java.lang.IllegalArgumentException: protocol = http host = null

问题

For this link http://bits.blogs.nytimes.com/2014/09/02/uber-banned-across-germany-by-frankfurt-court/?partner=rss&emc=rss this code doesn`t work but if I put another for exemple: https://www.google.com everything is ok:

    URL url = new URL("http://bits.blogs.nytimes.com/2014/09/02/uber-banned-across-germany-by-frankfurt-court/?partner=rss&emc=rss");
        URLConnection uc;
    uc = url.openConnection();
    uc.setRequestProperty("User-Agent", "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_7; en-US) AppleWebKit/534.16 (KHTML, like Gecko) Chrome/10.0.648.205 Safari/534.16");
    uc.addRequestProperty("referer", "http://www.facebook.com");
    uc.connect();     

    this.input = uc.getInputStream();

I get this exception:

java.lang.IllegalArgumentException: protocol = http host = null
    at sun.net.spi.DefaultProxySelector.select(DefaultProxySelector.java:170)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:926)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:850)
    at sun.net.www.protocol.http.HttpURLConnection.followRedirect(HttpURLConnection.java:2398)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1557)
    at UrlParser.<init>(UrlParser.java:48)
    at TikaParser.test_url_parser(TikaParser.java:186)
    at TikaParser.run(TikaParser.java:256)
    at java.lang.Thread.run(Thread.java:745)

what is wrong with my code?

回答1:

I encountered this same exception when the URL started with http:/ instead of http://. e.g. http:/www.example.com

This was in the org.springframework.web.client.RestTemplate.exchange() method, so it's not quite the same context, but maybe a similar issue.

回答2:

Mostly this error occur due to incorrect url. Make sure the Url that you are hitting is correct.As wsams mentioned try to check the // in your url if it is correct or not. Correct pattern is http://localhost:8080

回答3:

Looks like your proxy host is not set. Try setting it, then it should work.

See this page for more information on proxy properties.

来源：https://stackoverflow.com/questions/25642104/java-lang-illegalargumentexception-protocol-http-host-null

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java

url

apache-tika