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  1. java.util.ConcurrentModificationException: java.util.ConcurrentModificationException: java.util.ConcurrentModificationException
  2.     at sun.reflect.NativeConstructorAccessorImpl.newInstance0 (Native Method)
  3.     at sun.reflect.NativeConstructorAccessorImpl.newInstance (NativeConstructorAccessorImpl.java:62)
  4.     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance (DelegatingConstructorAccessorImpl.java:45)
  5.     at java.lang.reflect.Constructor.newInstance (Constructor.java:423)
  6.     at java.util.concurrent.ForkJoinTask.getThrowableException (ForkJoinTask.java:593)
  7.     at java.util.concurrent.ForkJoinTask.reportException (ForkJoinTask.java:677)
  8.     at java.util.concurrent.ForkJoinTask.join (ForkJoinTask.java:720)
  9.     at com.eulerity.hackathon.imagefinder.Spider.compute (Spider.java:85)
  10.     at com.eulerity.hackathon.imagefinder.Spider.compute (Spider.java:1)
  11.     at java.util.concurrent.RecursiveTask.exec (RecursiveTask.java:94)
  12.     at java.util.concurrent.ForkJoinTask.doExec (ForkJoinTask.java:289)
  13.     at java.util.concurrent.ForkJoinTask.externalAwaitDone (ForkJoinTask.java:326)
  14.     at java.util.concurrent.ForkJoinTask.doJoin (ForkJoinTask.java:391)
  15.     at java.util.concurrent.ForkJoinTask.join (ForkJoinTask.java:719)
  16.     at java.util.concurrent.ForkJoinPool.invoke (ForkJoinPool.java:2616)
  17.     at com.eulerity.hackathon.imagefinder.ImageFinder.doPost (ImageFinder.java:45)
  18.     at javax.servlet.http.HttpServlet.service (HttpServlet.java:707)
  19.     at javax.servlet.http.HttpServlet.service (HttpServlet.java:790)
  20.     at org.eclipse.jetty.servlet.ServletHolder.handle (ServletHolder.java:808)
  21.     at org.eclipse.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:587)
  22.     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:143)
  23.     at org.eclipse.jetty.security.SecurityHandler.handle (SecurityHandler.java:577)
  24.     at org.eclipse.jetty.server.session.SessionHandler.doHandle (SessionHandler.java:223)
  25.     at org.eclipse.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1127)
  26.     at org.eclipse.jetty.servlet.ServletHandler.doScope (ServletHandler.java:515)
  27.     at org.eclipse.jetty.server.session.SessionHandler.doScope (SessionHandler.java:185)
  28.     at org.eclipse.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1061)
  29.     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:141)
  30.     at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle (ContextHandlerCollection.java:215)
  31.     at org.eclipse.jetty.server.handler.HandlerCollection.handle (HandlerCollection.java:110)
  32.     at org.eclipse.jetty.server.handler.HandlerWrapper.handle (HandlerWrapper.java:97)
  33.     at org.eclipse.jetty.server.Server.handle (Server.java:499)
  34.     at org.eclipse.jetty.server.HttpChannel.handle (HttpChannel.java:310)
  35.     at org.eclipse.jetty.server.HttpConnection.onFillable (HttpConnection.java:257)
  36.     at org.eclipse.jetty.io.AbstractConnection$2.run (AbstractConnection.java:540)
  37.     at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob (QueuedThreadPool.java:635)
  38.     at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run (QueuedThreadPool.java:555)
  39.     at java.lang.Thread.run (Thread.java:750)
  40. Caused by: java.util.ConcurrentModificationException: java.util.ConcurrentModificationException
  41.     at sun.reflect.NativeConstructorAccessorImpl.newInstance0 (Native Method)
  42. at sun.reflect.NativeConstructorAccessorImpl.newInstance (NativeConstructorAccessorImpl.java:62)
  43.     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance (DelegatingConstructorAccessorImpl.java:45)
  44. at java.lang.reflect.Constructor.newInstanceCrawling https://www.waterfrontmontessori.com/location-and-facilities for a
  45.  (Constructor.java:423)
  46.     at java.util.concurrent.ForkJoinTask.getThrowableException (ForkJoinTask.java:593)
  47.     at java.util.concurrent.ForkJoinTask.reportException (ForkJoinTask.java:677)
  48.     at java.util.concurrent.ForkJoinTask.join (ForkJoinTask.java:720)
  49.     at com.eulerity.hackathon.imagefinder.Spider.compute (Spider.java:85)
  50.     at com.eulerity.hackathon.imagefinder.Spider.compute (Spider.java:1)
  51.     at java.util.concurrent.RecursiveTask.exec (RecursiveTask.java:94)
  52.     at java.util.concurrent.ForkJoinTask.doExec (ForkJoinTask.java:289)
  53.     at java.util.concurrent.ForkJoinTask.doJoin (ForkJoinTask.java:389)
  54.     at java.util.concurrent.ForkJoinTask.join (ForkJoinTask.java:719)
  55.     at com.eulerity.hackathon.imagefinder.Spider.compute (Spider.java:85)
  56.     at com.eulerity.hackathon.imagefinder.Spider.compute (Spider.java:1)
  57.     at java.util.concurrent.RecursiveTask.exec (RecursiveTask.java:94)
  58.     at java.util.concurrent.ForkJoinTask.doExec (ForkJoinTask.java:289)
  59.     at java.util.concurrent.ForkJoinPool$WorkQueue.runTask (ForkJoinPool.java:1056)
  60.     at java.util.concurrent.ForkJoinPool.runWorker (ForkJoinPool.java:1692)
  61.     at java.util.concurrent.ForkJoinWorkerThread.run (ForkJoinWorkerThread.java:175)
  62. Caused by: java.util.ConcurrentModificationException
  63.     at java.util.ArrayList$ArrayListSpliterator.tryAdvance (ArrayList.java:1363)
  64.     at java.util.stream.ReferencePipeline.forEachWithCancel (ReferencePipeline.java:126)
  65.     at java.util.stream.AbstractPipeline.copyIntoWithCancel (AbstractPipeline.java:499)
  66.     at java.util.stream.AbstractPipeline.copyInto (AbstractPipeline.java:486)
  67.     at java.util.stream.AbstractPipeline.wrapAndCopyInto (AbstractPipeline.java:472)
  68.     at java.util.stream.MatchOps$MatchOp.evaluateSequential (MatchOps.java:230)
  69.     at java.util.stream.MatchOps$MatchOp.evaluateSequential (MatchOps.java:196)
  70.     at java.util.stream.AbstractPipeline.evaluate (AbstractPipeline.java:234)
  71.     at java.util.stream.ReferencePipeline.anyMatch (ReferencePipeline.java:516)
  72.     at com.eulerity.hackathon.imagefinder.SpiderUtils.containsURL (SpiderUtils.java:36)
  73.     at com.eulerity.hackathon.imagefinder.SpiderUtils.isLinkURLValid (SpiderUtils.java:49)
  74.     at com.eulerity.hackathon.imagefinder.Spider.lambda$2 (Spider.java:79)
  75.     at java.util.stream.ReferencePipeline$2$1.accept (ReferencePipeline.java:174)
  76.     at java.util.ArrayList$ArrayListSpliterator.forEachRemaining (ArrayList.java:1384)
  77.     at java.util.stream.AbstractPipeline.copyInto (AbstractPipeline.java:482)
  78.     at java.util.stream.AbstractPipeline.wrapAndCopyInto (AbstractPipeline.java:472)
  79.     at java.util.stream.AbstractPipeline.evaluate (AbstractPipeline.java:546)
  80.     at java.util.stream.AbstractPipeline.evaluateToArrayNode (AbstractPipeline.java:260)
  81.     at java.util.stream.ReferencePipeline.toArray (ReferencePipeline.java:505)
  82.     at com.eulerity.hackathon.imagefinder.Spider.compute (Spider.java:80)
  83.     at com.eulerity.hackathon.imagefinder.Spider.compute (Spider.java:1)
  84.     at java.util.concurrent.RecursiveTask.exec (RecursiveTask.java:94)
  85.     at java.util.concurrent.ForkJoinTask.doExec (ForkJoinTask.java:289)
  86.     at java.util.concurrent.ForkJoinPool$WorkQueue.runTask (ForkJoinPool.java:1056)
  87.     at java.util.concurrent.ForkJoinPool.runWorker (ForkJoinPool.java:1692)
  88.     at java.util.concurrent.ForkJoinWorkerThread.run (ForkJoinWorkerThread.java:175)
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