Is there a way to get the java file/line number?

Question

In C/C++ the filename is returned by FILE and line number is returned by LINE. Java does have a getFileName(), but does not seem to have a corresponding getLineNumber(). It would be nice to be able to do something like this:

catch (Exception e) {
    System.err.println(this.getFileName() + this.getLineNumber() + e.getMessage());
}

Actually, e.printStackTrace() is much more useful than getting filename and line number of where you *report* the error. — gawi, Sep 08 '10 at 16:28
Why does the JavaBeans IDE warn: "e.printStackTrace() should be removed?" — jacknad, Sep 08 '10 at 19:11

score 10 · Accepted Answer · answered Sep 08 '10 at 15:45

10

public static void main(String[] args)
{
    StackTraceElement frame = new Exception().getStackTrace()[0];
    System.out.println(frame.getFileName());
    System.out.println(frame.getLineNumber());
}

answered Sep 08 '10 at 15:45

gawi

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6

IMHO, it is better to do Thread.currentThread().getStackTrace() rather than constructing an Exception. Both are valid and working solutions though :) – Alain O'Dea Sep 08 '10 at 15:48
1

@Alain O'Dea I agree. I was not aware of/forgot about Thread.currentThread().getStackTrace() – gawi Sep 08 '10 at 16:21

score 3 · Answer 2 · answered Sep 08 '10 at 15:38

3

Use this:

http://download.oracle.com/javase/1.4.2/docs/api/java/lang/StackTraceElement.html

answered Sep 08 '10 at 15:38

gpeche

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Up to date link: http://download.oracle.com/javase/6/docs/api/java/lang/StackTraceElement.html – T.J. Crowder Sep 08 '10 at 15:46

Is there a way to get the java file/line number?

2 Answers2

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