java mongodb Timed out WritableServerSelector

Caused by: com.mongodb.MongoTimeoutException: Timed out after 30000 ms while waiting for a server that matches WritableServerSelector. Client view of cluster state is {type=UNKNOWN, servers=[{address=XXX.XXX.XXX.XXX:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSecurityException: Exception authenticating MongoCredential{mechanism=null, userName='admin', source='GWPayCenter', password=, mechanismProperties={}}}, caused by {com.mongodb.MongoCommandException: Command failed with error 18: 'Authentication failed.' on server XXX.XXX.XXX.XXX:27017. The full response is { "ok" : 0.0, "errmsg" : "Authentication failed.", "code" : 18, "codeName" : "AuthenticationFailed" }}}]
    at com.mongodb.connection.BaseCluster.createTimeoutException(BaseCluster.java:375)
    at com.mongodb.connection.BaseCluster.selectServer(BaseCluster.java:104)
    at com.mongodb.binding.ClusterBinding$ClusterBindingConnectionSource.(ClusterBinding.java:75)
    at com.mongodb.binding.ClusterBinding$ClusterBindingConnectionSource.(ClusterBinding.java:71)
    at com.mongodb.binding.ClusterBinding.getWriteConnectionSource(ClusterBinding.java:68)
    at com.mongodb.operation.OperationHelper.withConnection(OperationHelper.java:413)
    at com.mongodb.operation.CreateIndexesOperation.execute(CreateIndexesOperation.java:144)
    at com.mongodb.operation.CreateIndexesOperation.execute(CreateIndexesOperation.java:71)
    at com.mongodb.Mongo.execute(Mongo.java:819)
    at com.mongodb.Mongo$2.execute(Mongo.java:802)
    at com.mongodb.MongoCollectionImpl.createIndexes(MongoCollectionImpl.java:491)
    at com.mongodb.MongoCollectionImpl.createIndex(MongoCollectionImpl.java:458)
    at org.springframework.data.mongodb.core.DefaultIndexOperations.lambda$ensureIndex$0(DefaultIndexOperations.java:111)
    at org.springframework.data.mongodb.core.DefaultIndexOperations.execute(DefaultIndexOperations.java:192)

问题描述

java 连接mongodb报超时，相同用户用NoSQLBooster for MongoDB连接成功，排除用户名密码问题、mongo server未启动问题，管理员账号登录，也不该有权限不足问题

解决方法

账号权限问题，改用目标库对应的账号即可

查询指定账号所对应的库，连接库不在结果中会连接失败

db.getCollection("system.users").find({"user":'devuser'})
   .projection({})
   .sort({_id:-1})
   .limit(100)

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