- 报错
com.mongodb.MongoCommandException: Command failed with error 48 (NamespaceExists): 'a collection 'mapMongoDB.macCode01' already exists' on server localhost:27017. The full response is { "ok" : 0.0, "errmsg" : "a collection ' **mapMongoDB.macCode01** ' already exists", "code" : 48, "codeName" : "NamespaceExists" }
at com.mongodb.internal.connection.ProtocolHelper.getCommandFailureException(ProtocolHelper.java:179)
at com.mongodb.internal.connection.InternalStreamConnection.receiveCommandMessageResponse(InternalStreamConnection.java:293)
at com.mongodb.internal.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:255)
at com.mongodb.internal.connection.UsageTrackingInternalConnection.sendAndReceive(UsageTrackingInternalConnection.java:99)
at com.mongodb.internal.connection.DefaultConnectionPool$PooledConnection.sendAndReceive(DefaultConnectionPool.java:444)
at com.mongodb.internal.connection.CommandProtocolImpl.execute(CommandProtocolImpl.java:72)
at com.mongodb.internal.connection.DefaultServer$DefaultServerProtocolExecutor.execute(DefaultServer.java:200)
at com.mongodb.internal.connection.DefaultServerConnection.executeProtocol(DefaultServerConnection.java:269)
at com.mongodb.internal.connection.DefaultServerConnection.command(DefaultServerConnection.java:131)
at com.mongodb.internal.connection.DefaultServerConnection.command(DefaultServerConnection.java:123)
at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:242)
at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:233)
at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:170)
at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:163)
at com.mongodb.operation.CreateCollectionOperation$1.call(CreateCollectionOperation.java:381)
at com.mongodb.operation.CreateCollectionOperation$1.call(CreateCollectionOperation.java:377)
at com.mongodb.operation.OperationHelper.withConnectionSource(OperationHelper.java:453)
at com.mongodb.operation.OperationHelper.withConnection(OperationHelper.java:415)
at com.mongodb.operation.CreateCollectionOperation.execute(CreateCollectionOperation.java:377)
at com.mongodb.operation.CreateCollectionOperation.execute(CreateCollectionOperation.java:54)
at com.mongodb.client.internal.MongoClientDelegate$DelegateOperationExecutor.execute(MongoClientDelegate.java:193)
at com.mongodb.client.internal.MongoDatabaseImpl.executeCreateCollection(MongoDatabaseImpl.java:300)
at com.mongodb.client.internal.MongoDatabaseImpl.createCollection(MongoDatabaseImpl.java:257)
at com.mongodb.client.internal.MongoDatabaseImpl.createCollection(MongoDatabaseImpl.java:252)
at com.example.demo.Demo.mongoDBRepository.mongoDBRepository.main(mongoDBRepository.java:24)
- 原因
- 当前库中的集合已经存在了，再次创建会抛出异常
- 解决方案一
- 删除存在的集合：
db.macCode01.drop();
- 解决方案二
- 创建新的集合：
db.createCollection("collName", {size: 20, capped: 5, max: 100});//创建成功会显示{"ok":1}