CODEWITHSUNDEEP
springmongodbspring-mongodb
Vinod Kumar
Vinod Kumar

Reputation: 675

Exception connection refused

I'm building a POC using the Spring 5 webflux, SpringBoot 2 and Reactive MongoDB. While building the project using the maven plugin, I'm getting the error Mongodb connection error like following :-

2018-06-11 10:16:35.415  INFO 16040 --- [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.netty.NettyStream$2.operationComplete(NettyStream.java:158) ~[mongodb-driver-core-3.6.3.jar:na]
    at com.mongodb.connection.netty.NettyStream$2.operationComplete(NettyStream.java:145) ~[mongodb-driver-core-3.6.3.jar:na]
    at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:511) ~[netty-common-4.1.24.Final.jar:4.1.24.Final]
    at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:504) ~[netty-common-4.1.24.Final.jar:4.1.24.Final]
    at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:483) ~[netty-common-4.1.24.Final.jar:4.1.24.Final]
    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:424) ~[netty-common-4.1.24.Final.jar:4.1.24.Final]
    at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:121) ~[netty-common-4.1.24.Final.jar:4.1.24.Final]
    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:327) ~[netty-transport-4.1.24.Final.jar:4.1.24.Final]
    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:343) ~[netty-transport-4.1.24.Final.jar:4.1.24.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:633) ~[netty-transport-4.1.24.Final.jar:4.1.24.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580) ~[netty-transport-4.1.24.Final.jar:4.1.24.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497) ~[netty-transport-4.1.24.Final.jar:4.1.24.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459) ~[netty-transport-4.1.24.Final.jar:4.1.24.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) ~[netty-common-4.1.24.Final.jar:4.1.24.Final]
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.24.Final.jar:4.1.24.Final]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_171]
Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: no further information: localhost/127.0.0.1:27017
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[na:1.8.0_171]
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) ~[na:1.8.0_171]
    at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:325) ~[netty-transport-4.1.24.Final.jar:4.1.24.Final]
    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:340) ~[netty-transport-4.1.24.Final.jar:4.1.24.Final]
    ... 7 common frames omitted
Caused by: java.net.ConnectException: Connection refused: no further information
    ... 11 common frames omitted

2018-06-11 10:16:35.824  INFO 16040 --- [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:62) ~[mongodb-driver-core-3.6.3.jar:na]
    at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:126) ~[mongodb-driver-core-3.6.3.jar:na]
    at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:114) ~[mongodb-driver-core-3.6.3.jar:na]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_171]
Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_171]
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_171]
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_171]
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_171]
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_171]
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_171]
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_171]
    at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_171]
    at com.mongodb.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:59) ~[mongodb-driver-core-3.6.3.jar:na]
    at com.mongodb.connection.SocketStream.open(SocketStream.java:57) ~[mongodb-driver-core-3.6.3.jar:na]
    ... 3 common frames omitted

2018-06-11 10:16:35.852  INFO 16040 --- [ctor-http-nio-1] r.ipc.netty.tcp.BlockingNettyContext     : Started HttpServer on /0:0:0:0:0:0:0:0:60327
2018-06-11 10:16:35.855  INFO 16040 --- [           main] o.s.b.web.embedded.netty.NettyWebServer  : Netty started on port(s): 60327

Following is my application.properties file :-

#spring.data.mongodb.uri=mongodb://localhost:27017/webflux_demo

#mongodb
spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=webflux_demo

#logging
logging.level.org.springframework.data=debug
logging.level.=error

Pom.xml:-

<?xml version="1.0" encoding="UTF-8"?>
<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>com.myspringboot.microservice.webflux</groupId>
    <artifactId>spring-webflux</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-webflux</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>io.projectreactor</groupId>
            <artifactId>reactor-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

Please advise what could be the issue here? Do I need to install MongoDB in my machine explicitly and run before running this project. I believe MongoDB instance will run by itself as SpringBoot will instantiate it during the runtime.

Thank you

Upvotes: 1

Views: 14458

Answers (3)

sneha nathani
sneha nathani

Reputation: 11

You can start the mongod process by issuing the following command:

sudo systemctl start mongod

If you receive an error similar to the following when starting mongod:

Failed to start mongod.service: Unit mongod.service not found. Run the following command first:

sudo systemctl daemon-reload Then run the start command above again.

2 Verify that MongoDB has started successfully. sudo systemctl status mongod

Upvotes: 1

Kris Swat
Kris Swat

Reputation: 1006

In my case, I am using embedded mongo. After changing build.gradle, it needs refresh.

Solution - Refresh gradle project [ right click project in eclipse/ similar for other IDE] and run application.

It will download...mongodb-win32-x86_64 or similar and starts normally

Upvotes: 0

Alien
Alien

Reputation: 15878

1.Please verify mongodb is installed by db.version() from mongo console.

2.Verify mongo service status is running or not.

3.If running then check service port.

If any of the three fails then first resolve them.

Upvotes: 2

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