ivyservice.resolveengine.graph.selectors.SelectorStateResolver.resolveSelectors(SelectorStateResolver.java:94)
        at org.gradle.api.internal.artifacts.ivyservice.resolveengine.graph.selectors.SelectorStateResolver.selectBest(SelectorStateResolver.java:54)
        at org.gradle.api.internal.artifacts.ivyservice.resolveengine.graph.builder.DependencyGraphBuilder.performSelection(DependencyGraphBuilder.java:223)
        at org.gradle.api.internal.artifacts.ivyservice.resolveengine.graph.builder.DependencyGraphBuilder.performSelectionSerially(DependencyGraphBuilder.java:204)
        at org.gradle.api.internal.artifacts.ivyservice.resolveengine.graph.builder.DependencyGraphBuilder.resolveEdges(DependencyGraphBuilder.java:191)
        at org.gradle.api.internal.artifacts.ivyservice.resolveengine.graph.builder.DependencyGraphBuilder.traverseGraph(DependencyGraphBuilder.java:146)
        at org.gradle.api.internal.artifacts.ivyservice.resolveengine.graph.builder.DependencyGraphBuilder.resolve(DependencyGraphBuilder.java:117)
        at org.gradle.api.internal.artifacts.ivyservice.resolveengine.DefaultArtifactDependencyResolver.resolve(DefaultArtifactDependencyResolver.java:119)
        at org.gradle.api.internal.artifacts.ivyservice.DefaultConfigurationResolver.resolveGraph(DefaultConfigurationResolver.java:167)
        at org.gradle.api.internal.artifacts.ivyservice.ShortCircuitEmptyConfigurationResolver.resolveGraph(ShortCircuitEmptyConfigurationResolver.java:82)
        at org.gradle.api.internal.artifacts.ivyservice.ErrorHandlingConfigurationResolver.resolveGraph(ErrorHandlingConfigurationResolver.java:66)
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration$5.run(DefaultConfiguration.java:534)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:300)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:292)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:174)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration.resolveGraphIfRequired(DefaultConfiguration.java:525)
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration.resolveToStateOrLater(DefaultConfiguration.java:510)
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration.access$1800(DefaultConfiguration.java:125)
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration$ConfigurationFileCollection.getSelectedArtifacts(DefaultConfiguration.java:1033)
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration$ConfigurationFileCollection.access$3100(DefaultConfiguration.java:967)
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration$ConfigurationArtifactCollection.ensureResolved(DefaultConfiguration.java:1479)
        ... 104 more
Caused by: org.gradle.internal.resolve.ModuleVersionResolveException: Failed to list versions for net.minecraftforge.gradle:ForgeGradle.
        at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.ErrorHandlingModuleComponentRepository$ErrorHandlingModuleComponentRepositoryAccess.listModuleVersions(ErrorHandlingModuleComponentRepository.java:126)
        at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.DynamicVersionResolver$VersionListResult.process(DynamicVersionResolver.java:536)
        at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.DynamicVersionResolver$VersionListResult.resolve(DynamicVersionResolver.java:521)
        at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.DynamicVersionResolver$RepositoryResolveState.resolve(DynamicVersionResolver.java:290)
        at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.DynamicVersionResolver.findLatestModule(DynamicVersionResolver.java:177)
        at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.DynamicVersionResolver.findLatestModule(DynamicVersionResolver.java:158)
        at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.DynamicVersionResolver.resolve(DynamicVersionResolver.java:111)
        ... 130 more
Caused by: org.gradle.api.resources.ResourceException: Unable to load Maven meta-data from https://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGradle/maven-metadata.xml.
        at org.gradle.api.internal.artifacts.repositories.maven.MavenMetadataLoader.load(MavenMetadataLoader.java:55)
        at org.gradle.api.internal.artifacts.repositories.maven.MavenVersionLister.listVersions(MavenVersionLister.java:48)
        at org.gradle.api.internal.artifacts.repositories.metadata.DefaultMavenPomMetadataSource.listModuleVersions(DefaultMavenPomMetadataSource.java:73)
        at org.gradle.api.internal.artifacts.repositories.resolver.ExternalResourceResolver.doListModuleVersions(ExternalResourceResolver.java:210)
        at org.gradle.api.internal.artifacts.repositories.resolver.ExternalResourceResolver.access$200(ExternalResourceResolver.java:90)
        at org.gradle.api.internal.artifacts.repositories.resolver.ExternalResourceResolver$RemoteRepositoryAccess.listModuleVersions(ExternalResourceResolver.java:440)
        at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.CachingModuleComponentRepository$ResolveAndCacheRepositoryAccess.listModuleVersions(CachingModuleComponentRepository.java:360)
        at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.ErrorHandlingModuleComponentRepository$ErrorHandlingModuleComponentRepositoryAccess.listModuleVersions(ErrorHandlingModuleComponentRepository.java:121)
        ... 136 more
Caused by: org.gradle.api.resources.ResourceException: Could not get resource 'https://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGradle/maven-metadata.xml'.
        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.DefaultCacheAwareExternalResourceAccessor.copyToCache(DefaultCacheAwareExternalResourceAccessor.java:201)
        at org.gradle.internal.resource.transfer.DefaultCacheAwareExternalResourceAccessor.access$300(DefaultCacheAwareExternalResourceAccessor.java:54)
        at org.gradle.internal.resource.transfer.DefaultCacheAwareExternalResourceAccessor$1.create(DefaultCacheAwareExternalResourceAccessor.java:89)
        at org.gradle.internal.resource.transfer.DefaultCacheAwareExternalResourceAccessor$1.create(DefaultCacheAwareExternalResourceAccessor.java:81)
        at org.gradle.cache.internal.ProducerGuard$AdaptiveProducerGuard.guardByKey(ProducerGuard.java:97)
        at org.gradle.internal.resource.transfer.DefaultCacheAwareExternalResourceAccessor.getResource(DefaultCacheAwareExternalResourceAccessor.java:81)
        at org.gradle.api.internal.artifacts.repositories.maven.MavenMetadataLoader.parseMavenMetadataInfo(MavenMetadataLoader.java:61)
        at org.gradle.api.internal.artifacts.repositories.maven.MavenMetadataLoader.load(MavenMetadataLoader.java:51)
        ... 143 more
Caused by: org.gradle.internal.resource.transport.http.HttpRequestException: Could not GET 'https://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGradle/maven-metadata.xml'.
        at org.gradle.internal.resource.transport.http.HttpClientHelper.performRequest(HttpClientHelper.java:96)
        at org.gradle.internal.resource.transport.http.HttpClientHelper.performRawGet(HttpClientHelper.java:80)
        at org.gradle.internal.resource.transport.http.HttpClientHelper.performGet(HttpClientHelper.java:84)
        at org.gradle.internal.resource.transport.http.HttpResourceAccessor.openResource(HttpResourceAccessor.java:43)
        at org.gradle.internal.resource.transport.http.HttpResourceAccessor.openResource(HttpResourceAccessor.java:29)
        at org.gradle.internal.resource.transfer.DefaultExternalResourceConnector.openResource(DefaultExternalResourceConnector.java:56)
        at org.gradle.internal.resource.transfer.ProgressLoggingExternalResourceAccessor.openResource(ProgressLoggingExternalResourceAccessor.java:37)
        at org.gradle.internal.resource.transfer.AccessorBackedExternalResource.withContentIfPresent(AccessorBackedExternalResource.java:130)
        at org.gradle.internal.resource.BuildOperationFiringExternalResourceDecorator$11.call(BuildOperationFiringExternalResourceDecorator.java:237)
        at org.gradle.internal.resource.BuildOperationFiringExternalResourceDecorator$11.call(BuildOperationFiringExternalResourceDecorator.java:229)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:314)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:304)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:174)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:100)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
        at org.gradle.internal.resource.BuildOperationFiringExternalResourceDecorator.withContentIfPresent(BuildOperationFiringExternalResourceDecorator.java:229)
        at org.gradle.internal.resource.transfer.DefaultCacheAwareExternalResourceAccessor.copyToCache(DefaultCacheAwareExternalResourceAccessor.java:199)
        ... 150 more
Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
        at org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory.java:396)
        at org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:355)
        at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
        at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:373)
        at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:381)
        at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
        at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
        at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
        at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:111)
        at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
        at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
        at org.gradle.internal.resource.transport.http.HttpClientHelper.performHttpRequest(HttpClientHelper.java:148)
        at org.gradle.internal.resource.transport.http.HttpClientHelper.performHttpRequest(HttpClientHelper.java:126)
        at org.gradle.internal.resource.transport.http.HttpClientHelper.executeGetOrHead(HttpClientHelper.java:103)
        at org.gradle.internal.resource.transport.http.HttpClientHelper.performRequest(HttpClientHelper.java:94)
        ... 166 more
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
        ... 181 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
        ... 181 more

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

BUILD FAILED in 6s

[Matt Allum]

34 minutes ago, diesieben07 said:

Forge uses Let's Encrypt for it's files server. Old Java versions do not include these certificates, it seems like you are using an oudated JDK.

OK, so I'm using 8u221, which is the latest JDK 8 version from the Oracle website. Do you, therefore, mean that I should be using Java SE 11 kit or SE 12 kit?

[Matt Allum]

40 minutes ago, diesieben07 said:

The error you showed above should be impossible with 8u221, unless you are victim to a MITM attack, meaning the certificates are actually wrong.

Please verify that Gradle is actually using the correct JDK.

OK, now my simple brain is very confused - I am only trying to use files from the Forge MDK that I downloaded, forge-1.14.4-28.1.40-mdk

 

[Matt Allum]

6 minutes ago, diesieben07 said:

You need some JDK installed. Just the MDK alone won't work.

I installed JDK 8u221 from the Oracle website. Maybe I should just uninstall Java and Eclipse, and then restart from scratch?

[Matt Allum]

28 minutes ago, diesieben07 said:

Again: Please verify that this is actually the JDK used by Gradle.

Sorry, I really do appreciate your response to my thread, so if I've misinterpreted what you were asking, it's my inexperience at fault.

 

I did gradlew -v and got this:

 

------------------------------------------------------------
Gradle 4.9
------------------------------------------------------------

Build time:   2018-07-16 08:14:03 UTC
Revision:     efcf8c1cf533b03c70f394f270f46a174c738efc

Kotlin DSL:   0.18.4
Kotlin:       1.2.41
Groovy:       2.4.12
Ant:          Apache Ant(TM) version 1.9.11 compiled on March 23 2018
JVM:          1.8.0_77 (Oracle Corporation 25.77-b03)
OS:           Windows 10 10.0 amd64

 

 

[Matt Allum]

2 hours ago, diesieben07 said:

There's your issue.

[Matt Allum]

Thanks for the help - after looking at my system, I found an old NVidia Codeworks for Android installation that had installed Gradle and the outdated JDK, so a quick uninstall and restart later, and it looks like everything is going to be ok