Couple more questions on JAR Files :S

[Lil_Aziz1]

Many apologies if it seems like I'm spamming the forums. I just seem to stumble upon many questions and there are always some questions that google cannot answer (or I suck at googl'ing). Anyhow, these are my questions:

1. Signing JAR files ( Signing JAR Files (The Java™ Tutorials > Deployment > Packaging Programs in JAR Files) ) What type of extension does the .keystore file need? What format is used to store the storepass and keypass in the .keystore file? Does it need headers like the manifest file? An example would suffice ;)

2. So I made my package into a JAR file. The container (JFrame) has an image instead of the JAVA coffee symbol by the title (used BufferedImage). Think it would be better explained by displaying the code:

 
package sudoku;
public class SudokuFrame extends JFrame {
     ....
     
     public SudokuFrame() {
            this.setIcon(getIcon());
            ....
     }

      	public BufferedImage getIcon() {
		BufferedImage sudokuIcon = null;
		try {
		    sudokuIcon = ImageIO.read(new File("sudoku\\aziz_icon.png"));
		} 
		catch (IOException e) {}
		return sudokuIcon;
	}
       .....

When I do java -jar SudokuJar.jar in cmd, the custom icon is displayed! But, when I make a project in Eclipse, go to properties (for that project) > Java Build Path > Add External Jars > SudokuJar.jar, make a driver program with the following content:

import sudoku.SudokuWorld;

public class test {
	public static void main (String[] args) {
		SudokuWorld test = new SudokuWorld();
		test.display();
	}
}

THE ICON IS GONE! (Application is still displayed btw) I'm thinking the location of the image changed. If so, where to? And how can I make the icon display in the eclipse driver program? If not, I would still like to know what's wrong lol.

Thanks in advance.

[Webuser]

You cannot use java.io.File lib with unsigned applet ;)

the code shouldn't actually work in your browser sandbox ;)

I mean this code block

public BufferedImage getIcon() {
		BufferedImage sudokuIcon = null;
		try {
		    sudokuIcon = ImageIO.read(new File("sudoku\\aziz_icon.png"));
		} 
		catch (IOException e) {}
		return sudokuIcon;
	}

P.S> I dearly hope I understood the question...

[Lil_Aziz1]

Sorry about any ambiguity in question #2. Let me try again:

My java application has one package, called sudoku. I converted my package into a JAR file (it is unsigned at the moment) called SudokuJar.jar. The JAR file also has a Main-Class called DriverProgram. The manifest file DOES contain this header:

Main-Class: sudoku.DriverProgram

Now when I run the jar file in CMD with the following command:

java -jar SudokuJar.jar

The getIcon() method returns aziz_icon.png. I can tell because the JAVA symbol on the top left corner was replaced by aziz_icon.png.

Next, I made a new java project called TestProject in Eclipse. I added the JAR file SudokuJar.jar by doing the following:

 Right click on TestProject > Properties > Java Build Path (on the left side) > Add External JARs.. 
      (on the ride side) > Locate SudokuJar.jar > Open > OK

Then, I made a driver program in TestProject called test. The content of test is in the first post. When I run test, the java symbol on the top left corner is still there; consequently aziz_icon.png is not there.

What's wrong?

Thanks in advance.

[Webuser]

to add any images you have to use an anchor class. As a rule it is a.class and place it into images project package
So then you can simply ref your app with this image as

import images;
...
Image image=ImageIO.read(a.class.getResourceAsStream("image.PNG"));

I recommend to read
this How to Use Icons (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components)
this ImageIO (Java Platform SE 6)
and this Reading/Loading an Image (The Java™ Tutorials > 2D Graphics > Working with Images)

P.S. Study to use Google, pal ;)

[JosAH]

to add any images you have to use an anchor class. As a rule it is a.class and place it into images project package

That is just a silly hack. You can load anything in a .jar you want given either a relative path; relative to some class or an absolute path. Read the API documentation for, e.g. the getResourceAsStream( ... ) method.

kind regards,

Jos

[Norm]

in Eclipse

SO the program works ok outside of Eclipse when you execute it from a command prompt but fails when in Eclipse? Recommendation: Don't use Eclipse to execute it.

Can you add some debug code to the app to see where it is looking for the image. I'm sure Eclipse uses directories differently than you expect.

BTW Java applications don't need permission to access things on a system. Signing is for browser loaded applets that want to access things.

[Webuser]

That is just a silly hack. You can load anything in a .jar you want given either a relative path; relative to some class or an

It is not a hack at all :rolleyes: It is a simplest way to ref a resource within a jar file...

As I was saying, that is how

InputStream in=a.class.getResourceAsStream("image.PNG"));

the boy can get an inner jar resource file stream :) It's simply :D

[JosAH]

It is not a hack at all :rolleyes: It is a simplest way to ref a resource within a jar file...

The simplest way?

As I was saying, that is how

InputStream in=a.class.getResourceAsStream("image.PNG"));

the boy can get an inner jar resource file stream :) It's simply :D

The boy?

Jos

[StormyWaters]

Why do you even need the a.class? I've always used this.getClass().getResourceAsStream(path) where path is the path to the file in the jar file.

[Webuser]

Why do you even need the a.class? I've always used this.getClass().getResourceAsStream(path) where path is the path to the file in the jar file.

Oh my...
Not to use this

getResourceAsStream(path)

but simply to import needed package ;)
But you can do as you wish :rolleyes:

[Webuser]

The boy?

Jos

The girl? :rolleyes:

[JosAH]

Oh my...
Not to use this but simply to import needed package ;)
But you can do as you wish :rolleyes:

Show us the code you are using (without the getResourceAsStream( ... ) call mayhap? just importing a package?)

Jos

[StormyWaters]

I guess I could see how it could be useful if the image folder is moved somewhere as you wouldn't need to update all the paths to the Images, but rather just the import statement to the a.class, however I usually just have a folder dubbed images which I dump them all into.

[JosAH]

The girl? :rolleyes:

The term "boy" is very denigrating and even has a racist connotation in some cultures.

Jos