how to select root cause of exception from nested exception

hi all,

i am getting fileNotFound exception while attaching a file with message

java.sendMailException

-- nested exception java.io exception

-- nested exception java.io.fileNotFoundException

i want to select root cause of exception i.e. FileNotFoundException can you please tell me how to select that one

please reply

Thanks,
-Ravi

Check out the API documentation for Throwable. You will find methods which will give you the cause.

Thanks for reply,

but m still not getting solution.

i tried for getCause() and getRootCause() for that one but it is returning null

can you please explain in brief.

Thanks,
-Ravi.

ravi pardeshi wrote:
but m still not getting solution.

Please use real words

Why don't you post your code so we can figure out what's going wrong

Doesn't it appear in the stack trace?

Maneesh Godbole wrote:

ravi pardeshi wrote:
but m still not getting solution.

Please use real words

Why don't you post your code so we can figure out what's going wrong

public boolean sendMail(String fromMsg,String toSend,String subject,String msg,List locationVec)
	{
		boolean mailSend=true;
		MimeMessage message=javaMailSender.createMimeMessage();
		try
		{
			MimeMessageHelper helper = new MimeMessageHelper(message, true);
				helper.setTo("test@gmail.com");
			if(msg !=null)
				helper.setText(msg,true);
			else
				helper.setText("    abcd ", true);
			
				helper.setFrom("ravi@gmail.com"); 
				
			helper.setSubject(subject);
				if(locationVec!=null && locationVec.size()>0)
				{
					FileSystemResource []file=new FileSystemResource[locationVec.size()];
					for (int i=0;i<locationVec.size();i++)
					{
						String str="";
						str=(String)locationVec.get(i);
						file[i] = new FileSystemResource(new File(str));
						if(file[i]!=null)
						{
							helper.addAttachment(file[i].getFilename(), file[i]);
						}
					}
				}
		javaMailSender.send(message);
		}
		catch(MailSendException ex)
		{
			System.out.println("mailex -->"+ex);

String cause = ex.getMessage();  
			System.out.println("cause -->"+cause);
			LogMessage.debug("Exception occured while sending the mail : " + ex);
			LogMessage.debug("Email has not been sent due to one of these reasons : 1)Invalid email address 2)Attachments in mail may not be found  and 3)Connection problem.");
			mailSend =false;
			
		}

if the attachment not exists then it is throwing exception

I don't see any getCause() in your code.

get cause returning null in that method so i changed that one to getMessage()

If it returned null there probably was no cause to print.

then how come i will show exact problem to user ?
i.e. file not found at specific location

output

ravi pardeshi wrote:then how come i will show exact problem to user ?
i.e. file not found at specific location

If getCause() returns null, then basically it means that, as far as the exception is concerned, it is the root cause. It may not be, but then the programmer forgot to set the cause and you can never retrieve it anymore.

This line

calls the toString() method on your ex object.
If you look at the source code for the org.springframework.mail.MailSendException class, you can see how toString gets its list of nexted exceptions and then do the same yourself.

OK ...

thanks for response.