Question

我使用Spring 5 webflux，SpringBoot 2和Reactive MongoDB构建POC。在使用maven插件构建项目时，我收到错误Mongodb连接错误，如下所示： -

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

以下是我的application.properties文件： -

#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

的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>

请告知这里可能出现的问题？我是否需要在我的机器中显式安装MongoDB并在运行此项目之前运行。我相信MongoDB实例将自行运行，因为SpringBoot将在运行时实例化它。

谢谢

Answer 1

1.请从mongo控制台验证mongodb是否由db.version()安装。

2.验证mongo服务状态是否正在运行。

3.如果正在运行，请检查服务端口。

如果三者中的任何一个失败，那么先解决它们。

Answer 2

您可以通过发出以下命令来启动mongod进程：

sudo systemctl启动mongod

如果启动mongod时收到与以下类似的错误：

无法启动mongod.service：找不到单元mongod.service。首先运行以下命令：

sudo systemctl守护程序重新加载然后再次运行上面的启动命令。

2 验证MongoDB已成功启动。 sudo systemctl status mongod

Answer 3

就我而言，我正在使用嵌入式mongo。更改build.gradle后，需要刷新。

解决方案-刷新gradle项目[eclipse中的右键单击项目/与其他IDE相似] 并运行应用程序。

它将下载... mongodb-win32-x86_64或类似文件并正常启动

异常连接被拒绝

3 个答案: