【发布时间】：2016-03-17 00:12:56
【问题描述】：
作为 MongoDB 的新手，我正在尝试将一个简单的文档插入到我新安装的 mongoDB (v3.2.4) 中。使用 MongoDB 驱动程序 3.2.2。 这是我的最小化代码：
public <classname>()
{
public static final String COLLECTION_NAME = "logs";
MongoClient mongoClient = new MongoClient("<server-adress>");
MongoDatabase db = mongoClient.getDatabase("test");
Document data = new Document ();
data.append(<whatever>);
//...inserting more into document...
db.getCollection(COLLECTION_NAME).insertOne(data); //collection should be created new
mongoClient.close();
}
程序正在执行，但我在执行过程中收到以下错误（和信息）：
Mär 16, 2016 3:50:06 PM com.mongodb.diagnostics.logging.JULLogger log
INFORMATION: Cluster created with settings {hosts=[<server-adress>:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
Mär 16, 2016 3:50:06 PM com.mongodb.diagnostics.logging.JULLogger log
INFORMATION: No server chosen by WritableServerSelector from cluster description ClusterDescription{type=UNKNOWN, connectionMode=SINGLE, all=[ServerDescription{address=<server-adress>:27017, type=UNKNOWN, state=CONNECTING}]}. Waiting for 30000 ms before timing out
Mär 16, 2016 3:50:07 PM com.mongodb.diagnostics.logging.JULLogger log
INFORMATION: Exception in monitor thread while connecting to server <server-adress>:27017
com.mongodb.MongoSocketOpenException: Exception opening socket
at com.mongodb.connection.SocketStream.open(SocketStream.java:63)
at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:114)
at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:128)
at java.lang.Thread.run(Unknown Source)
Caused by: java.net.ConnectException: Connection refused: connect
(...)
at com.mongodb.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:50)
at com.mongodb.connection.SocketStream.open(SocketStream.java:58)
... 3 more
Error: Timed out after 30000 ms while waiting for a server that matches WritableServerSelector. Client view of cluster state is {type=UNKNOWN, servers=[{address=<server-adress>:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketOpenException: Exception opening socket}, caused by {java.net.ConnectException: Connection refused: connect}}]
文档也没有插入。
当我使用 insertOne() 命令注释该行时，它会消失。所以我认为这不是连接问题，对吗？
我有一些想法：
- 它与异步有关吗？我会感到惊讶，我没有说过我不想同步执行它。
- 是否缺少任何权限（因为这个
WritableServerSelector-Thing）？ - 它与“测试”数据库有关吗？
- MongoDB的单机模式有问题吗？ （我不想使用副本集。）
但是对于所有这些想法，我找不到真正的证据......
（请改进问题标题，我没有更好的主意......）
【问题讨论】：