java.net.ConnectException: Connection refused: connect

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Root Cause Analysis

  1. java.net.ConnectException

    Connection refused: connect

    at java.net.DualStackPlainSocketImpl.connect0()
  2. Java RT
    HttpURLConnection.connect
    1. java.net.DualStackPlainSocketImpl.connect0(Native Method)[?:1.8.0_92]
    2. java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)[?:1.8.0_92]
    3. java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)[?:1.8.0_92]
    4. java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)[?:1.8.0_92]
    5. java.net.AbstractPlainSocketImpl.connect(Unknown Source)[?:1.8.0_92]
    6. java.net.PlainSocketImpl.connect(Unknown Source)[?:1.8.0_92]
    7. java.net.SocksSocketImpl.connect(Unknown Source)[?:1.8.0_92]
    8. java.net.Socket.connect(Unknown Source)[?:1.8.0_92]
    9. java.net.Socket.connect(Unknown Source)[?:1.8.0_92]
    10. sun.net.NetworkClient.doConnect(Unknown Source)[?:1.8.0_92]
    11. sun.net.www.http.HttpClient.openServer(Unknown Source)[?:1.8.0_92]
    12. sun.net.www.http.HttpClient.openServer(Unknown Source)[?:1.8.0_92]
    13. sun.net.www.http.HttpClient.<init>(Unknown Source)[?:1.8.0_92]
    14. sun.net.www.http.HttpClient.New(Unknown Source)[?:1.8.0_92]
    15. sun.net.www.http.HttpClient.New(Unknown Source)[?:1.8.0_92]
    16. sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)[?:1.8.0_92]
    17. sun.net.www.protocol.http.HttpURLConnection.plainConnect0(Unknown Source)[?:1.8.0_92]
    18. sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)[?:1.8.0_92]
    19. sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)[?:1.8.0_92]
    19 frames
  3. net.sf.jabref
    GeneralFetcher.lambda$actionPerformed$4
    1. net.sf.jabref.logic.net.URLDownload.openConnection(URLDownload.java:140)[JabRef-3.4.jar:?]
    2. net.sf.jabref.logic.net.URLDownload.downloadToString(URLDownload.java:157)[JabRef-3.4.jar:?]
    3. net.sf.jabref.logic.net.URLDownload.downloadToString(URLDownload.java:152)[JabRef-3.4.jar:?]
    4. net.sf.jabref.importer.fetcher.GoogleScholarFetcher.runConfig(GoogleScholarFetcher.java:176)[JabRef-3.4.jar:?]
    5. net.sf.jabref.importer.fetcher.GoogleScholarFetcher.processQueryGetPreview(GoogleScholarFetcher.java:96)[JabRef-3.4.jar:?]
    6. net.sf.jabref.importer.fetcher.GeneralFetcher.lambda$actionPerformed$4(GeneralFetcher.java:231)[JabRef-3.4.jar:?]
    6 frames
  4. Java RT
    Thread.run
    1. java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)[?:1.8.0_92]
    2. java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)[?:1.8.0_92]
    3. java.lang.Thread.run(Unknown Source)[?:1.8.0_92]
    3 frames