OpenStream throws IOException in AsyncTask





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Context:
I'm developing an Android weather application in Java for a course. This application uses asynctask in order to get from OpenWeather's API the temperature of a city. The API returns a JSON with weather information through an URL like this:



http://api.openweathermap.org/data/2.5/weather?q={city name}&appid={key}


APPID is a key associated to an account in OpenWeather. Here is a JSON example for Berlin city:



{"coord":{"lon":13.39,"lat":52.52},"weather":[{"id":800,"main":"Clear","description":"clear sky","icon":"01d"}],"base":"stations","main":{"temp":8.49,"pressure":1035,"humidity":61,"temp_min":8,"temp_max":9},"visibility":10000,"wind":{"speed":6.7,"deg":120},"clouds":{"all":0},"dt":1542369000,"sys":{"type":1,"id":4892,"message":0.0027,"country":"DE","sunrise":1542349837,"sunset":1542381079},"id":2950159,"name":"Berlin","cod":200}


If the city doesn't exists, the API returns a JSON with error 404. The next one is a JSON example for the nonexistent city Berlina.



{"cod":"404","message":"city not found"}


I get the JSON with Asynctask. In doInBackground() method, I call the following line in order to get an inputStream:



InputStream inputStream = new URL(url).openStream();


Then, I parse the JSON in postOnExecute() and show the temperature information with a Toast.



My question:
The code works fine with Berlin, but openStream throws IOException for Berlina. The URL exists and have JSON data, as I explained. So, what could be the reasons for this Exception? Could it be a connection problem?



Edit with Logcat
This is the exception detail:



11-27 00:01:34.151 3152-3346/com.androidapps.user.weatherapp D/IOException: http://api.openweathermap.org/data/2.5/weather?q=Berlina&units=metric&appid=d32068a850405b593a87d410fcc50a4f
11-27 00:01:34.151 3152-3346/com.androidapps.user.weatherapp W/System.err: java.io.FileNotFoundException: http://api.openweathermap.org/data/2.5/weather?q=Berlina&units=metric&appid=d32068a850405b593a87d410fcc50a4f
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:206)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.net.URL.openStream(URL.java:470)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at com.androidapps.user.weatherapp.MainActivity$GetJSONOpenWeather.doInBackground(MainActivity.java:219)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at com.androidapps.user.weatherapp.MainActivity$GetJSONOpenWeather.doInBackground(MainActivity.java:204)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:292)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.lang.Thread.run(Thread.java:818)
11-27 00:01:34.192 3152-3180/com.androidapps.user.weatherapp D/EGL_emulation: eglMakeCurrent: 0xb42b9b20: ver 2 0
11-27 00:01:34.227 3152-3152/com.androidapps.user.weatherapp D/JSONObjetc: End of input at character 0 of









share|improve this question

























  • What is the exception? Your log should show it unless you're swallowing it.

    – nasch
    Nov 16 '18 at 15:21











  • How can I know what is the exception reason? The getMessage() method of IOException shows only the URL.

    – JCMiguel
    Nov 16 '18 at 15:32






  • 1





    Exception.printStackTrace()

    – nasch
    Nov 16 '18 at 15:34











  • It throws java.io.FileNotFoundException in the URL, but I understand it. I see in the browser that the JSON with the error exists.

    – JCMiguel
    Nov 21 '18 at 23:16













  • I read the next paragraph about the exception in the documentation: "It will also be thrown by these constructors if the file does exist but for some reason is inaccessible, for example when an attempt is made to open a read-only file for writing". So, the JSON is inaccesible for the app. Why?

    – JCMiguel
    Nov 21 '18 at 23:21




















0















Context:
I'm developing an Android weather application in Java for a course. This application uses asynctask in order to get from OpenWeather's API the temperature of a city. The API returns a JSON with weather information through an URL like this:



http://api.openweathermap.org/data/2.5/weather?q={city name}&appid={key}


APPID is a key associated to an account in OpenWeather. Here is a JSON example for Berlin city:



{"coord":{"lon":13.39,"lat":52.52},"weather":[{"id":800,"main":"Clear","description":"clear sky","icon":"01d"}],"base":"stations","main":{"temp":8.49,"pressure":1035,"humidity":61,"temp_min":8,"temp_max":9},"visibility":10000,"wind":{"speed":6.7,"deg":120},"clouds":{"all":0},"dt":1542369000,"sys":{"type":1,"id":4892,"message":0.0027,"country":"DE","sunrise":1542349837,"sunset":1542381079},"id":2950159,"name":"Berlin","cod":200}


If the city doesn't exists, the API returns a JSON with error 404. The next one is a JSON example for the nonexistent city Berlina.



{"cod":"404","message":"city not found"}


I get the JSON with Asynctask. In doInBackground() method, I call the following line in order to get an inputStream:



InputStream inputStream = new URL(url).openStream();


Then, I parse the JSON in postOnExecute() and show the temperature information with a Toast.



My question:
The code works fine with Berlin, but openStream throws IOException for Berlina. The URL exists and have JSON data, as I explained. So, what could be the reasons for this Exception? Could it be a connection problem?



Edit with Logcat
This is the exception detail:



11-27 00:01:34.151 3152-3346/com.androidapps.user.weatherapp D/IOException: http://api.openweathermap.org/data/2.5/weather?q=Berlina&units=metric&appid=d32068a850405b593a87d410fcc50a4f
11-27 00:01:34.151 3152-3346/com.androidapps.user.weatherapp W/System.err: java.io.FileNotFoundException: http://api.openweathermap.org/data/2.5/weather?q=Berlina&units=metric&appid=d32068a850405b593a87d410fcc50a4f
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:206)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.net.URL.openStream(URL.java:470)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at com.androidapps.user.weatherapp.MainActivity$GetJSONOpenWeather.doInBackground(MainActivity.java:219)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at com.androidapps.user.weatherapp.MainActivity$GetJSONOpenWeather.doInBackground(MainActivity.java:204)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:292)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.lang.Thread.run(Thread.java:818)
11-27 00:01:34.192 3152-3180/com.androidapps.user.weatherapp D/EGL_emulation: eglMakeCurrent: 0xb42b9b20: ver 2 0
11-27 00:01:34.227 3152-3152/com.androidapps.user.weatherapp D/JSONObjetc: End of input at character 0 of









share|improve this question

























  • What is the exception? Your log should show it unless you're swallowing it.

    – nasch
    Nov 16 '18 at 15:21











  • How can I know what is the exception reason? The getMessage() method of IOException shows only the URL.

    – JCMiguel
    Nov 16 '18 at 15:32






  • 1





    Exception.printStackTrace()

    – nasch
    Nov 16 '18 at 15:34











  • It throws java.io.FileNotFoundException in the URL, but I understand it. I see in the browser that the JSON with the error exists.

    – JCMiguel
    Nov 21 '18 at 23:16













  • I read the next paragraph about the exception in the documentation: "It will also be thrown by these constructors if the file does exist but for some reason is inaccessible, for example when an attempt is made to open a read-only file for writing". So, the JSON is inaccesible for the app. Why?

    – JCMiguel
    Nov 21 '18 at 23:21
















0












0








0


0






Context:
I'm developing an Android weather application in Java for a course. This application uses asynctask in order to get from OpenWeather's API the temperature of a city. The API returns a JSON with weather information through an URL like this:



http://api.openweathermap.org/data/2.5/weather?q={city name}&appid={key}


APPID is a key associated to an account in OpenWeather. Here is a JSON example for Berlin city:



{"coord":{"lon":13.39,"lat":52.52},"weather":[{"id":800,"main":"Clear","description":"clear sky","icon":"01d"}],"base":"stations","main":{"temp":8.49,"pressure":1035,"humidity":61,"temp_min":8,"temp_max":9},"visibility":10000,"wind":{"speed":6.7,"deg":120},"clouds":{"all":0},"dt":1542369000,"sys":{"type":1,"id":4892,"message":0.0027,"country":"DE","sunrise":1542349837,"sunset":1542381079},"id":2950159,"name":"Berlin","cod":200}


If the city doesn't exists, the API returns a JSON with error 404. The next one is a JSON example for the nonexistent city Berlina.



{"cod":"404","message":"city not found"}


I get the JSON with Asynctask. In doInBackground() method, I call the following line in order to get an inputStream:



InputStream inputStream = new URL(url).openStream();


Then, I parse the JSON in postOnExecute() and show the temperature information with a Toast.



My question:
The code works fine with Berlin, but openStream throws IOException for Berlina. The URL exists and have JSON data, as I explained. So, what could be the reasons for this Exception? Could it be a connection problem?



Edit with Logcat
This is the exception detail:



11-27 00:01:34.151 3152-3346/com.androidapps.user.weatherapp D/IOException: http://api.openweathermap.org/data/2.5/weather?q=Berlina&units=metric&appid=d32068a850405b593a87d410fcc50a4f
11-27 00:01:34.151 3152-3346/com.androidapps.user.weatherapp W/System.err: java.io.FileNotFoundException: http://api.openweathermap.org/data/2.5/weather?q=Berlina&units=metric&appid=d32068a850405b593a87d410fcc50a4f
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:206)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.net.URL.openStream(URL.java:470)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at com.androidapps.user.weatherapp.MainActivity$GetJSONOpenWeather.doInBackground(MainActivity.java:219)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at com.androidapps.user.weatherapp.MainActivity$GetJSONOpenWeather.doInBackground(MainActivity.java:204)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:292)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.lang.Thread.run(Thread.java:818)
11-27 00:01:34.192 3152-3180/com.androidapps.user.weatherapp D/EGL_emulation: eglMakeCurrent: 0xb42b9b20: ver 2 0
11-27 00:01:34.227 3152-3152/com.androidapps.user.weatherapp D/JSONObjetc: End of input at character 0 of









share|improve this question
















Context:
I'm developing an Android weather application in Java for a course. This application uses asynctask in order to get from OpenWeather's API the temperature of a city. The API returns a JSON with weather information through an URL like this:



http://api.openweathermap.org/data/2.5/weather?q={city name}&appid={key}


APPID is a key associated to an account in OpenWeather. Here is a JSON example for Berlin city:



{"coord":{"lon":13.39,"lat":52.52},"weather":[{"id":800,"main":"Clear","description":"clear sky","icon":"01d"}],"base":"stations","main":{"temp":8.49,"pressure":1035,"humidity":61,"temp_min":8,"temp_max":9},"visibility":10000,"wind":{"speed":6.7,"deg":120},"clouds":{"all":0},"dt":1542369000,"sys":{"type":1,"id":4892,"message":0.0027,"country":"DE","sunrise":1542349837,"sunset":1542381079},"id":2950159,"name":"Berlin","cod":200}


If the city doesn't exists, the API returns a JSON with error 404. The next one is a JSON example for the nonexistent city Berlina.



{"cod":"404","message":"city not found"}


I get the JSON with Asynctask. In doInBackground() method, I call the following line in order to get an inputStream:



InputStream inputStream = new URL(url).openStream();


Then, I parse the JSON in postOnExecute() and show the temperature information with a Toast.



My question:
The code works fine with Berlin, but openStream throws IOException for Berlina. The URL exists and have JSON data, as I explained. So, what could be the reasons for this Exception? Could it be a connection problem?



Edit with Logcat
This is the exception detail:



11-27 00:01:34.151 3152-3346/com.androidapps.user.weatherapp D/IOException: http://api.openweathermap.org/data/2.5/weather?q=Berlina&units=metric&appid=d32068a850405b593a87d410fcc50a4f
11-27 00:01:34.151 3152-3346/com.androidapps.user.weatherapp W/System.err: java.io.FileNotFoundException: http://api.openweathermap.org/data/2.5/weather?q=Berlina&units=metric&appid=d32068a850405b593a87d410fcc50a4f
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:206)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.net.URL.openStream(URL.java:470)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at com.androidapps.user.weatherapp.MainActivity$GetJSONOpenWeather.doInBackground(MainActivity.java:219)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at com.androidapps.user.weatherapp.MainActivity$GetJSONOpenWeather.doInBackground(MainActivity.java:204)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:292)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
11-27 00:01:34.152 3152-3346/com.androidapps.user.weatherapp W/System.err: at java.lang.Thread.run(Thread.java:818)
11-27 00:01:34.192 3152-3180/com.androidapps.user.weatherapp D/EGL_emulation: eglMakeCurrent: 0xb42b9b20: ver 2 0
11-27 00:01:34.227 3152-3152/com.androidapps.user.weatherapp D/JSONObjetc: End of input at character 0 of






android json android-asynctask






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share|improve this question













share|improve this question




share|improve this question








edited Nov 27 '18 at 0:11







JCMiguel

















asked Nov 16 '18 at 15:15









JCMiguelJCMiguel

638




638













  • What is the exception? Your log should show it unless you're swallowing it.

    – nasch
    Nov 16 '18 at 15:21











  • How can I know what is the exception reason? The getMessage() method of IOException shows only the URL.

    – JCMiguel
    Nov 16 '18 at 15:32






  • 1





    Exception.printStackTrace()

    – nasch
    Nov 16 '18 at 15:34











  • It throws java.io.FileNotFoundException in the URL, but I understand it. I see in the browser that the JSON with the error exists.

    – JCMiguel
    Nov 21 '18 at 23:16













  • I read the next paragraph about the exception in the documentation: "It will also be thrown by these constructors if the file does exist but for some reason is inaccessible, for example when an attempt is made to open a read-only file for writing". So, the JSON is inaccesible for the app. Why?

    – JCMiguel
    Nov 21 '18 at 23:21





















  • What is the exception? Your log should show it unless you're swallowing it.

    – nasch
    Nov 16 '18 at 15:21











  • How can I know what is the exception reason? The getMessage() method of IOException shows only the URL.

    – JCMiguel
    Nov 16 '18 at 15:32






  • 1





    Exception.printStackTrace()

    – nasch
    Nov 16 '18 at 15:34











  • It throws java.io.FileNotFoundException in the URL, but I understand it. I see in the browser that the JSON with the error exists.

    – JCMiguel
    Nov 21 '18 at 23:16













  • I read the next paragraph about the exception in the documentation: "It will also be thrown by these constructors if the file does exist but for some reason is inaccessible, for example when an attempt is made to open a read-only file for writing". So, the JSON is inaccesible for the app. Why?

    – JCMiguel
    Nov 21 '18 at 23:21



















What is the exception? Your log should show it unless you're swallowing it.

– nasch
Nov 16 '18 at 15:21





What is the exception? Your log should show it unless you're swallowing it.

– nasch
Nov 16 '18 at 15:21













How can I know what is the exception reason? The getMessage() method of IOException shows only the URL.

– JCMiguel
Nov 16 '18 at 15:32





How can I know what is the exception reason? The getMessage() method of IOException shows only the URL.

– JCMiguel
Nov 16 '18 at 15:32




1




1





Exception.printStackTrace()

– nasch
Nov 16 '18 at 15:34





Exception.printStackTrace()

– nasch
Nov 16 '18 at 15:34













It throws java.io.FileNotFoundException in the URL, but I understand it. I see in the browser that the JSON with the error exists.

– JCMiguel
Nov 21 '18 at 23:16







It throws java.io.FileNotFoundException in the URL, but I understand it. I see in the browser that the JSON with the error exists.

– JCMiguel
Nov 21 '18 at 23:16















I read the next paragraph about the exception in the documentation: "It will also be thrown by these constructors if the file does exist but for some reason is inaccessible, for example when an attempt is made to open a read-only file for writing". So, the JSON is inaccesible for the app. Why?

– JCMiguel
Nov 21 '18 at 23:21







I read the next paragraph about the exception in the documentation: "It will also be thrown by these constructors if the file does exist but for some reason is inaccessible, for example when an attempt is made to open a read-only file for writing". So, the JSON is inaccesible for the app. Why?

– JCMiguel
Nov 21 '18 at 23:21














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