Connection timed out
or
Authentication failed

org.springframework.data.mongodb.UncategorizedMongoDbException: 
MongoDB exception while executing query: 
Authentication failed for user 'your_username'

java.net.UnknownHostException: 
Your server IP address is not allowed to access the MongoDB cluster

org.springframework.data.mongodb.UncategorizedMongoDbException: 
Database not found: 'your_database_name'

org.springframework.data.mongodb.UncategorizedMongoDbException: 
Cannot connect to server 127.0.0.1:27017

org.springframework.data.mongodb.UncategorizedMongoDbException: 
Failed to connect to server 127.0.0.1:27017

org.springframework.data.mongodb.UncategorizedMongoDbException: 
Failed to connect to MongoDB

org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'mongo' defined in class path resource [org/springframework/boot/autoconfigure/mongo/MongoAutoConfiguration.class]: 
Initialization of bean failed; nested exception is 
org.springframework.beans.factory.UnsatisfiedDependencyException: 
Error creating bean with name 'mongoDbFactory' defined in class path resource [org/springframework/boot/autoconfigure/mongo/MongoAutoConfiguration.class]: 
Unsatisfied dependency expressed through method 'mongoDbFactory' parameter 0; 
nested exception is org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'mongo' defined in class path resource [org/springframework/boot/autoconfigure/mongo/MongoAutoConfiguration.class]: 
Bean instantiation via factory method failed; nested exception is 
org.springframework.beans.BeanInstantiationException: 
Failed to instantiate [com.mongodb.MongoClient]: 
Factory method 'mongo' threw exception; nested exception is 
java.lang.IllegalArgumentException: 
Invalid connection string

@SpringBootApplication(exclude = {MongoAutoConfiguration.class, MongoDataAutoConfiguration.class})

java.lang.NoSuchMethodError: 
com.mongodb.MongoClient.<init>(Ljava/net/ServerAddress;Ljava/util/List;Lcom/mongodb/ClientOptions;Lcom/mongodb/DBEncoder;Lcom/mongodb/DBDecoder;)

org.springframework.data.mongodb.UncategorizedMongoDbException: 
Access denied, the database 'your_database' is not allowed to be accessed by the client

Failed to start up WiredTiger under any compatibility version

sudo chown -R mongodb:mongodb /var/lib/mongodb
sudo rm -fr /var/lib/mongodb/*

com.mongodb.MongoTimeoutException: 
Timed out after 30000 ms while waiting for a server that matches ReadPreference 
{mechanism: null, mode: primary}. 
Client view of cluster state is {type: REPLICASET, servers: [{address: localhost:27017, type: 
UNKNOWN, state: 0, lastUpdateTime: 0}]}.

spring:
  data:
    mongodb:
      connections:
        timeout: 5000

Failed to start MongoDB service

com.mongodb.MongoTimeoutException: 
Timed out after 30000 ms while waiting for a server that matches ReadPreference 
{mechanism: null, mode: primary}. 
Client view of cluster state is {type: REPLICASET, servers: [{address: localhost:27017, type: 
UNKNOWN, state: 0, lastUpdateTime: 0}]}.

spring:
  data:
    mongodb:
      uri: mongodb://<username>:<password>@<host>:<port>/<database>
      # 或者使用單獨(dú)的配置
      host: 127.0.0.1
      port: 27017
      username: your_username
      password: your_password
      database: your_database
      connections:
        timeout: 5000