UnknownHostException 에러
1. 원인
- 기본적으로 네트워크 연결이 되지 않을 경우 호스트 접속 시도 할 경우
- 폐쇄망 호스트 연결 시도 할 경우 해당 폐쇄망이 아닌 네트워크에 연결 되어 있을 경우 에러 발생
[java.net.UnknownHostException: Unable to resolve host "https://json8.tistory.com/": No address associated with hostname]
2020-06-09 14:50:15.304 29906-30440/com.json.example:service W/System.err: java.net.UnknownHostException: Unable to resolve host "https://json8.tistory.com": No address associated with hostname
2020-06-09 14:50:15.304 29906-30440/com.json.example:service W/System.err: at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:157)
2020-06-09 14:50:15.304 29906-30440/com.json.example:service W/System.err: at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:105)
2020-06-09 14:50:15.304 29906-30440/com.json.example:service W/System.err: at java.net.InetAddress.getAllByName(InetAddress.java:1154)
2020-06-09 14:50:15.304 29906-30440/com.json.example:service W/System.err: at com.android.okhttp.Dns$1.lookup(Dns.java:39)
2020-06-09 14:50:15.304 29906-30440/com.json.example:service W/System.err: at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:175)
2020-06-09 14:50:15.304 29906-30440/com.json.example:service W/System.err: at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:141)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:83)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:174)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:126)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:95)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:281)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:224)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:461)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:127)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:258)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: at com.json.example.service.b$a.run(HTTPFileUpload.java:12)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: Caused by: android.system.GaiException: android_getaddrinfo failed: EAI_NODATA (No address associated with hostname)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: at libcore.io.Linux.android_getaddrinfo(Native Method)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: at libcore.io.BlockGuardOs.android_getaddrinfo(BlockGuardOs.java:172)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:137)
2020-06-09 14:50:15.305 29906-30440/com.json.example:service W/System.err: ... 15 more
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