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Operating System:
Windows
Steps To Reproduce:
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Mongo mongo = new MongoClient(); DB db = mongo.getDB("TestDB"); // TestDB exists BasicDBObject dbStats = new BasicDBObject("dbStats", "1"); dbStats.put("scale", 1); CommandResult command = db.command(dbStats); if (!command.ok()) { throw command.getException(); }

Output:

com.mongodb.CommandFailureException: { "serverUsed" : "127.0.0.1:27017" , "errmsg" : "exception: need a valid database name" , "code" : 28539 , "ok" : 0.0}
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Mongo mongo = new MongoClient(); DB db = mongo.getDB( "TestDB" ); // TestDB exists BasicDBObject dbStats = new BasicDBObject( "dbStats" , "1" ); dbStats.put( "scale" , 1); CommandResult command = db.command(dbStats); if (!command.ok()) { throw command.getException(); } Output: com.mongodb.CommandFailureException: { "serverUsed" : "127.0.0.1:27017" , "errmsg" : "exception: need a valid database name" , "code" : 28539 , "ok" : 0.0}

The combination mongo-java-driver-2.13.2 & MongoDB server 3.0.2/3.0.4 causes the dbStats command to fail:

com.mongodb.CommandFailureException:

{ "serverUsed" : "127.0.0.1:27017" , "errmsg" : "exception: need a valid database name" , "code" : 28539 , "ok" : 0.0}

END

The same code works for a MongoDB 2.x server using the same driver.