DiscordConnector irregularly throws AccessControlExceptions

[J0B10]

Description

During tests I now encountered an AccessControlException multiple times.
Often (but not allways) the first thing throwing the exception is one of JDAs RateLimit-Workers.
I suspect that it has some problems with the SandboxSecurityManager but I couldn't figure out till now what is actually causing it.

As I tried debugging it completly disappeared and till now didn't occur again.
We even did some heavy spaming with the badge bot to provoke some errors, but everything was working fine again.

Stack trace

8483295 15:47:25.857 [ForkJoinPool.commonPool-worker-8] WARN  discord.DiscordChatConnector  - Rest action for connector badge bot failed: -1: java.security.AccessControlException
8586147 15:49:08.709 [JDA MainWS-ReadThread] INFO  manager.PluginManagerImpl  - [badges] Created sub badge for Shatox, saved it under subbadgetemp/Shatox _1.png
8586148 15:49:08.710 [JDA RateLimit-Worker 5] ERROR requests.Requester  - There was an exception while executing a REST request
java.security.AccessControlException: access denied ("java.net.SocketPermission" "discordapp.com" "resolve")
	at java.security.AccessControlContext.checkPermission(AccessControlContext.java:472)
	at java.security.AccessController.checkPermission(AccessController.java:884)
	at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
	at java.lang.SecurityManager.checkConnect(SecurityManager.java:1048)
	at java.net.InetAddress.getAllByName0(InetAddress.java:1269)
	at java.net.InetAddress.getAllByName(InetAddress.java:1193)
	at java.net.InetAddress.getAllByName(InetAddress.java:1127)
	at okhttp3.Dns.lambda$static$0(Dns.java:39)
	at okhttp3.internal.connection.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:185)
	at okhttp3.internal.connection.RouteSelector.nextProxy(RouteSelector.java:149)
	at okhttp3.internal.connection.RouteSelector.next(RouteSelector.java:84)
	at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:214)
	at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:135)
	at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:114)
	at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
	at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:94)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
	at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
	at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:125)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
	at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:264)
	at okhttp3.RealCall.execute(RealCall.java:93)
	at net.dv8tion.jda.core.requests.Requester.execute(Requester.java:191)
	at net.dv8tion.jda.core.requests.Requester.execute(Requester.java:133)
	at net.dv8tion.jda.core.requests.Requester.execute(Requester.java:116)
	at net.dv8tion.jda.core.requests.ratelimit.BotRateLimiter$Bucket.run(BotRateLimiter.java:350)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

[sebinside]

By reading the error message: Pretty sure thats a sandbox problem. The RateLimit-Worker sends a REST request which is blocked.

The strange thing: If the origin of this request is the connector (e.g. the bot), everything should work fine. I could imagine that the request is an (unprivileged) side effect of a (privileged) bot action. That would be a problem :D

[J0B10]

Now didn't happen for >4 months.

When it reoccurs we'll reopen it.