Catching Exception in java to make application continue its execution

Question

This is what i have right now, this method open's a connection with http url,

public static void setCameraList(String list) {
        URL calculator;
        try {   
    String url = "http://example.com/index.php?cameraList=" +URLEncoder.encode(list, "ISO-8859-1");
            calculator = new URL(url);
            URLConnection calcConnection = calculator.openConnection();
             BufferedReader streamReader = new BufferedReader(new InputStreamReader(calcConnection.getInputStream()));
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        catch (Exception e) {
                    e.printStackTrace();
        }
    }

This work's fine, but sometimes when url is unreachable or return's some error code this method seem's to crash full app.

What i am curious about is, Why this method fails to catch Exception ?

Also, If i add this :

            catch(Throwable th){

            }

Will this method catch every possible error/exception related to what operation's i perform inside it ?

if it is a runtime exception then you need to catch a runtime exception exlicitly... — Anubhab, Mar 28 '13 at 18:02
yes i am sure.. i tested by making that url respond with an error.. — XTop, Mar 28 '13 at 18:03
@HotLicks That means.. if i catch `Throwable` it will be swallowed inside this method and will never be passed into it's calling method.. — XTop, Mar 28 '13 at 18:07
If you swallow, eg, an OutOfMemoryError, you're not going to get very far. Swallowing the exception/error does not correct the errant condition. — Hot Licks, Mar 28 '13 at 18:16
What do you mean by "seem's to crash full app"? What does this "crash" look like? — JimmyB, Mar 28 '13 at 18:27

score 4 · Answer 1 · edited May 23 '17 at 11:58

4

I'm not a Java expert, but you should consider that there is a difference between exception and error. Did you have a look here?

May you post the stacktrace? Thank you

edited May 23 '17 at 11:58

Community

1
1

answered Mar 28 '13 at 18:01

gpicchiarelli

454
6
16

score 0 · Answer 2 · answered Mar 28 '13 at 18:06

0

If you add this : catch(Throwable th){ } every single exception your method throws will be catch. In order to resolve your problem properly, you must pay atention about what type of exception is thrown when the problem you are describing happens!

answered Mar 28 '13 at 18:06

Jeyvison

190
1
14

1

As the name suggests, *anything* that can be `throw`n is by definition an instance of `Throwable` (or `null`). Catching `Throwable` will thus catch anything that can be caught at all. – JimmyB Mar 28 '13 at 18:30

Catching Exception in java to make application continue its execution

2 Answers2