与Java中连接MongoDB的问题

huangapple
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英文:

Problem with connecting to MongoDB on Java

问题

  1. 我在Java中使用MongoDB遇到了问题。我无法连接到数据库，总是收到异常并且无法解决。我使用了Maven依赖来实现。我尝试过使用其他版本的依赖。
  3. 我还确认了MongoDB是否在运行。我使用 *net start MongoDB* 命令启动了它。
  5. 我的代码：
  7.     import com.mongodb.MongoClient;
  8.     import com.mongodb.MongoClientURI;
  9.     
  10.     public class MongoDBTest {
  11.     
  12.         public static void main(String[] args) throws Exception {
  13.     		MongoClient mongoClient = new MongoClient(new MongoClientURI("mongodb://127.0.0.1:27017"));
  14.     	}
  15.     
  16.     }
  18. 我的依赖：
  20.     <dependency>
  21. 		<groupId>org.mongodb</groupId>
  22. 		<artifactId>mongo-java-driver</artifactId>
  23. 		<version>3.10.0</version>
  24. 	</dependency>
  26. 而我收到的异常信息：
  28.     Exception in thread "main" java.lang.NoSuchMethodError: com.mongodb.ConnectionString.getThreadsAllowedToBlockForConnectionMultiplier()Ljava/lang/Integer;
  29. 	at com.mongodb.MongoClientURI.getOptions(MongoClientURI.java:351)
  30. 	at com.mongodb.Mongo.createCluster(Mongo.java:724)
  31. 	at com.mongodb.Mongo.<init>(Mongo.java:312)
  32. 	at com.mongodb.Mongo.<init>(Mongo.java:308)
  33. 	at com.mongodb.MongoClient.<init>(MongoClient.java:326)
  34. 	at schlueting.arbeiten.MongoDBTest.main(MongoDBTest.java:9)
英文:

I have a problem with my MongoDB in Java. I cannot connect to it I always get an exception and could not resolve it. I use Maven Dependencies for that. I tried using other versions of the dependency.

I also checked that the MongoDB is running. I started it with net start MongoDB.
My code:

  1. import com.mongodb.MongoClient;
  2. import com.mongodb.MongoClientURI;
  4. public class MongoDBTest {
  6.     public static void main(String[] args) throws Exception {
  7. 		MongoClient mongoClient = new MongoClient(new MongoClientURI(&quot;mongodb://127.0.0.1:27017&quot;));
  8. 	}
  10. }

My dependency:

  1. &lt;dependency&gt;
  2. 	&lt;groupId&gt;org.mongodb&lt;/groupId&gt;
  3. 	&lt;artifactId&gt;mongo-java-driver&lt;/artifactId&gt;
  4. 	&lt;version&gt;3.10.0&lt;/version&gt;
  5. &lt;/dependency&gt;

And the exception i got:

  1. Exception in thread &quot;main&quot; java.lang.NoSuchMethodError: com.mongodb.ConnectionString.getThreadsAllowedToBlockForConnectionMultiplier()Ljava/lang/Integer;
  2. at com.mongodb.MongoClientURI.getOptions(MongoClientURI.java:351)
  3. at com.mongodb.Mongo.createCluster(Mongo.java:724)
  4. at com.mongodb.Mongo.&lt;init&gt;(Mongo.java:312)
  5. at com.mongodb.Mongo.&lt;init&gt;(Mongo.java:308)
  6. at com.mongodb.MongoClient.&lt;init&gt;(MongoClient.java:326)
  7. at schlueting.arbeiten.MongoDBTest.main(MongoDBTest.java:9)

答案1

得分: 2

解决方案是将以下内容添加到Maven依赖项中：

  1. <dependency>
  2.     <groupId>org.mongodb</groupId>
  3.     <artifactId>mongodb-driver-sync</artifactId>
  4.     <version>3.10.1</version>
  5. </dependency>

这解决了异常问题，我成功连接到了MavenDB。

顺便提一下，我当时使用的是MongoDB 4.4和JDK 11。

英文:

The solution was to add the following to the Maven dependencies:

  1. &lt;dependency&gt;
  2.     &lt;groupId&gt;org.mongodb&lt;/groupId&gt;
  3.     &lt;artifactId&gt;mongodb-driver-sync&lt;/artifactId&gt;
  4.     &lt;version&gt;3.10.1&lt;/version&gt;
  5. &lt;/dependency&gt;

That fixed the Exception and I could connect to the MavenDB.

Btw. I was using MongoDB 4.4 and JDK 11.

huangapple
  • 本文由 发表于 2020年10月27日 17:57:22
  • 转载请务必保留本文链接：https://go.coder-hub.com/64551976.html
  • java
  • maven
  • mongodb
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