com.mongodb.MongoException: Invalid ns [makara.]

[hinusel]

com.mongodb.MongoException: Invalid ns [makara.]

这个异常可能是怎么产生的啊？
我用的java API 是mongo-2.10.1.jar
makara是database name

[hinusel]

补充异常信息 Caused by: com.mongodb.MongoException: Invalid ns [makara.] at com.mongodb.MongoException.parse(MongoException.java:82) at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:314) at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:295) at com.mongodb.DBCursor._check(DBCursor.java:368) at com.mongodb.DBCursor._hasNext(DBCursor.java:459) at com.mongodb.DBCursor.hasNext(DBCursor.java:484) at com.run.makara.drivers.storage.impl.MongoDBDriver.fetch(Unknown Source) at com.run.makara.kernel.manage.FetchDataService.doAction(Unknown Source) at com.run.makara.kernel.manage.FetchDataService.doAction(Unknown Source) at com.run.makara.kernel.AbstractService.execService(Unknown Source) at com.run.makara.scheduler.TaskExercise.call(Unknown Source) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

[hinusel]

根据Net-Lost的提示 Invalid ns [makara.]应该具体指到collection上 说明makara.后的collectionName是空的，所以异常了 特别感谢mongoDB/redis群的Net-Lost学神