尝试连接到 MongoLab 时 URL 格式出现 MongoException

Question

我有一个使用 MongoLab 作为数据库的 Grails 2.4.4 应用程序。我之前使用 GORM (see plugin here) 的 mongo 插件连接到数据库。那不是一次很好的体验，所以我正在切换到 Morpia 并从 GORM 转向 mongodb。

我目前有 morphia 库版本 1.0.1 作为项目中的编译时依赖项。 我在 Mongolab 中创建了一个用户，用户名：用户名，密码：pass（不是实际的凭据...）

我正在尝试使用 MongoClient 连接到数据库。我一直在查看文档 (documentation here)，也参考了 this question，但它使用的是旧的连接方式。

这是我的错误，尽管我看不到引发此错误的原因，因为我的字符串格式似乎是正确的：

ERROR context.GrailsContextLoaderListener
- Error initializing the application: Error creating bean with name 'datastore': 
Cannot resolve reference to bean 'mongoClient' while setting constructor argument; 
nested exception is org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'mongoClient': Instantiation of bean failed; 
nested exception is org.springframework.beans.BeanInstantiationException: 
Could not instantiate bean class [com.mongodb.MongoClient]: Constructor threw exception; 
nested exception is com.mongodb.MongoException: host and port should be specified in host:port format
Message: Error creating bean with name 'datastore': Cannot resolve reference to bean 'mongoClient' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mongoClient': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.mongodb.MongoClient]: Constructor threw exception; nested exception is com.mongodb.MongoException: host and port should be specified in host:port format
Line | Method
->>  262 | run       in java.util.concurrent.FutureTask
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    745 | run       in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'mongoClient': 
Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException:
Could not instantiate bean class [com.mongodb.MongoClient]: Constructor threw exception; 
nested exception is com.mongodb.MongoException: host and port should be specified in host:port format
->>  262 | run       in java.util.concurrent.FutureTask
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    745 | run       in java.lang.Thread
Caused by BeanInstantiationException: Could not instantiate bean class [com.mongodb.MongoClient]: 
Constructor threw exception; nested exception is com.mongodb.MongoException: host and port should be specified in host:port format
->>  262 | run       in java.util.concurrent.FutureTask
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    745 | run       in java.lang.Thread
Caused by MongoException: host and port should be specified in host:port format
->>  122 | <init>    in com.mongodb.ServerAddress
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|     49 | <init>    in     ''
|    118 | <init> .  in com.mongodb.MongoClient
|    262 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    745 | run . . . in java.lang.Thread
| Error Forked Grails VM exited with error

这是我在 resources.groovy 中的一个代码片段，我在其中尝试将 MongoClient、Morphia 和我的数据存储区注册为 spring bean。

beans = {

String databaseUrl = "mongodb://username:pass@ds053251.mongolab.com:12345/trendapp" //fake port
String databaseName = "trendapp"

mongoClient(MongoClient, databaseUrl)
morphia(Morphia)

datastore(Datastore, ref('mongoClient'), databaseName) { bean ->
    bean.factoryBean = 'morphia'
    bean.factoryMethod = 'createDatastore'
}
}

感谢您的帮助，谢谢。

Answer 1

你应该为 MongoClient 提供一个 MongoClientURI

MongoClientURI mongoClientURI = new MongoClientURI("connection string");
MongoClient mongoClient = new MongoClient(mongoClientURI);

Answer 2

所以我不知道为什么会抛出这个错误，但我能够使用 MongoClient 的不同构造函数连接到我的数据库，特别是使用 (ServerAddress, List<MongoCredential>) 的构造函数。