Antwort: Re: Antwort: Java Exception question...

Ok!

I can not understand why code can throw a checked Exception not defined, 
but you can always replace java.lang.reflect.InvocationTargetException 
with "Exception". So every exception will be caught and there is no check.

Greetings from Austria

Ralf M Petter




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Re: Antwort: Java Exception question...






Ralf,

Thanks for the advice...however, when I put the try -> catch in my code, 
upon compilation I get the following error:

Exception java.lang.reflect.InvocationTargetException is never thrown in 
the body of the corresponding try statement.

so, i guess I can't catch it...

Shane Cessna 
iSeries Programmer
iSeries WAS Administrator
North American Lighting, Inc.
(618) 662-4483 x2776
shane_cessna@xxxxxxx 



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Antwort: Java Exception question...






Hm!

catching an exception is pretty easy. Give the code line which throws the 
exception into a try catch block. for example

try {
String targetFilename = imageDir + 
filename.substring(0, filename.lastIndexOf(".")) + i + ".jpg";
                                JAI.create("filestore", image, 
targetFilename, "JPEG");
}
catch(java.lang.reflect.InvocationTargetException e){
}

I think this will work, but is not best practice.

Greetings from Austria

Ralf M Petter




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Java Exception question...






I'm not sure if this is possible or not, but here goes.  I have a loop 
that converts multi-page TIF files to single page JPEG files...my problem 
comes when the program converts the first page of the TIF successfully 
then throws an exception 
(java.lang.reflect.InvocationTargetException)...is there any possible way 
to completely ignore this exception within my code?  I realize this might 
be taboo, but my method does what i want it to do before it hits this 
exception...here's my code:

import java.io.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.image.renderable.*;
import com.sun.media.jai.codec.*;
import javax.media.jai.*;

public class Tiff2JPEG {
        public static boolean doTiff2JPEG(String filename, String 
imageDir) {
                String sourceFilename = imageDir + filename;
                try {
                        FileSeekableStream stream = new 
FileSeekableStream(sourceFilename);
                        imageDecoder dec = 
ImageCodec.createImageDecoder("tiff", stream, null);
                        int numofpages = dec.getNumPages();
                        for (i = 0; i <= numofpages; i++) {
                                RenderedImage image = 
dec.decodeAsRenderedImage(i);
                                String targetFilename = imageDir + 
filename.substring(0, filename.lastIndexOf(".")) + i + ".jpg";
                                JAI.create("filestore", image, 
targetFilename, "JPEG");        // this creates the JPG successfully, then 



throws the exception...
                        }
                return true;
                } catch (IOException e) {
                        e.printStackTrace();
                        return false;
                }
        }
 
        public static void main(String args[]) {
                if (doTiff2JPEG("multicolor14pages.tif", "C:\test 
tiffs\")) {
                        System.out.println("JPG Creation Successful!");
                } else {
                        System.out.println("JPG Creation Unsuccessful!");
                }
        }
}

Shane