为什么我的插件中的Webwork方法回落到JIRA的ActionSupport类中？

Question

I am having troubles with an Excel File uploaded into a Webwork Action class in my JIRA plugin. I am using apache.poi to manipulate the Excel file as follows:

public class ExcelWebworkAction extends JiraWebActionSupport
{
    private static final long serialVersionUID = -7589391189615316463L;
    private static final Logger log = LoggerFactory.getLogger(ExcelWebworkAction.class);

    @Override
    public String doExecute() throws Exception {
        MultiPartRequestWrapper wrapper = (MultiPartRequestWrapper)ServletActionContext.getRequest();
        File file = wrapper.getFile("fileField");
        FileInputStream filestrem = new FileInputStream(file.getPath());

        HSSFWorkbook workbook = null;

        try {
            workbook = new HSSFWorkbook(filestrem);
        } catch (IOException e) {
            e.printStackTrace();
        }

        HSSFSheet sheet = workbook.getSheetAt(0);
        Iterator<Row> rowIterator = sheet.iterator();
        while (rowIterator.hasNext()) {
            Row row = rowIterator.next();
            Iterator<Cell> cellIterator = row.cellIterator();
            while (cellIterator.hasNext()) {
                Cell cell = cellIterator.next();
            }
        }

        filestrem.close();

        return super.doExecute(); //returns SUCCESS
    }

}

When the code gets to the line:

workbook = new HSSFWorkbook(filestrem);

I am kicked out of the class to a class called ActionSupport from JIRA, but with no errors or stacktraces to guide me.

Am I missing something? It there something wrong? :(

Thanks in advance for any insights on this issue.

Answer 1

The underlying library is probably throwing some sort of unchecked exception. To debug, try changing:

catch (IOException e)

to:

catch (Throwable e)

and then set a breakpoint on the e.printStackTrace() line.

(Or wrap the whole method in the try/catch block if you're not 100% sure of exactly where it's crashing.)