Apache Nutject注入網址

Question

我是Apache Nutch（2.3.1）和mongodb（3.4.7）的新手。 安裝步驟后，我想注入URL並爬網Wikipedia網站。 當我在終端中運行“ ./nutch注入URL”時，我遇到了這個錯誤。

~/apache-nutch-2.3.1/runtime/local/bin$ ./nutch inject urls InjectorJob: starting at 2017-11-26 19:07:35 InjectorJob: Injecting urlDir: urls InjectorJob: org.apache.gora.util.GoraException: java.lang.NullPointerException at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:167) at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:135) at org.apache.nutch.storage.StorageUtils.createWebStore(StorageUtils.java:78) at org.apache.nutch.crawl.InjectorJob.run(InjectorJob.java:218) at org.apache.nutch.crawl.InjectorJob.inject(InjectorJob.java:252) at org.apache.nutch.crawl.InjectorJob.run(InjectorJob.java:275) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70) at org.apache.nutch.crawl.InjectorJob.main(InjectorJob.java:284) Caused by: java.lang.NullPointerException at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936) at java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:964) at org.apache.gora.mongodb.store.MongoStore.getDB(MongoStore.java:192) at org.apache.gora.mongodb.store.MongoStore.initialize(MongoStore.java:122) at org.apache.gora.store.DataStoreFactory.initializeDataStore(DataStoreFactory.java:102) at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:161) ... 7 more

Answer 1

實際上，我在$ NUTCH_HOME / conf / gora.properties文件中設置了錯誤的Mongo數據庫名稱。 修復后，Apache螺母可以正常工作。