项目中没有配置mongodb，但是显示Exception opening socket

com.mongodb.MongoSocketOpenException: Exception opening socket
	at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:70) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.InternalStreamConnection.open(InternalStreamConnection.java:128) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:117) ~[mongodb-driver-core-3.11.2.jar:na]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_192]
Caused by: java.net.ConnectException: Connection refused: connect
	at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_192]
	at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_192]
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_192]
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_192]
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_192]
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_192]
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_192]
	at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_192]
	at com.mongodb.internal.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:64) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.SocketStream.initializeSocket(SocketStream.java:79) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:65) ~[mongodb-driver-core-3.11.2.jar:na]
	... 3 common frames omitted

启动spring boot 结果直接报mongodb错误，挺奇怪的工程还没有配置mongodb 。猜想是不是工程有mongodb jar包

然后 boot 自然配置了

查了资料原来

springboot自动配置了支持mongodb。在启动springboot时会自动实例化一个mongo实例。

现在要禁用自动配置

@SpringBootApplication(exclude = MongoAutoConfiguration.class)

这个注解可以禁用springboot自带的配置