The IntelliJ plugin fails to load languages on OSX, probably due to a URI encoding bug. This is the stracktrace that is produced when opening a language specification project that uses ESV:

org.apache.commons.vfs2.FileSystemException: Could not replicate "file:///Users/gohla/Library/Application%252520Support/IdeaIC15/org.metaborg.intellij/classes/languages/org.metaborg.meta.lang.esv-2.0.0-SNAPSHOT.spoofax-language" as it does not exist.
org.metaborg.core.MetaborgRuntimeException: org.apache.commons.vfs2.FileSystemException: Could not replicate "file:///Users/gohla/Library/Application%252520Support/IdeaIC15/org.metaborg.intellij/classes/languages/org.metaborg.meta.lang.esv-2.0.0-SNAPSHOT.spoofax-language" as it does not exist.
	at org.metaborg.core.resource.ResourceService.resolve(ResourceService.java:81)
	at org.metaborg.intellij.discovery.ResourceLanguageSource.find(ResourceLanguageSource.java:64)
	at org.metaborg.intellij.discovery.MultiLanguageSource.find(MultiLanguageSource.java:60)
	at org.metaborg.intellij.languages.DefaultLanguageManager.discover(DefaultLanguageManager.java:81)
	at org.metaborg.intellij.languages.DefaultLanguageManager.discoverRange(DefaultLanguageManager.java:144)
	at org.metaborg.intellij.idea.configuration.ConfigurationUtils.loadAndActivateLanguagesInternal(ConfigurationUtils.java:73)
	at org.metaborg.intellij.idea.configuration.ConfigurationUtils.lambda$loadAndActivateLanguages$10(ConfigurationUtils.java:55)
	at org.metaborg.intellij.idea.configuration.ConfigurationUtils$$Lambda$4/1203396144.run(Unknown Source)
	at com.intellij.openapi.command.WriteCommandAction$4.run(WriteCommandAction.java:181)
	at com.intellij.openapi.command.WriteCommandAction$Simple.run(WriteCommandAction.java:166)
	at com.intellij.openapi.application.RunResult.run(RunResult.java:35)
	at com.intellij.openapi.command.WriteCommandAction$2$1.run(WriteCommandAction.java:114)
	at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1010)
	at com.intellij.openapi.command.WriteCommandAction$2.run(WriteCommandAction.java:111)
	at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:124)
	at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:99)
	at com.intellij.openapi.command.WriteCommandAction.performWriteCommandAction(WriteCommandAction.java:108)
	at com.intellij.openapi.command.WriteCommandAction.execute(WriteCommandAction.java:80)
	at com.intellij.openapi.command.WriteCommandAction.runWriteCommandAction(WriteCommandAction.java:183)
	at com.intellij.openapi.command.WriteCommandAction.runWriteCommandAction(WriteCommandAction.java:173)
	at org.metaborg.intellij.idea.configuration.ConfigurationUtils.loadAndActivateLanguages(ConfigurationUtils.java:54)
	at org.metaborg.intellij.idea.IdeaModuleComponent.projectOpened(IdeaModuleComponent.java:110)
	at com.intellij.openapi.module.impl.ModuleImpl.projectOpened(ModuleImpl.java:170)
	at com.intellij.openapi.module.impl.ModuleManagerImpl$ModuleModelImpl.projectOpened(ModuleManagerImpl.java:905)
	at com.intellij.openapi.module.impl.ModuleManagerImpl.projectOpened(ModuleManagerImpl.java:585)
	at com.intellij.openapi.project.impl.ProjectImpl.projectOpened(ProjectImpl.java:400)
	at com.intellij.openapi.project.impl.ProjectImpl.access$200(ProjectImpl.java:63)
	at com.intellij.openapi.project.impl.ProjectImpl$MyProjectManagerListener.projectOpened(ProjectImpl.java:434)
	at com.intellij.openapi.project.impl.ProjectManagerImpl$1.projectOpened(ProjectManagerImpl.java:98)
	at com.intellij.openapi.project.impl.ProjectManagerImpl.fireProjectOpened(ProjectManagerImpl.java:721)
	at com.intellij.openapi.project.impl.ProjectManagerImpl.openProject(ProjectManagerImpl.java:352)
	at com.intellij.openapi.project.impl.ProjectManagerImpl.loadAndOpenProject(ProjectManagerImpl.java:467)
	at com.intellij.ide.impl.ProjectUtil.openProject(ProjectUtil.java:182)
	at com.intellij.ide.RecentProjectsManagerImpl.doOpenProject(RecentProjectsManagerImpl.java:46)
	at com.intellij.ide.RecentProjectsManagerBase.doReopenLastProject(RecentProjectsManagerBase.java:554)
	at com.intellij.ide.RecentProjectsManagerBase$MyAppLifecycleListener.appStarting(RecentProjectsManagerBase.java:588)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at com.intellij.util.messages.impl.MessageBusConnectionImpl.deliverMessage(MessageBusConnectionImpl.java:116)
	at com.intellij.util.messages.impl.MessageBusImpl.doPumpMessages(MessageBusImpl.java:368)
	at com.intellij.util.messages.impl.MessageBusImpl.pumpMessages(MessageBusImpl.java:355)
	at com.intellij.util.messages.impl.MessageBusImpl.sendMessage(MessageBusImpl.java:334)
	at com.intellij.util.messages.impl.MessageBusImpl.access$200(MessageBusImpl.java:42)
	at com.intellij.util.messages.impl.MessageBusImpl$2.invoke(MessageBusImpl.java:223)
	at com.sun.proxy.$Proxy68.appStarting(Unknown Source)
	at com.intellij.idea.IdeaApplication$IdeStarter$2.run(IdeaApplication.java:354)
	at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.runNextEvent(LaterInvocator.java:337)
	at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:321)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:744)
	at java.awt.EventQueue.access$400(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:697)
	at java.awt.EventQueue$3.run(EventQueue.java:691)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:714)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:866)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:654)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:381)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: org.apache.commons.vfs2.FileSystemException: Could not replicate "file:///Users/gohla/Library/Application%252520Support/IdeaIC15/org.metaborg.intellij/classes/languages/org.metaborg.meta.lang.esv-2.0.0-SNAPSHOT.spoofax-language" as it does not exist.
	at org.apache.commons.vfs2.provider.AbstractFileSystem.replicateFile(AbstractFileSystem.java:418)
	at org.apache.commons.vfs2.provider.zip.ZipFileSystem.<init>(ZipFileSystem.java:61)
	at org.apache.commons.vfs2.provider.zip.ZipFileProvider.doCreateFileSystem(ZipFileProvider.java:76)
	at org.apache.commons.vfs2.provider.AbstractLayeredFileProvider.createFileSystem(AbstractLayeredFileProvider.java:89)
	at org.apache.commons.vfs2.provider.AbstractLayeredFileProvider.findFile(AbstractLayeredFileProvider.java:63)
	at org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:693)
	at org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:621)
	at org.metaborg.core.resource.ResourceService.resolve(ResourceService.java:79)
	... 66 more

The URI file:///Users/gohla/Library/Application%252520Support/IdeaIC15/org.metaborg.intellij/classes/languages/org.metaborg.meta.lang.esv-2.0.0-SNAPSHOT.spoofax-language contains Application Support with wrong (double or triple) encoding for spaces.

Submitted by Gabriël Konat on 30 March 2016 at 13:58