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Attempt to use non-open Environment object().
java.lang.IllegalStateException: Attempt to use non-open Environment object(). at com.sleepycat.je.Environment.checkHandleIsValid(Environment.java:2153)[je-5.0.73.jar:5.0.73] at com.sleepycat.je.Environment.beginTransactionInternal(Environment.java:1312)[je-5.0.73.jar:5.0.73] at com.sleepycat.je.Environment.beginTransaction(Environment.java:1284)[je-5.0.73.jar:5.0.73] at edu.uci.ics.crawler4j.frontier.InProcessPagesDB.removeURL(InProcessPagesDB.java:58)[crawler4j-4.1.jar:na] at edu.uci.ics.crawler4j.frontier.Frontier.setProcessed(Frontier.java:163)[crawler4j-4.1.jar:na] at edu.uci.ics.crawler4j.crawler.WebCrawler.run(WebCrawler.java:262)[crawler4j-4.1.jar:na] at java.lang.Thread.run(Thread.java:745)[na:1.7.0_79]