MongoDb + Java驅動程序出現奇怪的錯誤

Question

我正在使用MongoDb作為數據庫來構建Resteasy服務。

它可以在我的Mac上完美運行，但在測試服務器的Fedora 15上，則會引發如下錯誤：

    07:20:15,060 WARNING [com.mongodb.tcp] (http--0.0.0.0-8000-1) Exception determining maxBSON size using0: java.io.IOException: couldn't connect to [eid/67.215.65.132:27017] bc:java.net.ConnectException: Connection timed out
    at com.mongodb.DBPort._open(DBPort.java:228) [mongo-2.7.0.jar:]
    at com.mongodb.DBPort.go(DBPort.java:112) [mongo-2.7.0.jar:]
    at com.mongodb.DBPort.go(DBPort.java:93) [mongo-2.7.0.jar:]
    at com.mongodb.DBPort.findOne(DBPort.java:146) [mongo-2.7.0.jar:]
    at com.mongodb.DBPort.runCommand(DBPort.java:157) [mongo-2.7.0.jar:]
    at com.mongodb.DBTCPConnector.fetchMaxBsonObjectSize(DBTCPConnector.java:457) [mongo-2.7.0.jar:]
    at com.mongodb.DBTCPConnector.checkMaster(DBTCPConnector.java:444) [mongo-2.7.0.jar:]
    at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:209) [mongo-2.7.0.jar:]
    at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:305) [mongo-2.7.0.jar:]
    at com.mongodb.DBCursor._check(DBCursor.java:369) [mongo-2.7.0.jar:]
    at com.mongodb.DBCursor._hasNext(DBCursor.java:498) [mongo-2.7.0.jar:]
    at com.mongodb.DBCursor.hasNext(DBCursor.java:523) [mongo-2.7.0.jar:]
    at eid.ariel.TestService.getAllUsers(TestService.java:39) [classes:]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.6.0_22]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [:1.6.0_22]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [:1.6.0_22]
    at java.lang.reflect.Method.invoke(Method.java:616) [:1.6.0_22]
    at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:140) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:255) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:220) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:209) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:519) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:496) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) [resteasy-jaxrs-2.2.1.GA.jar:]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
    at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:139) [jboss-as-web-7.0.2.Final.jar:7.0.2.Final]
    at org.jboss.as.web.NamingValve.invoke(NamingValve.java:57) [jboss-as-web-7.0.2.Final.jar:7.0.2.Final]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:154) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:667) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:952) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
    at java.lang.Thread.run(Thread.java:679) [:1.6.0_22]

訪問db的代碼是：

public List<DBObject> getAllUsers() throws UnknownHostException, MongoException, FileNotFoundException{
    Mongo mongo = new Mongo("localhost");
    DBCollection collection = mongo.getDB("eid_security_dev").getCollection("users");
    DBCursor cur = collection.find();
    List<DBObject> result = new ArrayList<DBObject>();
    while (cur.hasNext()){

        result.add(cur.next());
    }
    return result;
}

使用Mongo驅動程序2.7.0和mongodb服務器2.0.0

Answer 1

java.io.IOException: couldn't connect to [eid/67.215.65.132:27017] bc:java.net.ConnectException: Connection timed out

您的數據庫客戶端似乎無法連接到MongoDB服務器。 需要調查的幾件事：

• 確保您的數據庫服務器已啟動並正在運行。

• 使用mongo shell來驗證您的MongoDB服務器是否可以正常運行。

• 67.215.65.132是公用IP地址。 localhost通常應解析為地址為127.0.0.1或類似地址的回送接口。 嘗試直接使用127.0.0.1 ，因為使用公用IP可能意味着存在防火牆規則，這些規則會阻止對DB服務器端口的訪問。 連接超時而不是被拒絕使這種情況很有可能發生。

Answer 2

看這里 。 例如，您使用的是OpenDNS，它將為未知主機返回此IP。