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java.lang.NullPointerException at java.util.TreeMap.compare(TreeMap.java:1093) at java.util.TreeMap.put(TreeMap.java:465) at java.util.TreeSet.add(TreeSet.java:210) at java.util.Collections$SynchronizedCollection.add(Collections.java:1581) at org.archive.crawler.frontier.BdbFrontier$4.put(BdbFrontier.java:326) at org.archive.crawler.frontier.BdbFrontier.put(BdbFrontier.java:375) at org.archive.crawler.frontier.BdbFrontier.resurrectOneQueueState(BdbFrontier.java:359) at org.archive.crawler.frontier.BdbFrontier.resurrectQueueState(BdbFrontier.java:329) at org.archive.crawler.frontier.BdbFrontier.initQueue(BdbFrontier.java:272) at org.archive.crawler.frontier.WorkQueueFrontier.initialize(WorkQueueFrontier.java:269) at org.archive.crawler.frontier.BdbFrontier.initialize(BdbFrontier.java:467) at org.archive.crawler.framework.CrawlController.setupCrawlModules(CrawlController.java:652) at org.archive.crawler.framework.CrawlController.initialize(CrawlController.java:378) at org.archive.crawler.admin.CrawlJob.startCrawling(CrawlJob.java:777) at org.archive.crawler.admin.CrawlJobHandler.startNextJobInternal(CrawlJobHandler.java:1120) at org.archive.crawler.admin.CrawlJobHandler$2.run(CrawlJobHandler.java:1103) at java.lang.Thread.run(Thread.java:595)