CODEWITHSUNDEEP
javaandroidresttemplate
Elias
Elias

Reputation: 694

I/O error: No route to host; nested exception is java.net.NoRouteToHostException: No route to host

I am getting the above exception when trying to consume restservice using resttemplate in android. the following is the piece of code.

 private class HttpRequestTask extends AsyncTask<Void, Void, ShiftPlannerModel[]> {
    @Override
    protected ShiftPlannerModel[] doInBackground(Void... params) {
        try {
            RestTemplate restTemplate = new RestTemplate();
            restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
            ResponseEntity<ShiftPlannerModel[]> greeting = restTemplate.getForEntity(URL, ShiftPlannerModel[].class);
            Log.i(greeting.getBody().toString(), "doInBackground: ");
            return greeting.getBody();
        } catch (Exception e) {
            Log.e("doInBackgrouExcp", e.getMessage(), e);
        }

        return null;
    }

NOTE: rest service is up and running in local machine

enter image description here

The following is the full stack trace: 4-19 00:56:21.260 11743-11794/com.example.admin.myapplication E/doInBackgrouExcp: I/O error: No route to host; nested exception is java.net.NoRouteToHostException: No route to host org.springframework.web.client.ResourceAccessException: I/O error: No route to host; nested exception is java.net.NoRouteToHostException: No route to host at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:491) at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:439) at org.springframework.web.client.RestTemplate.getForEntity(RestTemplate.java:259) at com.example.admin.myapplication.MainActivity$HttpRequestTask.doInBackground(MainActivity.java:132) at com.example.admin.myapplication.MainActivity$HttpRequestTask.doInBackground(MainActivity.java:126) at android.os.AsyncTask$2.call(AsyncTask.java:304) at java.util.concurrent.FutureTask.run(FutureTask.java:237) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607) at java.lang.Thread.run(Thread.java:762) Caused by: java.net.NoRouteToHostException: No route to host at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:334) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:196) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:356) at java.net.Socket.connect(Socket.java:586) at com.android.okhttp.internal.Platform.connectSocket(Platform.java:113) at com.android.okhttp.Connection.connectSocket(Connection.java:1455) at com.android.okhttp.Connection.connect(Connection.java:1413) at com.android.okhttp.Connection.connectAndSetOwner(Connection.java:1700) at com.android.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:133) at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:466) at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:371) at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:503) at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:130) at org.springframework.http.client.SimpleBufferingClientHttpRequest.executeInternal(SimpleBufferingClientHttpRequest.java:72) at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:46) at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:63) at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:476) at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:439)  at org.springframework.web.client.RestTemplate.getForEntity(RestTemplate.java:259)  at com.example.admin.myapplication.MainActivity$HttpRequestTask.doInBackground(MainActivity.java:132)  at com.example.admin.myapplication.MainActivity$HttpRequestTask.doInBackground(MainActivity.java:126)  at android.os.AsyncTask$2.call(AsyncTask.java:304)  at java.util.concurrent.FutureTask.run(FutureTask.java:237)  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)  at java.lang.Thread.run(Thread.java:762)  04-19 00:56:21.261 11743-11743/com.example.admin.myapplication D/AndroidRuntime: Shutting down VM 04-19 00:56:21.261 11743-11743/com.example.admin.myapplication E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.admin.myapplication, PID: 11743 java.lang.NullPointerException: Attempt to get length of null array at com.example.admin.myapplication.MainActivity$HttpRequestTask.onPostExecute(MainActivity.java:151) at com.example.admin.myapplication.MainActivity$HttpRequestTask.onPostExecute(MainActivity.java:126) at android.os.AsyncTask.finish(AsyncTask.java:660) at android.os.AsyncTask.-wrap1(AsyncTask.java) at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:677) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6776) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1518) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)

Upvotes: 1

Views: 17917

Answers (1)

M. le Rutte
M. le Rutte

Reputation: 3563

The exception means exactly what it says: your OS has no network route to the destination. It can translate the hostname to an ip address, but when it tries to contact that destination there is no route.

Given that localhost is always routable my impression is that the service your code is trying to connect to is not localhost but some other service. If you would have included the full stacktrace it would have become apparent.

If you are trying to connect to a service running on your development machine from the Android running environment you need to setup networking on the emulator.

Upvotes: 4

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