Mongo tries to connect automatically to port 27017(localhost) - spring

Question

I am using Spring Rest and Mongo 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. The only code I've written is a two line code that starts spring from main.This is the stacktrace:
2015-12-22 12:46:43.193 INFO 5720 --- [ main] fhirepsos.ws.Server : Starting Server on HarisPC with PID 5720 (C:\Users\Haris\workspace\FHIRtoepSOSConversion\target\classes started by Haris in C:\Users\Haris\workspace\FHIRtoepSOSConversion)
2015-12-22 12:46:43.197 INFO 5720 --- [ main] fhirepsos.ws.Server : No profiles are active
2015-12-22 12:46:43.260 INFO 5720 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext#31f924f5: startup date [Tue Dec 22 12:46:43 EET 2015]; root of context hierarchy
2015-12-22 12:46:44.007 INFO 5720 --- [ main] o.s.b.f.s.DefaultListableBeanFactory : Overriding bean definition for bean 'beanNameViewResolver' with a different definition: replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]]
2015-12-22 12:46:44.735 INFO 5720 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 9001 (http)
2015-12-22 12:46:44.750 INFO 5720 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2015-12-22 12:46:44.751 INFO 5720 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.0.28
2015-12-22 12:46:44.865 INFO 5720 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2015-12-22 12:46:44.866 INFO 5720 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1610 ms
2015-12-22 12:46:45.161 INFO 5720 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2015-12-22 12:46:45.166 INFO 5720 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2015-12-22 12:46:45.166 INFO 5720 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2015-12-22 12:46:45.167 INFO 5720 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2015-12-22 12:46:45.167 INFO 5720 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2015-12-22 12:46:45.393 INFO 5720 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for #ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext#31f924f5: startup date [Tue Dec 22 12:46:43 EET 2015]; root of context hierarchy
2015-12-22 12:46:45.467 INFO 5720 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2015-12-22 12:46:45.468 INFO 5720 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest)
2015-12-22 12:46:45.499 INFO 5720 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-12-22 12:46:45.499 INFO 5720 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-12-22 12:46:45.539 INFO 5720 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-12-22 12:46:45.726 INFO 5720 --- [ main] org.mongodb.driver.cluster : Cluster created with settings {hosts=[localhost:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
2015-12-22 12:46:45.796 INFO 5720 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2015-12-22 12:46:45.874 INFO 5720 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 9001 (http)
2015-12-22 12:46:45.878 INFO 5720 --- [ main] fhirepsos.ws.Server : Started Server in 3.033 seconds (JVM running for 3.383)
2015-12-22 12:46:46.764 INFO 5720 --- [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-3.2.0.jar:na]
at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:114) ~[mongo-java-driver-3.2.0.jar:na]
at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:128) ~[mongo-java-driver-3.2.0.jar:na]
at java.lang.Thread.run(Unknown Source) [na:1.8.0_65]
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_65]
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source) ~[na:1.8.0_65]
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) ~[na:1.8.0_65]
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source) ~[na:1.8.0_65]
at java.net.AbstractPlainSocketImpl.connect(Unknown Source) ~[na:1.8.0_65]
at java.net.PlainSocketImpl.connect(Unknown Source) ~[na:1.8.0_65]
at java.net.SocksSocketImpl.connect(Unknown Source) ~[na:1.8.0_65]
at java.net.Socket.connect(Unknown Source) ~[na:1.8.0_65]
at com.mongodb.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:50) ~[mongo-java-driver-3.2.0.jar:na]
at com.mongodb.connection.SocketStream.open(SocketStream.java:58) ~[mongo-java-driver-3.2.0.jar:na]
... 3 common frames omitted
This is my pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>fhirepsos.ws</groupId>
<artifactId>FHIRtoepSOSConversion</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>FHIR to epSOS Conversion</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.0.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mongodb</groupId>
<artifactId>mongo-java-driver</artifactId>
<version>3.2.0</version>
</dependency>
<dependency>
<groupId>ca.uhn.hapi.fhir</groupId>
<artifactId>hapi-fhir-base</artifactId>
<version>1.3</version>
</dependency>
<dependency>
<groupId>ca.uhn.hapi.fhir</groupId>
<artifactId>hapi-fhir-structures-dstu2</artifactId>
<version>1.3</version>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-releases</id>
<url>https://repo.spring.io/libs-release</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-releases</id>
<url>https://repo.spring.io/libs-release</url>
</pluginRepository>
</pluginRepositories>
</project>
Finally I have to state that despite the exception the program works fine
Thanks in advance!

Answer 1

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

Answer 2

In some cases, if you are using reactive you also need to remove MongoReactiveAutoConfiguration
spring:
autoconfigure:
exclude:
- org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration
- org.springframework.boot.autoconfigure.mongo.MongoReactiveAutoConfiguration

Answer 3

Spring boot throws this exception when Mongo DB is not running. Please make sure that Mongodb is running. It got resolved for me after starting Mongo DB.

Answer 4

for springboot, you should add following config to your application.property
spring.data.mongodb.host=localhost(your mongo server)
spring.data.mongodb.port=27017(mongo port)