Re: Jar extraction errors - Java Discussion Boards

Re: Jar extraction errors

Liam S. Crouch14-Jun-11 3:56

Liam S. Crouch

14-Jun-11 3:56

Not there? But the file is in the jar, so how can it not be there?

Re: Jar extraction errors

Nagy Vilmos14-Jun-11 4:03

Nagy Vilmos

14-Jun-11 4:03

The output file is not there.

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Re: Jar extraction errors

Liam S. Crouch14-Jun-11 4:04

Liam S. Crouch

14-Jun-11 4:04

Do you know how i fix that?

Re: Jar extraction errors

Nagy Vilmos14-Jun-11 4:13

Nagy Vilmos

14-Jun-11 4:13

Before opening the output stream check if it exists, if not then don't use append = true

Re: Jar extraction errors

Liam S. Crouch14-Jun-11 4:34

Liam S. Crouch

14-Jun-11 4:34

Still gives me the same error. Here is the new code:

BufferedOutputStream dest = null;<br />
		         FileInputStream fis = new <br />
			   FileInputStream(fName);<br />
		         JarInputStream zis = new <br />
		         JarInputStream(new BufferedInputStream(fis));<br />
		         ZipEntry entry;<br />
		         while((entry = zis.getNextEntry()) != null) {<br />
		            int count;<br />
		            byte data[] = new byte[BUFFER];<br />
		            // write the files to the disk<br />
		            File theFile = new File(Util.getWorkingDirectory().getAbsoluteFile() + "/bin/temp/" + entry.getName());<br />
		            FileOutputStream fos = null;<br />
		            if(theFile.exists())<br />
		            {<br />
		            	fos = new FileOutputStream(Util.getWorkingDirectory().getAbsoluteFile() + "/bin/temp/" + entry.getName(), true);<br />
		            }<br />
		            else<br />
		            {<br />
		            	fos = new FileOutputStream(Util.getWorkingDirectory().getAbsoluteFile() + "/bin/temp/" + entry.getName());<br />
		            }<br />
		           <br />
		            dest = new <br />
		              BufferedOutputStream(fos, BUFFER);<br />
		            while ((count = zis.read(data, 0, BUFFER)) <br />
		              != -1) {<br />
		               dest.write(data, 0, count);<br />
		            }<br />
		            dest.flush();<br />
		            dest.close();<br />
		         }<br />
		         zis.close();

Re: Jar extraction errors

Nagy Vilmos14-Jun-11 4:38

Nagy Vilmos

14-Jun-11 4:38

Can you please use <pre> tags for multiline code; there is an edit button for your message.

Re: Jar extraction errors

Nagy Vilmos14-Jun-11 4:44

Nagy Vilmos

14-Jun-11 4:44

The lines:

Java

if(theFile.exists())
{
    fos = new FileOutputStream(Util.getWorkingDirectory().getAbsoluteFile() + "/bin/temp/" + entry.getName(), true);
}
else
{
    fos = new FileOutputStream(Util.getWorkingDirectory().getAbsoluteFile() + "/bin/temp/" + entry.getName());
}

Can be written:

fos = new FileOutputStream(
            Util.getWorkingDirectory().getAbsoluteFile() + "/bin/temp/" + entry.getName(),
            theFile.exists());

That's readable.

Now, check if the file exists, if it doesn't [which I suspect], is the directory name valid? Is the file name valid? Do you have access to write to the location? This is called debugging and the programmer is expected to do this. The more information you can provide, the easier it is for us to help. Right now, I can offer little more than general tips; even if they are bloody good ones.

Re: Jar extraction errors

Liam S. Crouch14-Jun-11 5:06

Liam S. Crouch

14-Jun-11 5:06

I added a specific folder to add the contents to. Now i get a FileNotFoundException (No suck File or directory):

java.io.FileNotFoundException: /home/petterroea/.minecraft/bin/temp/META-INF/MOJANG_C.SF (No such file or directory)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:209)
at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
...

The line that is not working, is

fos = new FileOutputStream(
		                    Util.getWorkingDirectory().getAbsoluteFile() + "/bin/temp/" + entry.getName(),
		                    theFile.exists());

The folder /home/petterroea/.minecraft/bin/temp/ exists, but there is no content in it

Re: Jar extraction errors

Nagy Vilmos14-Jun-11 5:14

Nagy Vilmos

14-Jun-11 5:14

The exception is even telling you what's wrong:

Member 7991625 wrote:
java.io.FileNotFoundException: /home/petterroea/.minecraft/bin/temp/META-INF/MOJANG_C.SF (No such file or directory)

File /home/petterroea/.minecraft/bin/temp/META-INF/MOJANG_C.SF is the problem, you need to create the folder /home/petterroea/.minecraft/bin/temp/META-INF before you can add anything to it...

Re: Jar extraction errors

Liam S. Crouch14-Jun-11 5:18

Liam S. Crouch

14-Jun-11 5:18

How do i do that dynamically with multiple folders? I am thinking of something like removing /home/petterroea/.minecraft/bin/temp/

And splitting the rest by /

Then loop through the parent's contents to see if the folder exists...

Re: Jar extraction errors

Nagy Vilmos14-Jun-11 5:25

Nagy Vilmos

14-Jun-11 5:25

You should be able to use theFile.mkdirs().

Re: Jar extraction errors

Liam S. Crouch14-Jun-11 5:32

Liam S. Crouch

14-Jun-11 5:32

I got the (Is a directory) error. How do i remove the file's name and only use the paths?

Re: Jar extraction errors

Nagy Vilmos14-Jun-11 5:51

Nagy Vilmos

14-Jun-11 5:51

Try theFile.getAbsoluteFile().mkdirs()

Debug information not present in the .class file..

Indrojeet9-Jun-11 18:49

Indrojeet

9-Jun-11 18:49

I have compiled a java file but it does not have debug level information as LineNumberTable and LocalVariableTable , because of which my log file is not getting generated.

I want to know how can we have the debug information in the class file?
Any help !!

Re: Debug information not present in the .class file..

Peter_in_27809-Jun-11 19:15

Peter_in_2780

9-Jun-11 19:15

You need to tell your compiler to generate the debug information. Exactly how to do this depends on what development environment you are using. Here's how to do it in Eclipse (and it's probably pretty similar in other IDEs):
Project > Properties > Java Compiler > Classfile Generation
There are a number of checkboxes, including three you want. Check them and rebuild. Easy.
If you're using a standalone compiler, it will have command line switches. Run it with -? to see what they are.

Cheers,
Peter

Software rusts. Simon Stephenson, ca 1994.

Re: Debug information not present in the .class file..

Indrojeet9-Jun-11 20:28

Indrojeet

9-Jun-11 20:28

Thanks for your reply Peter.

But the problem is not at IDE Level, I am tring to run a ANT script which is running on jdk 1.6 and generates a JAR file, when I see the class file it does not contain the debug level information(I am not running the ANT file from IDE , I have a Dmake file which calls the ANT script).

As per my understanding when the compiler compiles a java file, it puts the debug information in the class file, but they are missing in the class file.

Can it be because of some JVM or compiler setting??

Re: Debug information not present in the .class file..

Peter_in_27809-Jun-11 20:43

Peter_in_2780

9-Jun-11 20:43

Indrojeet wrote:
Can it be because of some JVM or compiler setting??

Yes - a compiler setting, as I indicated in my previous reply. This is a cut'n'paste from javac.html - the docco for the javac compiler, which is probably what you are using.

-g
    Generate all debugging information, including local variables. By default, only line number and source file information is generated. 
-g:none
    Do not generate any debugging information.
-g:{keyword list}
    Generate only some kinds of debugging information, specified by a comma separated list of keywords. Valid keywords are:

    source
        Source file debugging information
    lines
        Line number debugging information
    vars
        Local variable debugging information

Looks like you have -g:none in an ANT buildfile or somewhere. Go find it and fix!

Cheers,
Peter

Software rusts. Simon Stephenson, ca 1994.

Re: Debug information not present in the .class file..

Indrojeet9-Jun-11 20:54

Indrojeet

9-Jun-11 20:54

the current javac looks like this

<javac srcdir="${src}" destdir="${dest}">
<classpath refid="classpath" />
</javac>

Can you tell me how to include this -g in this ant script?

Re: Debug information not present in the .class file..

Peter_in_27809-Jun-11 21:22

Peter_in_2780

9-Jun-11 21:22

Sorry, I can't help you with this one, as I don't know my way around ANT. With any luck, someone who does know will see this thread and pick up from here. Maybe ask in another forum.

Good luck!
Peter

Software rusts. Simon Stephenson, ca 1994.

Re: Debug information not present in the .class file..

Indrojeet9-Jun-11 21:25

Indrojeet

9-Jun-11 21:25

Hey Peter , i got the fix

added a attribute, debug="on"

Thanks

.jar File operations

Liam S. Crouch8-Jun-11 19:53

Liam S. Crouch

8-Jun-11 19:53

Hi
I wondered how i could:

1. Check if a file in a .jar file exists
2. Delete files from a .jar
3. add files to a .jar
4. Delete folders from a .jar

I can't find any documentation on this by searching!

Re: .jar File operations

Peter_in_27808-Jun-11 20:45

Peter_in_2780

8-Jun-11 20:45

You can't have looked very hard. Frown | :(

Googling "jar file format" gave me almost 4.5 million results, the first one of which is this Wikipedia entry[^].
As it says, a jar file is basically a zip file with some descriptive stuff in a file called META-INF\MANIFEST.MF. So, grab your favourite zip tool and text editor and go for it.

Peter

Software rusts. Simon Stephenson, ca 1994.

Re: .jar File operations

Liam S. Crouch13-Jun-11 8:43

Liam S. Crouch

13-Jun-11 8:43

When i try, i get a java.io.FileNotFoundException: META-INF/XXXXXX_X.SF (No such file or directory)

Re: .jar File operations

Richard MacCutchan8-Jun-11 21:49