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    一、错误描述

                   在项目中使用java连接mongodb数据库，使用的是mongoclient连接，代码如下：

public  void mongodbTest (String ip,int port,String user,String password,String dbname){		  MongoDatabase db=null;		  MongoClient client=null;		  try{		     MongoClientOptions.Builder build = new MongoClientOptions.Builder();  		        //与数据最大连接数50  		        build.connectionsPerHost(50);  		        //如果当前所有的connection都在使用中，则每个connection上可以有50个线程排队等待  		        build.threadsAllowedToBlockForConnectionMultiplier(50);  		        build.connectTimeout(1*60*1000);  		        build.maxWaitTime(2*60*1000);  		        MongoClientOptions options = build.build();	                         //设置服务器信息	        		        ServerAddress serverAddress = new ServerAddress(ip, port);  	                List
   
     seeds = new ArrayList
    
     ();  	                seeds.add(serverAddress);                           //设置验证信息	                MongoCredential credentials = MongoCredential.createMongoCRCredential(user, dbname,  	            		password.toCharArray());  	                List
     
       credentialsList = new ArrayList
      
       ();  	                credentialsList.add(credential); 	            		        client =new MongoClient(seeds, credentialsList,options);  		        //获取数据库mydb,不存在的话，会自动建立该数据库  		        db = client.getDatabase("mydb");  		       		  }catch (Exception e) {  		       return e.getClass().getName() + ": " + e.getMessage();	          	            		  }		      if(db!=null&&client!=null){                            //获取集合                           MongoCollection
       
         documents = db.getCollection("mydb");  		                                   Document document=documents.find().first();                               System.out.println(document.toJson());                        		      }		     client.close();                	}
       
      
     
    
   

com.mongodb.MongoSecurityException: Exception authenticating	at com.mongodb.connection.NativeAuthenticator.authenticate(NativeAuthenticator.java:48)	at com.mongodb.connection.InternalStreamConnectionInitializer.authenticateAll(InternalStreamConnectionInitializer.java:109)	at com.mongodb.connection.InternalStreamConnectionInitializer.initialize(InternalStreamConnectionInitializer.java:46)	at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:116)	at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:113)	at java.lang.Thread.run(Unknown Source)Caused by: com.mongodb.MongoCommandException: Command failed with error 18: 'auth failed' on server xxx.xxx.xxx.xxx:27017. The full response is { "ok" : 0.0, "errmsg" : "auth failed", "code" : 18 }	at com.mongodb.connection.CommandHelper.createCommandFailureException(CommandHelper.java:170)	at com.mongodb.connection.CommandHelper.receiveCommandResult(CommandHelper.java:123)	at com.mongodb.connection.CommandHelper.executeCommand(CommandHelper.java:32)	at com.mongodb.connection.NativeAuthenticator.authenticate(NativeAuthenticator.java:46)	... 5 more

    二、解决办法

                官网查了一下官网，找到了问题的所在，文档如下

         到mongodb数据库的admin数据库中一查，发现验证机制为SCRAM-SHA-1，于是在java代码中将createMongoCRCredential()方法换成createScramShalCredential()方法，验证通过，成功解决问题

public  void mongodbTest (String ip,int port,String user,String password,String dbname){		  MongoDatabase db=null;		  MongoClient client=null;		  try{		     MongoClientOptions.Builder build = new MongoClientOptions.Builder();  		        //与数据最大连接数50  		        build.connectionsPerHost(50);  		        //如果当前所有的connection都在使用中，则每个connection上可以有50个线程排队等待  		        build.threadsAllowedToBlockForConnectionMultiplier(50);  		        build.connectTimeout(1*60*1000);  		        build.maxWaitTime(2*60*1000);  		        MongoClientOptions options = build.build();	                         //设置服务器信息	        		        ServerAddress serverAddress = new ServerAddress(ip, port);  	                List
   
     seeds = new ArrayList
    
     ();  	                seeds.add(serverAddress);                           //设置验证信息	                MongoCredential credentials = MongoCredential.createScramSha1Credential(user, dbname, password.toCharArray());  	                List
     
       credentialsList = new ArrayList
      
       ();  	                credentialsList.add(credential); 	            		        client =new MongoClient(seeds, credentialsList,options);  		        //获取数据库mydb,不存在的话，会自动建立该数据库  		        db = client.getDatabase("mydb");  		       		  }catch (Exception e) {  		       return e.getClass().getName() + ": " + e.getMessage();	          	            		  }		      if(db!=null&&client!=null){                            //获取集合                           MongoCollection
       
         documents = db.getCollection("mydb");  		                                   Document document=documents.find().first();                               System.out.println(document.toJson());                        		      }		     client.close();                	}
       
      
     
    
   

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