java.lang.NoClassDefFoundError: org/mozilla/javascript/Scriptable
	at delight.rhinosandox.RhinoSandboxes.create(RhinoSandboxes.java:9)
	at com.github.markusbernhardt.proxy.selector.pac.JavaxPacScriptParser.setupEngine(JavaxPacScriptParser.java:51)
	at com.github.markusbernhardt.proxy.selector.pac.JavaxPacScriptParser.<init>(JavaxPacScriptParser.java:40)
	at com.github.markusbernhardt.proxy.selector.pac.PacProxySelector.selectEngine(PacProxySelector.java:76)
	at com.github.markusbernhardt.proxy.selector.pac.PacProxySelector.<init>(PacProxySelector.java:41)
	at com.intellij.util.net.IdeaWideProxySelector.select(IdeaWideProxySelector.java:75)
	at com.intellij.util.proxy.CommonProxy.select(CommonProxy.java:213)
	at com.intellij.util.proxy.CommonProxy.select(CommonProxy.java:182)
	at com.intellij.util.net.HttpConfigurable.openConnection(HttpConfigurable.java:412)
	at com.intellij.util.net.HttpConfigurable.prepareURL(HttpConfigurable.java:391)
	at com.intellij.internal.statistic.libraryJar.LibraryJarStatisticsService.createVersionsUrl(LibraryJarStatisticsService.java:82)
	at com.intellij.internal.statistic.libraryJar.LibraryJarStatisticsService.getTechnologyDescriptors(LibraryJarStatisticsService.java:54)
	at com.intellij.internal.statistic.libraryJar.LibraryJarStatisticsService.lambda$runActivity$0(LibraryJarStatisticsService.java:98)
	at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:314)
	at java.util.concurrent.Executors$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)
Caused by: java.lang.ClassNotFoundException: org.mozilla.javascript.Scriptable
	at com.intellij.util.lang.UrlClassLoader.findClass(UrlClassLoader.java:241)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 19 more
#とりあえずの策
Settings -> HTTP Proxy -> Auto-Detect proxy settings
がチェックされているとだめみたいなので no proxyに変更。