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Duplicate key org.jetbrains.jps.model.module.impl.JpsModuleImpl

my project always was working fine until i opened it today in intelIj and tried to run it i get this error
Error:maven-annotations-test:myapp: java.lang.IllegalStateException: Duplicate key org.jetbrains.jps.model.module.impl.JpsModuleImpl#50eac852
it's not a maven project so i don't get what's causing this

Click on Reimport All Maven Projects - First icon on the left in the image above.
Worked for me!

Related to https://youtrack.jetbrains.com/issue/IDEA-225394 - Internal error: (java.lang.IllegalStateException) Duplicate key
I managed to fix something like this only after closing Intellij and deleting the directory C:\Users\UserName\AppData\Local\JetBrains\IntelliJIdea2020.1
After selecting Run -> Run and running com.appointment.publishing in spring-boot-app the project works fine for the first time.
After modifying the test file on the project and trying to run it more times, it throws the following exception.
After throwing it, the only way to fix it, is going on Build -> Rebuild Project.
However, the problems start happening again if you try to run the project more than one time (after modifying the test file).
Error:Internal error: (java.lang.IllegalStateException) Duplicate key Validate JSPs in 'spring-boot-appointment-publishing:war exploded'
java.lang.IllegalStateException: Duplicate key Validate JSPs in 'spring-boot-appointment-publishing:war exploded'
at java.util.stream.Collectors.lambda$throwingMerger$0(Collectors.java:133)
at java.util.HashMap.merge(HashMap.java:1253)
at java.util.stream.Collectors.lambda$toMap$58(Collectors.java:1320)
at java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
at java.util.Iterator.forEachRemaining(Iterator.java:116)
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
at org.jetbrains.jps.javaee.build.jspValidation.JspValidationTarget$Type.createLoader(JspValidationTarget.java:156)
at org.jetbrains.jps.incremental.storage.BuildTargetTypeState.load(BuildTargetTypeState.java:63)
at org.jetbrains.jps.incremental.storage.BuildTargetTypeState.<init>(BuildTargetTypeState.java:52)
at org.jetbrains.jps.incremental.storage.BuildTargetsState.getTypeState(BuildTargetsState.java:122)
at org.jetbrains.jps.incremental.storage.BuildTargetsState.getAverageBuildTime(BuildTargetsState.java:116)
at org.jetbrains.jps.incremental.IncProjectBuilder.checkRebuildRequired(IncProjectBuilder.java:285)
at org.jetbrains.jps.incremental.IncProjectBuilder.build(IncProjectBuilder.java:167)
at org.jetbrains.jps.cmdline.BuildRunner.runBuild(BuildRunner.java:138)
at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:297)
at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:130)
at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler.lambda$channelRead0$0(BuildMain.java:218)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
IU-201.8538.31, JRE 11.0.7+10-b765.64x64 JetBrains s.r.o., OS Windows 10(amd64) v10.0 , screens 1920x1080
I noticed following error after invoking Build -> Build Project:
Error:Internal error: (java.lang.IllegalStateException) Duplicate key emdms-server (attempted merging values org.jetbrains.jps.model.module.impl.JpsModuleImpl#e8df99a and org.jetbrains.jps.model.module.impl.JpsModuleImpl#64b73e7a)
java.lang.IllegalStateException: Duplicate key emdms-server (attempted merging values org.jetbrains.jps.model.module.impl.JpsModuleImpl#e8df99a and org.jetbrains.jps.model.module.impl.JpsModuleImpl#64b73e7a)
at java.base/java.util.stream.Collectors.duplicateKeyException(Collectors.java:133)
at java.base/java.util.stream.Collectors.lambda$uniqKeysMapAccumulator$1(Collectors.java:180)
at java.base/java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
at java.base/java.util.AbstractList$RandomAccessSpliterator.forEachRemaining(AbstractList.java:720)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
at org.jetbrains.jps.maven.model.impl.MavenAnnotationProcessorTargetType.createLoader(MavenAnnotationProcessorTargetType.java:50)
at org.jetbrains.jps.incremental.storage.BuildTargetTypeState.load(BuildTargetTypeState.java:66)
at org.jetbrains.jps.incremental.storage.BuildTargetTypeState.(BuildTargetTypeState.java:55)
at org.jetbrains.jps.incremental.storage.BuildTargetsState.getTypeState(BuildTargetsState.java:110)
at org.jetbrains.jps.incremental.storage.BuildTargetsState.getAverageBuildTime(BuildTargetsState.java:104)
at org.jetbrains.jps.incremental.messages.BuildProgress.(BuildProgress.java:70)
at org.jetbrains.jps.incremental.IncProjectBuilder.runBuild(IncProjectBuilder.java:365)
at org.jetbrains.jps.incremental.IncProjectBuilder.build(IncProjectBuilder.java:178)
at org.jetbrains.jps.cmdline.BuildRunner.runBuild(BuildRunner.java:139)
at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:288)
at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:121)
at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler.lambda$channelRead0$0(BuildMain.java:228)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
IU-192.6817.14, JRE 11.0.4 10-b304.69x64 JetBrains s.r.o, OS Windows 10(amd64) v10.0 , screens 1920x1080
Update: The exception has disappeared after right click on parent pom.xml -> Maven -> Reimport.
Some times just deleing the IntelliJIdea2020.1 directory was not enough. I had to also delete my C:\Users\UserName\.m2 directory.
#Jet Brains Team: The problem is caused by duplicated artifact configuration files. In order to fix it, you need to delete application_name_war_exploded2.xml and application_name_war2.xml files from .idea/artifacts directory.
Not sure why these duplicating artifacts were produced though. Did you edit artifact configurations manually in File | Project Structure | Artifacts?

I had to right click, hover on Maven and click Download Sources and Documentation
Solved it for me

Deleting the ~/.m2/repository dir and system directory did it for me.
Edit
The issue kept coming up after clearing both the caches. Well, haha, it was so darn trivial to solve: Rebuild project

Grails: Exception with RestBuilder only while running in production tomcat server

I created the war file and deployed into tomcat server but while submitting the registration page(having recaptcha) this error is happening, but not in the local machine and app running in the local machine using the GGTS IDE.
Following is the error happening in the production server
errors.GrailsExceptionResolver - ClassNotFoundException occurred when processing request: [POST] /IFP/signup/completeSignUp
grails.plugins.rest.client.RestBuilder. Stacktrace follows:
java.lang.ClassNotFoundException: grails.plugins.rest.client.RestBuilder
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.getDeclaredMethods(Class.java:1975)
at org.codehaus.groovy.util.LazyReference.getLocked(LazyReference.java:46)
at org.codehaus.groovy.util.LazyReference.get(LazyReference.java:33)
at com.megatome.grails.recaptcha.ReCaptcha.checkAnswer(ReCaptcha.groovy:171)
at com.megatome.grails.RecaptchaService.verifyAnswer(RecaptchaService.groovy:147)
at com.controllers.portal.SignupController.completeSignUp(SignupController.groovy:42)
at grails.plugin.cache.web.filter.PageFragmentCachingFilter.doFilter(PageFragmentCachingFilter.java:198)
at grails.plugin.cache.web.filter.AbstractFilter.doFilter(AbstractFilter.java:63)
at grails.plugin.springsecurity.web.filter.GrailsAnonymousAuthenticationFilter.doFilter(GrailsAnonymousAuthenticationFilter.java:53)
at grails.plugin.springsecurity.web.authentication.RequestHolderAuthenticationFilter.doFilter(RequestHolderAuthenticationFilter.java:53)
at grails.plugin.springsecurity.web.authentication.logout.MutableLogoutFilter.doFilter(MutableLogoutFilter.java:62)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
From my view this exception is happening after the implementation of recaptcha.
Please help me for resolving this issue.

java.lang.ClassNotFoundException: grails.plugins.rest.client.RestBuilder
states clearly that this class is missing in your production war or Tomcat.
Make sure you are setting proper dependencies in your gradle config as per plugin ref-doc:
compile "org.grails.plugins:rest-client-builder:2.1.1"
Check that those jars are also present in your war or Tomcat's classpath

Copying the file grails-datastore-rest-client-3.1.4.RELEASE.jar into the tomcat lib folder resolved the problem.
You can download the jar file from here.

If someone is still looking for the answer: Please add the line below to build.gradle and it should work (pulls in a necessary dependency):
implementation 'org.grails:grails-datastore-rest-client:6.1.9.RELEASE'

Intellij Can't import Gradle Project Because of Proxy

Trying to install a Gradle project into Intellij IDEA 14 and it stays on Resolve dependencies 'classpath' for about 10 minutes before failing. Everything works on the command line.
The error I'm getting is "Malformed reply from SOCKS server". Here is the whole stacktrace from Intellij:
2015-08-26 15:34:00,401 [1859339] WARN nal.AbstractExternalSystemTask - Malformed reply from SOCKS server com.intellij.openapi.externalSystem.model.ExternalSystemException: Malformed reply from SOCKS server
at org.jetbrains.plugins.gradle.service.project.AbstractProjectImportErrorHandler.createUserFriendlyError(AbstractProjectImportErrorHandler.java:106)
at org.jetbrains.plugins.gradle.service.project.BaseProjectImportErrorHandler.getUserFriendlyError(BaseProjectImportErrorHandler.java:158)
at org.jetbrains.plugins.gradle.service.project.BaseGradleProjectResolverExtension.getUserFriendlyError(BaseGradleProjectResolverExtension.java:438)
at org.jetbrains.plugins.gradle.service.project.AbstractProjectResolverExtension.getUserFriendlyError(AbstractProjectResolverExtension.java:164)
at com.android.tools.idea.gradle.project.AndroidGradleProjectResolver.getUserFriendlyError(AndroidGradleProjectResolver.java:322)
at org.jetbrains.plugins.gradle.service.project.AbstractProjectResolverExtension.getUserFriendlyError(AbstractProjectResolverExtension.java:164)
at org.jetbrains.plugins.gradle.service.project.AbstractProjectResolverExtension.getUserFriendlyError(AbstractProjectResolverExtension.java:164)
at org.jetbrains.plugins.gradle.service.project.GradleProjectResolver$ProjectConnectionDataNodeFunction.fun(GradleProjectResolver.java:366)
at org.jetbrains.plugins.gradle.service.project.GradleProjectResolver$ProjectConnectionDataNodeFunction.fun(GradleProjectResolver.java:332)
at org.jetbrains.plugins.gradle.service.project.GradleExecutionHelper.execute(GradleExecutionHelper.java:215)
at org.jetbrains.plugins.gradle.service.project.GradleProjectResolver.resolveProjectInfo(GradleProjectResolver.java:97)
at org.jetbrains.plugins.gradle.service.project.GradleProjectResolver.resolveProjectInfo(GradleProjectResolver.java:65)
at com.intellij.openapi.externalSystem.service.remote.RemoteExternalSystemProjectResolverImpl$1.produce(RemoteExternalSystemProjectResolverImpl.java:41)
at com.intellij.openapi.externalSystem.service.remote.RemoteExternalSystemProjectResolverImpl$1.produce(RemoteExternalSystemProjectResolverImpl.java:37)
at com.intellij.openapi.externalSystem.service.remote.AbstractRemoteExternalSystemService.execute(AbstractRemoteExternalSystemService.java:59)
at com.intellij.openapi.externalSystem.service.remote.RemoteExternalSystemProjectResolverImpl.resolveProjectInfo(RemoteExternalSystemProjectResolverImpl.java:37)
at com.intellij.openapi.externalSystem.service.remote.wrapper.ExternalSystemProjectResolverWrapper.resolveProjectInfo(ExternalSystemProjectResolverWrapper.java:49)
at com.intellij.openapi.externalSystem.service.internal.ExternalSystemResolveProjectTask.doExecute(ExternalSystemResolveProjectTask.java:51)
at com.intellij.openapi.externalSystem.service.internal.AbstractExternalSystemTask.execute(AbstractExternalSystemTask.java:138)
at com.intellij.openapi.externalSystem.service.internal.AbstractExternalSystemTask.execute(AbstractExternalSystemTask.java:124)
at com.intellij.openapi.externalSystem.util.ExternalSystemUtil$4.execute(ExternalSystemUtil.java:540)
at com.intellij.openapi.externalSystem.util.ExternalSystemUtil$5$1.run(ExternalSystemUtil.java:612)
at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:563)
at com.intellij.openapi.progress.impl.CoreProgressManager$8.run(CoreProgressManager.java:367)
at com.intellij.openapi.progress.impl.CoreProgressManager$2.run(CoreProgressManager.java:152)
at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:452)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:402)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:137)
at com.intellij.openapi.application.impl.ApplicationImpl$10$1.run(ApplicationImpl.java:617)
at com.intellij.openapi.application.impl.ApplicationImpl$8.run(ApplicationImpl.java:400)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
at org.jetbrains.ide.PooledThreadExecutor$1$1.run(PooledThreadExecutor.java:56)
To me, that says there is a problem on the proxy wall. But Intellij works fine going through the proxy with other places, like the plugins. I do it by setting java.net.useSystemProxies to `true.
Anyone see this before?

I had a similar error when I left an active SOCKS connection on my system open. Make sure there are no live SOCKS connections like tunnels etc.

What fixed it for me was to upgrade to Intellij IDEA 15. It has much better Gradle support.

JBoss starting with java.io.FileInputStream Error when initializing AbstractKernelController

We have a troublesome JBoss server that recently displayed a new error and refuses to load our web application. No changes have been made to any configuration files - the error just appeared suddenly.
Read all of the JBoss startup,classloader, and bootstrap issues and followed the remedy at: Error starting jboss server but the solutions did not work for us. I apologize for my lack of knowledge and if this is an easy fix. We appreciate the assistance.
Here is the stacktrace:
ERROR [org.jboss.kernel.plugins.dependency.AbstractKernelController] (Thread-2) Error installing to create: name=b81232b8 aliases=[ProfileKey#421c8a02[domain=default, server=default, name=farm])
state=Configured mode=Manual requiredState=Installed: java.lang.RuntimeException: org.jboss.xb.binding.JBossXBException: Failed to parse source: java.io.FileInputStream#4d4352b2
at org.jboss.system.server.profileservice.repository.clustered.local.AbstractContentMetadataPersister.load(AbstractContentMetadataPersister.java:76)
at org.jboss.system.server.profileservice.repository.clustered.local.AbstractLocalContentManager.<init>(AbstractLocalContentManager.java:139)
at org.jboss.system.server.profileservice.repository.clustered.local.file.FilesystemLocalContentManager.<init>(FilesystemLocalContentManager.java:68)
at org.jboss.system.server.profileservice.repository.clustered.local.file.FilesystemLocalContentManagerFactory.getLocalContentManager(FilesystemLocalContentManagerFactory.java:98)
at org.jboss.system.server.profileservice.repository.clustered.ClusteredDeploymentRepository.create(ClusteredDeploymentRepository.java:201)
at org.jboss.system.server.profileservice.repository.clustered.ClusteredDeploymentRepository.load(ClusteredDeploymentRepository.java:242)
at org.jboss.profileservice.repository.legacy.DelegateProfile.create(DelegateProfile.java:138)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccesorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
...

The solution was laughably simple. We cleared the auto-generated jboss/data directory and it fixed everything. Some binding files must have been corrupted and a clean restart had things working again.

NetBeans 8.0 Gradle Plug-in (for LibGDX)

I wanted to start using LibGDX but since they switcher to gradle recently I folowed their guides.
According to those,I installed the plugin Gradle support on NetBeans 8.0 and when I try to open a Gradle Project
I get the error:
Failed to load Gradle Project:test
and when i go to the stacktrace, i get this
Issue 1
Requested project: C:\Users\Halo\Downloads\test
Stack trace:
org.gradle.tooling.GradleConnectionException: Could not run build action using Gradle distribution 'http://services.gradle.org/distributions/gradle-1.10-all.zip'.
at org.gradle.tooling.internal.consumer.ResultHandlerAdapter.onFailure(ResultHandlerAdapter.java:55)
at org.gradle.tooling.internal.consumer.async.DefaultAsyncConsumerActionExecutor$1$1.run(DefaultAsyncConsumerActionExecutor.java:57)
at org.gradle.internal.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:64)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
at org.gradle.tooling.internal.consumer.BlockingResultHandler.getResult(BlockingResultHandler.java:46)
at org.gradle.tooling.internal.consumer.DefaultBuildActionExecuter.run(DefaultBuildActionExecuter.java:43)
at org.netbeans.gradle.model.GenericModelFetcher.getModels(GenericModelFetcher.java:166)
at org.netbeans.gradle.project.model.NbGradle18ModelLoader$ProjectModelFetcher.getModels(NbGradle18ModelLoader.java:374)
at org.netbeans.gradle.project.model.NbGradle18ModelLoader.loadModels(NbGradle18ModelLoader.java:79)
at org.netbeans.gradle.project.model.GradleModelLoader.loadModelWithProgress(GradleModelLoader.java:496)
at org.netbeans.gradle.project.model.GradleModelLoader.access$600(GradleModelLoader.java:57)
at org.netbeans.gradle.project.model.GradleModelLoader$6.run(GradleModelLoader.java:364)
at org.netbeans.gradle.project.tasks.GradleDaemonManager.runNonBlockingGradleTask(GradleDaemonManager.java:24)
at org.netbeans.gradle.project.tasks.GradleDaemonManager.access$100(GradleDaemonManager.java:14)
at org.netbeans.gradle.project.tasks.GradleDaemonManager$2.run(GradleDaemonManager.java:105)
at org.netbeans.gradle.project.tasks.GradleDaemonManager$3.run(GradleDaemonManager.java:130)
at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)
Caused by: org.gradle.api.GradleException: Unable to start the daemon process.
This problem might be caused by incorrect configuration of the daemon.
For example, an unrecognized jvm option is used.
Please refer to the user guide chapter on the daemon at http://gradle.org/docs/1.10/userguide/gradle_daemon.html
Please read below process output to find out more:
-----------------------
at org.gradle.launcher.daemon.bootstrap.DaemonGreeter.parseDaemonOutput(DaemonGreeter.java:34)
at org.gradle.launcher.daemon.client.DefaultDaemonStarter.startProcess(DefaultDaemonStarter.java:109)
at org.gradle.launcher.daemon.client.DefaultDaemonStarter.startDaemon(DefaultDaemonStarter.java:90)
at org.gradle.launcher.daemon.client.DefaultDaemonConnector.startDaemon(DefaultDaemonConnector.java:95)
at org.gradle.launcher.daemon.client.DefaultDaemonConnector.connect(DefaultDaemonConnector.java:72)
at org.gradle.launcher.daemon.client.DaemonClient.execute(DaemonClient.java:149)
at org.gradle.launcher.daemon.client.DaemonClient.execute(DaemonClient.java:74)
at org.gradle.tooling.internal.provider.DaemonBuildActionExecuter.execute(DaemonBuildActionExecuter.java:42)
at org.gradle.tooling.internal.provider.DaemonBuildActionExecuter.execute(DaemonBuildActionExecuter.java:29)
at org.gradle.tooling.internal.provider.LoggingBridgingBuildActionExecuter.execute(LoggingBridgingBuildActionExecuter.java:53)
at org.gradle.tooling.internal.provider.LoggingBridgingBuildActionExecuter.execute(LoggingBridgingBuildActionExecuter.java:30)
at org.gradle.tooling.internal.provider.ProviderConnection.run(ProviderConnection.java:106)
at org.gradle.tooling.internal.provider.ProviderConnection.run(ProviderConnection.java:100)
at org.gradle.tooling.internal.provider.DefaultConnection.run(DefaultConnection.java:143)
at org.gradle.tooling.internal.consumer.connection.ActionAwareConsumerConnection.run(ActionAwareConsumerConnection.java:40)
at org.gradle.tooling.internal.consumer.DefaultBuildActionExecuter$1.run(DefaultBuildActionExecuter.java:53)
at org.gradle.tooling.internal.consumer.connection.LazyConsumerActionExecutor.run(LazyConsumerActionExecutor.java:82)
at org.gradle.tooling.internal.consumer.connection.ProgressLoggingConsumerActionExecutor.run(ProgressLoggingConsumerActionExecutor.java:58)
at org.gradle.tooling.internal.consumer.connection.LoggingInitializerConsumerActionExecutor.run(LoggingInitializerConsumerActionExecutor.java:44)
at org.gradle.tooling.internal.consumer.async.DefaultAsyncConsumerActionExecutor$1$1.run(DefaultAsyncConsumerActionExecutor.java:55)
at org.gradle.internal.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:64)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
In the code it says that it's caused by Daemon, can someone explain to me how to fix it? it's really torturing my head and I'm about to give the finger to LibGDX and smash my pc into smitherings.
I'll add that I've tried to use the gradlew inside the folder of the project that LibGDX has built (using cmd) but i've got no clue to what to do and, apart for the Gradle support plug-in i've got nothing else about gradle on my pc

I had same problem, turned out to be a proxy problem. Gradle does not see your proxy setting and you have to add them manually to the gradle.properties file in the project.
It then donwloads all relevant jar files when you build the project.
Used this page setup : http://www.gradle.org/docs/current/userguide/build_environment.html