Unable to handle Custom Exception Java

Question

I know this type of questions have come before, and I have went threw them, but didn't get the final part which I need to do.

My ExceptionClass

public class ProException extends Exception {
/**
 * 
 */
private static final long serialVersionUID = 1L;

public ProException(String message) {
    super(message);
  }
}

My ActivityClass (Custom Adapter in Android for ListView)

public View getView(int position, View convertView, ViewGroup parent) {
    View vi = convertView;
    try {
        if (convertView == null) {
            vi = inflater.inflate(R.layout.pause_client_trigger_request_select_sku_list_row, null);
            tvItemName = (TextView) vi.findViewById(R.id.list_row_ItemName);                
        } else {
            tvItemName = (TextView) vi.findViewById(R.id.list_row_ItemName);
        }

        hmap = new HashMap<String, String>();
        hmap = data.get(position);
        tvItemName.setText(hmap.get(KEY_ItemName));

    } catch (ProException ex) {
        Log.i(Tag, ex.getMessage());
    }

    return vi;
}

Now what I want is.

If there is an Exception which occurs in this try catch any Exception. It should be captured by my custom class (ProException). But its not allowing. Any help

Message in Java Eclipse Editor Unreachable catch block for ProException. This exception is never thrown from the try statement body

throw but How, I need to catch any exception which happens here. — MDMalik
– MDMalik, Commented Jun 3, 2013 at 10:22
@MDMalik I think you need to extend some Exception class which is being provided by Android and not an Exception(main java class). — Ketan Bhavsar
– Ketan Bhavsar, Commented Jun 3, 2013 at 10:23
@Ketan, All I want is my custom Exception class to handle any Exception which occurs. can't that be done. So that I could just ask my exception class to perform any action I require — MDMalik
– MDMalik, Commented Jun 3, 2013 at 10:27
@MDMalik see developer.android.com/reference/java/lang/Exception.html are recoverable exception handler being provided for android. If you think any of such exception will occur in your code. And you want your own implementation for same. You can extend that specific class instead Exception. — Ketan Bhavsar
– Ketan Bhavsar, Commented Jun 3, 2013 at 10:31

Ken Wolf · Accepted Answer · 2013-06-03 10:22:56Z

1

All those views don't know about your custom exception class. You have to extend/write your own View classes that throw your custom exception, or manually throw an exception within the try block.

throw new ProException();

answered Jun 3, 2013 at 10:22

Ken Wolf

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2 Comments

MDMalik Over a year ago

you mean. catch (Exception ex) {throw new ProException();} Is this what you mean, catch a general exception and throw it?

Ken Wolf Over a year ago

That would work although you would then need to surround that with a try/catch block too. You would basically rethrow any exception as your custom exception. Personally I think this would be too messy. I'm not sure what the benefit is so not sure what else to suggest.

Harish Kumar · Accepted Answer · 2013-06-03 10:58:30Z

0

MD please tell which call in the method getView can throw ProException. It seems none of the code in that method can throw ProException so you are getting "This exception is never thrown from the try statement body" and block not reachable. In order to use in try catch it should get the Proexception or you can catch Exception in try catch of getView and then wrap it in ProException.

Please see if this solves the issue.

answered Jun 3, 2013 at 10:58

Harish Kumar

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Comments

NFE · Accepted Answer · 2013-06-03 11:25:22Z

0

ProException is custom exception. when code block throw exception then it cann't able to catch because when you write any custom exception then hierarchy become

Exception->>ProException

if code block throw any exception, It will try to find out catch block of Exception instead of ProException. OR in simple term It will try to find out type of exception

So you have to catch Exception instead of ProException

Custom exception helpful whenever you throw somewhere it.

answered Jun 3, 2013 at 11:25

NFE

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Comments

Peter Crotty · Accepted Answer · 2013-06-04 13:16:04Z

I think what you want is

public View getView(int position, View convertView, ViewGroup parent) {
    View vi = convertView;
    try {
        if (convertView == null) {
            vi = inflater.inflate(R.layout.pause_client_trigger_request_select_sku_list_row, null);
            tvItemName = (TextView) vi.findViewById(R.id.list_row_ItemName);                
        } else {
            tvItemName = (TextView) vi.findViewById(R.id.list_row_ItemName);
        }

        hmap = new HashMap<String, String>();
        hmap = data.get(position);
        tvItemName.setText(hmap.get(KEY_ItemName));

    } catch (Exception ex) {
        Log.i(Tag, ex.getMessage());
        throw new ProException(ex.getMessage());
    }

    return vi;
}

Then the calling code can catch ProException. You should consider taking the causing exception as a constructor argument to ProException (then you can pass it to super(cause, message)).

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