Rethrow an exception from a multi-catch block

Question

Similar to Multiple exception catch block java 8 eclipse SO question, I have the same issue. The referenced question does not really provide a solution, though.

In a JAX-RS web service, I am trying to build a stream. Inside the stream, I am running a query and will write the results to the stream.

Here is my working code:

public StreamingOutput getExportData (int year_mo, String plant, String reqType, String payType) {
    StreamingOutput stream = new StreamingOutput() {

        @Override
        public void write (OutputStream output) throws IOException, WebApplicationException {

            PrintWriter out = new PrintWriter(new OutputStreamWriter(output));

            ...

            try (AdbDao dao = new AdbDao();) {
                ResultSet rs = dao.getExportData(year_mo, plant, reqType, payType);

                ...

               if (rs != null) {
                    while (rs.next()) {
                        ...
                    }
                }
            } catch (JSONException | SQLException e) {
                e.printStackTrace();
                throw e; <-- This is the issue
            }

            output.flush();
            output.close();
        }
    };

    return stream;
}

The throw e; produces the message Unhandled exception type SQLException

What do I need to do to be able to throw the exception back to my web app?

If you don't want an SQLException to be thrown, what else do you want to be thrown? — Thomas Weller, Jul 25 '19 at 20:40
Side note: IMHO, you should really have a `finally` block for the `.flush()` and `.close()`. — Thomas Weller, Jul 25 '19 at 20:41
An `SQLException` is a checked exception, that means that if you throw it, you must declare it to be thrown using the `throws` clause. You're throwing the `SQLException` within the `write` method, but this method does not declare an `SQLException` to be thrown. That's why you can't do this. Either wrap your exception in an unchecked exception, or within one of `IOException` or `WebApplicationException`. — MC Emperor, Jul 25 '19 at 20:42

Antoniossss · Accepted Answer · 2019-07-25T21:15:39.383

0

You need to either

declare your method throws SQLException
handle it in catch block (and dont rethrow it)
or wrap it in eg RuntimeException and throw that - or any other exception that suits your needs.

edited Jul 25 '19 at 21:15

answered Jul 25 '19 at 21:09

Antoniossss

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Rethrow an exception from a multi-catch block

1 Answers1