I am using Spring Boot in Maven to make a web service that connects to a server. The problem is that I haven't written any code for Mongo and it is trying to connect to localhost throwing me a MongoSocketOpenException. This is the stacktrace:


2017-10-11 14:22:17.407  INFO 9732 --- [lication.main()] c.m.s.SpringExternalWsApplication        : Started SpringExternalWsApplication in 4.283 seconds (JVM running for 6.98)
2017-10-11 14:22:18.144  INFO 9732 --- [localhost:27017] org.mongodb.driver.cluster               : Exception in monitor thread while connecting to server localhost:27017

com.mongodb.MongoSocketOpenException: Exception opening socket
        at com.mongodb.connection.SocketStream.open(SocketStream.java:63) ~[mongo-java-driver-3.4.3.jar:na]
        at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:115) ~[mongo-java-driver-3.4.3.jar:na]
        at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:113) ~[mongo-java-driver-3.4.3.jar:na]
        at java.lang.Thread.run(Thread.java:748) [na:1.8.0_144]
Caused by: java.net.ConnectException: Connection refused: connect
        at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_144]
        at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_144]
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_144]
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_144]
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_144]
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_144]
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_144]
        at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_144]
        at com.mongodb.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:57) ~[mongo-java-driver-3.4.3.jar:na]
        at com.mongodb.connection.SocketStream.open(SocketStream.java:58) ~[mongo-java-driver-3.4.3.jar:na]

        ... 3 common frames omitted


Solution:

down voteaccepted

Spring Boot has a feature called "auto configuration". In this case, as soon as the Mongo driver is detected on the classpath, the MongoAutoConfiguration is activated with default values, which point to localhost:27017. If you don't want that behaviour, you can now either configure the properties for MongoDB (see http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-mongodb for valid property keys) or disable the MongoAutoConfiguration: For Mongo 2.x, specify a host/port. For example, you might declare the following in your application.properties: spring.data.mongodb.host=mongoserver spring.data.mongodb.port=27017 Did mvn clean install and mvn exec: java