Getting java net SocketTimeoutException Connection timed out in android

Question

I m relatively new to android development  I m developing an android application where I m sending requests to the web server and parsing JSON objects  Frequently I m getting java net SocketTimeoutException  Connection timed out exception while communicating with the server  Some times it will work perfectly without any problem  I know this same question has been asked in SO many times  But still  I didn t get any satisfying solution to this problem  I m posting my logcat and app-server communication code below  public JSONObject RequestWithHttpUrlConn String  url  String param        HttpURLConnection con   null      URL url      String response    quot  quot       Scanner inStream   null      PrintWriter out   null      try           url   new URL  url           con    HttpURLConnection  url openConnection            con setDoOutput true           con setRequestMethod  quot POST quot            if param    null               con setFixedLengthStreamingMode param getBytes   length                     con setRequestProperty  quot Content-Type quot    quot application x-www-form-urlencoded quot            out   new PrintWriter con getOutputStream             if param    null               out print param                     out flush            out close            inStream   new Scanner con getInputStream              while inStream hasNextLine                 response   inStream nextLine                     catch  MalformedURLException e               TODO Auto-generated catch block         e printStackTrace          catch  IOException e               TODO Auto-generated catch block         e printStackTrace          finally          if con    null               con disconnect             if inStream    null               inStream close             if out    null               out flush                out close                       Logcat  03-25 10 55 32 613  W System err 18868   java net SocketTimeoutException  Connection  timed out 03-25 10 55 32 617  W System err 18868  at org apache harmony luni platform OSNetworkSystem connect Native Method  03-25 10 55 32 617  W System err 18868  at dalvik system BlockGuard  WrappedNetworkSystem connect BlockGuard java 357  03-25 10 55 32 617  W System err 18868  at  org apache harmony luni net PlainSocketImpl connect PlainSocketImpl java 204  03-25 10 55 32 617  W System err 18868  at  org apache harmony luni net PlainSocketImpl connect PlainSocketImpl java 437  03-25 10 55 32 617  W System err 18868  at        java net Socket connect Socket java 1002  03-25 10 55 32 621  W System err 18868  at  org apache harmony luni internal net www protocol http HttpConnection  lt init gt   HttpConnection java 75  03-25 10 55 32 621  W System err 18868   at  org apache harmony luni internal net www protocol http HttpConnection  lt init gt   HttpConnection java 48 03-25 10 55 32 624  W System err 18868  at  org apache harmony luni internal net www protocol http HttpConnection Address connect  HttpConnection java 322 03-25 10 55 32 624  W System err 18868  at  org apache harmony luni internal net www protocol http HttpConnectionPool get  HttpConnectionPool java 89 03-25 10 55 32 628  W System err 18868  at  org apache harmony luni internal net www protocol http HttpURLConnectionImpl getHttpCon nection HttpURLConnectionImpl java 285  03-25 10 55 32 628  W System err 18868  at     org apache harmony luni internal net www protocol http HttpURLConnectionImpl makeConn ection HttpURLConnectionImpl java 267  03-25 10 55 32 636  W System err 18868  at org apache harmony luni internal net www protocol http HttpURLConnectionImpl connect  HttpURLConnectionImpl java 205  03-25 10 55 32 636  W System err 18868  at  org apache harmony luni internal net www protocol http HttpURLConnectionImpl getOutputS tream HttpURLConnectionImpl java 614  03-25 10 55 32 636  W System err 18868  at  com myapp core JSONRequest RequestWithHttpUrlConn JSONRequest java 63  03-25 10 55 32 636  W System err 18868      at com myapp core DetailPage  AsyncRecBooks doInBackground AKBookDetailView java 265  03-25 10 55 32 640  W System err 18868      at com myapp core DetailPage  AsyncRecBooks doInBackground AKBookDetailView java 1  03-25 10 55 32 640  W System err 18868      at android os AsyncTask 2 call  AsyncTask java 185  03-25 10 55 32 640  W System err 18868      at java util concurrent FutureTask  Sync innerRun FutureTask java 306  03-25 10 55 32 640  W System err 18868      at java util concurrent FutureTask run  FutureTask java 138  03-25 10 55 32 640  W System err 18868      at  java util concurrent ThreadPoolExecutor runWorker ThreadPoolExecutor java 1088  03-25 10 55 32 648  W System err 18868      at  java util concurrent ThreadPoolExecutor Worker run ThreadPoolExecutor java 581  03-25 10 55 32 648  W System err 18868      at java lang Thread run Thread java 1019  03-25 10 55 32 652  E JSON Parser 18868   Error parsing data org json JSONException    End of input at character 0 of   Can anyone help me out to find out a solution for this  Thanks in Advance

User · Answer

If you are testing the server in localhost your Android device must be connected to the same local network  Then the Server URL used by your APP must include your computer IP Address and not the  localhost  mask

User · Answer

I ve searched all over the web and after reading lot of docs regarding connection timeout exception  the thing I understood is that  preventing SocketTimeoutException is beyond our limit  One way to effectively handle it is to define a connection timeout and later handle it by using a try-catch block  Hope this will help anyone in future who are facing the same issue  HttpUrlConnection conn    HttpURLConnection  url openConnection       set the timeout in milliseconds conn setConnectTimeout 7000

User · Answer

I got this same error as I mistakenly changed the order of the statements   OkHttpClient okHttpClient   new OkHttpClient   newBuilder    connectTimeout 20  TimeUnit SECONDS  readTimeout 20 TimeUnit SECONDS  writeTimeout 20  TimeUnit SECONDS   build      After changing the order of writeTimeout and readTimeout  the error resolved  The final code I used is given below   OkHttpClient okHttpClient   new OkHttpClient Builder   connectTimeout 60  TimeUnit SECONDS                       writeTimeout 60  TimeUnit SECONDS                       readTimeout 60  TimeUnit SECONDS                       build

User · Answer

I m aware this question is a bit old  But since I stumbled on this while doing research  I thought a little addition might be helpful   As stated the error cannot be solved by the client  since it is a network related issue  However  what you can do is retry connecting a few times  This may work as a workaround until the real issue is fixed   for  int retries   0  retries  lt  3  retries          try           final HttpClient client   createHttpClientWithDefaultSocketFactory null  null           final HttpResponse response   client execute get           final int statusCode   response getStatusLine   getStatusCode            if  statusCode    200                throw new IllegalStateException  GET Request on      get getURI   toString        resulted in     statusCode             else                               return response getEntity                    catch  final java net SocketTimeoutException e               connection timed out   let s try again                           Maybe this helps someone

User · Answer

I was facing this problem and the solution was to restart my modem  router   I could get connection for my app to internet after that   I think the library I am using is not managing connections properly because it happeend just few times

User · Answer

public JSONObject RequestWithHttpUrlConn String  url  String param        HttpURLConnection con   null      URL url      String response           Scanner inStream   null      PrintWriter out   null      try           url   new URL  url           con    HttpURLConnection  url openConnection            con setDoOutput true           con setRequestMethod  POST            if param    null               con setFixedLengthStreamingMode param getBytes   length                     con setRequestProperty  Content-Type    application x-www-form-urlencoded            out   new PrintWriter con getOutputStream             if param    null               out print param                     out flush            out close            inStream   new Scanner con getInputStream              while inStream hasNextLine                 response   inStream nextLine                     catch  MalformedURLException e               TODO Auto-generated catch block         e printStackTrace          catch  IOException e               TODO Auto-generated catch block         e printStackTrace          finally          if con    null               con disconnect             if inStream    null               inStream close             if out    null               out flush                out close

User · Answer

If you are using Kotlin   Retrofit   Coroutines then just use try and catch for network operations like   viewModelScope launch Dispatchers IO            try               val userListResponseModel   apiEndPointsInterface usersList               returnusersList userListResponseModel            catch  e  Exception                e printStackTrace                     Where  Exception is type of kotlin and not of java lang  This will handle every exception like    HttpException SocketTimeoutException FATAL EXCEPTION  DefaultDispatcher etc   Here is my usersList   function   GET AppConstants APIEndPoints HOME CONTENT  suspend fun usersList    UserListResponseModel   Note   Your RetrofitClient Classs must have this as client  OkHttpClient Builder                connectTimeout 10  TimeUnit SECONDS               readTimeout 10  TimeUnit SECONDS               writeTimeout 10  TimeUnit SECONDS

User · Answer

Set This in OkHttpClient Builder   Object  val httpClient   OkHttpClient Builder           httpClient connectTimeout 5  TimeUnit MINUTES     connect timeout              writeTimeout 5  TimeUnit MINUTES     write timeout              readTimeout 5  TimeUnit MINUTES     read timeout

User · Answer

I faced the same problem when connecting to EC2  the issue was with Security Group  I solved by adding the allowed IPs at port 5432

[java] Getting java.net.SocketTimeoutException: Connection timed out in android

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