OpenStream throws IOException in AsyncTask
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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
android json android-asynctask asked Nov 16 '18 at 15:15
JCMiguelJCMiguel
638
|
show 3 more comments
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
asked Nov 16 '18 at 15:15
JCMiguelJCMiguel
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
|
show 3 more comments
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
asked Nov 16 '18 at 15:15
JCMiguelJCMiguel
638
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
asked Nov 16 '18 at 15:15
JCMiguelJCMiguel
638
asked Nov 16 '18 at 15:15
JCMiguelJCMiguel
638
edited Nov 27 '18 at 0:11
JCMiguel
asked Nov 16 '18 at 15:15
JCMiguelJCMiguel
638
asked Nov 16 '18 at 15:15
JCMiguelJCMiguel
638
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
|
show 3 more comments
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
|
show 3 more comments
0
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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