Exception in thread "main" java.lang.NoClassDefFoundError: com/mongodb/operation/ReadOperation

Question

I'm working on a DB project and this class instantiation code below seems to be failing. I can't seem to figure out why. I've made sure to run mongod and start MongoDB. Does anyone have any tips on how to resolve this?

public DatabaseInterface() {
        this.mongoClient = new MongoClient("127.0.0.1", 27017); ## This line
        this.database = mongoClient.getDatabase("dbmsProjectDB");
        this.gson = new Gson();
    }

Exception in thread "main" java.lang.NoClassDefFoundError: com/mongodb/operation/ReadOperation
    at backend.DatabaseInterface.<init>(DatabaseInterface.java:54)
    at backend.main.main(main.java:8)
Caused by: java.lang.ClassNotFoundException: com.mongodb.operation.ReadOperation
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
    ... 2 more

Which version of MongoDb driver are you using?

Harry Coder
– Harry Coder

2021-11-21 17:34:23 +00:00
Commented Nov 21, 2021 at 17:34 — Harry Coder
– Harry Coder, Commented Nov 21, 2021 at 17:34

YuTing · Accepted Answer · 2021-11-21 03:01:52Z

1

use MongoClients.create(uri) instead

String uri = "mongodb://localhost";
MongoClient mongoClient = MongoClients.create(uri);
MongoDatabase database = mongoClient.getDatabase("dbmsProjectDB");

answered Nov 21, 2021 at 3:01

YuTing

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Harry Coder · Accepted Answer · 2021-11-21 17:48:46Z

0

The message tells you that he is not able to find the class com.mongodb.operation.ReadOperation. This means that this class is no longer available in this location.

Upgrade the version of your MongoDb Java Driver to the 4.X.X versions. Beginning from those versions, the path of the ReadOperation class has changed to another location : com.mongodb.internal.operation.ReadOperation

answered Nov 21, 2021 at 17:48

Harry Coder

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