I have some IPv6-only hosts. I can successfully execute curl request to it by curl
$ curl -I my.ip.v6.only.host HTTP/1.1 200 OK
But when I trying to get it from java I have an error:
HttpGet httpget = new HttpGet("http://my.ip.v6.only.host");
CloseableHttpResponse response = httpclient.execute(httpget);
Stack trace:
INFO: I/O exception (java.net.NoRouteToHostException) caught when processing request to {}->http://my.ip.v6.only.host: No route to host
Mar 17, 2015 7:42:23 PM org.apache.http.impl.execchain.RetryExec execute
INFO: Retrying request to {}->http://my.ip.v6.only.host
java.net.NoRouteToHostException: No route to host
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:72)
at org.apache.http.impl.conn.HttpClientConnectionOperator.connect(HttpClientConnectionOperator.java:123)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:318)
at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:363)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:219)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:195)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:86)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:108)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)
at MainTest.main(MainTest.java:25)
Problem has been occured on java v1.7.0_65 and v1.8.0_40, MacOS 10.10.2. On previous version MacOS 10.9.5 it works well.
What's going on? How it is possible that host is reachable by curl and unreachable from java.
Also, I've tried to play around -Djava.net.preferIPv6Addresses=true and -Djava.net.preferIPv4Stack=false and it couldn't help.